Pesticides and biocides are widely used in agriculture, building materials, and urban gardening to control pests and protect crops and public health. While much attention has been paid to pesticide residues in food, water, and outdoor environments, far less is known about their presence inside homes, where people spend the majority of their time. A new RECETOX study published in Indoor Environments addresses this gap by examining pesticides detected in house dust and their relevance for human exposure.&nbsp;The study reveals that Czech household dust commonly contains multiple pesticide residues, highlighting the persistence of both historic and current chemical use indoors. Modern pesticides were detected in 93% of homes, with two fungicides (carbendazim and propiconazole) most frequently found, while compounds related to the long‑banned pesticide DDT were present in dust from all homes, and were at higher levels in homes over 40 years old. Homes located closer to agricultural areas showed higher levels of current‑use pesticides in spring, indicating an influence of nearby farming activities. &nbsp;House dust acts as a sink for chemicals transported indoors from outdoor sources as well as from indoor use. Many pesticides can persist in dust for long periods, leading to continuous exposure in indoor spaces. This is particularly important for young children, who have higher exposure to dust from playing on the floor and mouthing toys and objects. The research underscores that indoor environments are not isolated from their surroundings. Understanding what ends up in house dust is a crucial step toward protecting public health and developing more comprehensive approaches to managing chemical risks in everyday life.&nbsp;<img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/RECETOX_Vyzkum_pesticidu_v_domacim_prachu_opomijena_cesta_lidske_expozice_a9a089fd2f.jpg" alt="RECETOX: Pesticides in House Dust: An Overlooked Pathway of Human Exposure" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_RECETOX_Vyzkum_pesticidu_v_domacim_prachu_opomijena_cesta_lidske_expozice_a9a089fd2f.jpg 195w," sizes="100vw" width="738" height="591"><blockquote><h4>Original Article</h4><h4><a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S2950362026000214?via%3Dihub">Legacy and current-use pesticides in indoor settled dust and association with building age and seasonality</a></h4>Paula Marcinekova, Ondřej Mikeš, Simona Rozárka Jílková, Petr Šenk, Jakub Martiník, Jan Böhm, Petra Borilova Linhartova, Lenka Andrýsková, Jana Klánová, Lisa MelymukIndoor Environ., 2026, 3, 100169<a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1016/j.indenv.2026.100169">https://doi.org/10.1016/j.indenv.2026.100169</a>&nbsp;<h6>licensed under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/">CC-BY 4.0</a></h6></blockquote><h4>Abstract</h4>Indoor pesticide exposure is increasingly recognized as a significant contributor to pollutant exposure in residential spaces. This study investigates concentrations of legacy organochlorine pesticides (OCPs) and current-use pesticides (CUPs) in settled dust from 116 homes in the Czech Republic, in the context of their seasonal variability, relationships with building characteristics, geospatial factors, and indoor dust bacteriome diversity and composition. CUPs were detected in dust in 93% of homes, with carbendazim (84.5%), propiconazole (49.1%), atrazine (24.1%), and tebuconazole (11.2%) detected most frequently. OCPs were found in all homes. Propiconazole concentrations were significantly higher in homes with adjacent gardens, potentially reflecting its use as a biocide in outdoor building materials. CUP concentrations had clear seasonal trends, with peak levels in spring and summer, corresponding to pesticide application periods, particularly in rural environments. OCP concentrations were substantially higher in houses over 40 years old, indicating the persistence of residues from past indoor uses. While pesticide presence was ubiquitous, exposure estimates for children, under both average and high-exposure scenarios, were well below U.S. EPA reference doses (RfDs) for individual compounds; however, most homes had 3–11 pesticides in dust, raising the possibility of mixture effects. No significant associations, using a Spearman rank correlation matrix, were observed between pesticide concentrations and indoor dust bacteriome diversity and composition. These findings highlight the presence of pesticides in homes, including those in urban areas, driven by both current and historical sources, and reinforce the importance of monitoring to better understand potential exposure pathways.<h4>Instrumentation</h4><h5>1. LC–MS/MS analysis of CUPs</h5><ul><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/library?instrumentationItems=27&amp;mainauthorItems=10&amp;search=1290+Series+Gradient">Agilent 1290 Series Gradient HPLC</a></li><li>Columns:<ul><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1701">Phenomenex Luna C18</a></li><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/library?instrumentationItems=34&amp;mainauthorItems=50&amp;search=SecurityGuard+C18">Phenomenex SecurityGuard C18</a></li></ul></li><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/library?mainauthorItems=55&amp;search=QTrap+5500%2B">SCIEX QTrap 5500+</a> (triple quadrupole MS, ESI+)</li></ul><h5>2. GC–MS/MS analysis of OCPs</h5><ul><li><a target="_blank" rel="noopener noreferrer" href="https://gcms.labrulez.com/library?instrumentationItems=1&amp;mainauthorItems=10&amp;search=8890A">Agilent 8890A GC</a></li><li><a target="_blank" rel="noopener noreferrer" href="https://gcms.labrulez.com/library?instrumentationItems=19&amp;mainauthorItems=7&amp;search=Rxi-5Sil-MS">Restek Rxi-5Sil-MS capillary column</a></li><li><a target="_blank" rel="noopener noreferrer" href="https://gcms.labrulez.com/library?mainauthorItems=10&amp;search=7000D">Agilent 7000D triple quadrupole MS</a></li></ul>

Pesticides in House Dust: An Overlooked Pathway of Human Exposure

This technical note presents a practical troubleshooting strategy for one of the most common issues in liquid chromatography (LC): shifting retention times. The approach is based on a systematic distinction between system-related (physical) and chromatographic (chemical) causes.A key diagnostic parameter used throughout the process is the T₀ (dead time), representing an unretained peak that passes through the column without interaction.<h3>Key Concept: T₀ (Dead Time / Unretained Peak)</h3>T₀ is defined as the retention time of a compound that does not interact with the stationary phase and therefore elutes directly with the mobile phase.<h4>How to Determine T₀</h4>T₀ can be determined experimentally by adding a marker compound to the system:<ul><li>Uracil</li><li>Potassium nitrate</li></ul>These compounds are added to a blank or method and produce a measurable unretained peak used for troubleshooting.<h3>Step 1: Evaluate T₀ Behavior</h3>The first and most important step is to determine whether T₀ is constant or variable.<ul><li>Case A: T₀ is Variable (Shifting) → Indicates a system-related (physical) problem &nbsp;</li><li>Case B: T₀ is Constant → Indicates a chromatographic or chemical problem</li></ul><h3>System-Related Issues (T₀ is Variable)</h3>If T₀ is shifting, the problem is likely related to the LC system hardware or physical parameters. This is especially true when all peaks shift together in the chromatogram.<h3>Possible Causes</h3><ul><li>Incorrect Flow Rate</li><li>Pump Malfunction<ul><li>Inconsistent or unstable flow delivery can cause retention time variability.</li></ul></li><li>Incorrect Column Length<ul><li>Using a column with different dimensions than expected.</li></ul></li><li>Solvent Delivery Issues<ul><li>Empty solvent reservoir (system running dry)</li><li>Blockages or restrictions (e.g., frits, solvent lines)</li></ul></li><li>Tubing or System Volume Changes<ul><li>Changes in tubing configuration</li><li>Differences in system dwell (swell) volume</li></ul></li></ul><h3>Chromatographic / Chemical Issues (T₀ is Constant)</h3>If T₀ remains stable but only specific peaks shift, the issue is likely related to chemistry or column conditions.<h4>Possible Causes</h4><ul><li>Incorrect Stationary Phase<ul><li>Column with same dimensions but different chemistry (e.g., different silica or bonded phase)</li></ul></li><li>Ionizable Analytes Ionizable compounds exist in:<ul><li>Neutral form - More hydrophobic, retained longer on a reversed-phase column</li><li>Ionized form</li></ul>Impact of pH Small pH changes in the mobile phase can significantly affect:<ul><li>Ionization state</li><li>Retention time of specific analytes</li></ul></li><li>Mobile Phase Issues<ul><li>Old solvents</li><li>Evaporation of volatile components</li><li>Changes in composition</li></ul></li><li>4. Temperature Variations<ul><li>Temperature affects analyte–stationary phase interactions</li><li>Even small fluctuations can shift retention times</li></ul></li></ul><h3>Step-by-Step Troubleshooting Workflow</h3><ol><li>Add T₀ Marker<ol><li>Use uracil or potassium nitrate</li></ol></li><li>Monitor T₀<ol><li>Determine whether it is constant or shifting</li></ol></li><li>If T₀ is Variable → Check System<ol><li>Flow rate settings</li><li>Pump performance</li><li>Solvent levels and lines</li><li>Column dimensions</li><li>Tubing and system volume</li></ol></li><li>If T₀ is Constant → Check Chemistry<ol><li>Column phase</li><li>Mobile phase composition and pH</li><li>Solvent quality</li><li>Temperature stability</li><li>Nature of analytes (ionizable vs. non-ionizable)</li></ol></li></ol><h3>Discussion and Practical Insight</h3>This troubleshooting approach simplifies a complex problem by dividing it into two main categories:<ul><li>Physical/system-related</li><li>Chemical/chromatographic</li></ul>The use of T₀ as a diagnostic tool allows rapid identification of the problem origin, reducing unnecessary trial-and-error steps.Particular attention should be paid to ionizable compounds, as they are highly sensitive to pH variations, which can lead to significant and selective retention time shifts.<h3>Conclusion</h3>Retention time shifts in LC can be efficiently diagnosed by evaluating the behavior of the T₀ (unretained peak):<ul><li>Variable T₀ → System issue</li><li>Constant T₀ → Chromatographic/chemical issue</li></ul>By following this structured approach, analysts can quickly narrow down the root cause and implement targeted corrective actions.

Troubleshooting Retention Time Shifts in Liquid Chromatography 

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RECETOX (Research Centre for Toxic Compounds in the Environment) is an independent department of the Faculty of Science of Masaryk University in Brno, which has been established in 1983. RECETOX is focused on the research and education in cross-cutting area of Environment and Health. It addresses interactions among chemicals, environment, and biological systems, including consequences at local, regional, and global levels.

RECETOX - Centrum pro výzkum toxických látek v prostředí

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Thermo Scientific Dionex IonPac AS10 IC Columns

Analyze trace-levels of inorganic anions and organic acids using isocratic or gradient methods with the Thermo Scientific™ Dionex™ IonPac™ AS10 IC Column.

Analyze trace-levels of inorganic anions and organic acids using isocratic or gradient methods with the Thermo Scientific™ Dionex™ IonPac™ AS10 IC Column. Its high capacity permits the analysis of trace-level analytes in high-ionic-strength matrices. Use the Dionex IonPac AS10 column for the analysis of inorganic anions in high nitrate samples.<h5>Superior Chromatographic Performance in High Nitrate Samples</h5><ul><li>Excellent resolution of weakly retained low-molecular-weight aliphatic acids</li><li>Selectivity and high capacity for analysis of trace-level analytes in high-ionic-strength matrices</li><li>Strongly retains nitrate for high-resolution analysis of trace anions in nitric acid and nitrate salts</li></ul><h5>For Best Results</h5><ul><li>Use a Dionex eluent generator for simplified eluent preparation for applications using less than 100mN hydroxide</li><li>Use the Thermo Scientific™ Dionex™ Anion Self-Regenerating Suppressor (ASRS™ 300) with the Dionex IonPac AS10 column for continuous suppression of traditional eluents and more concentrated eluents up to 200mM NaOH</li></ul><h4>Specifications</h4><ul><li>Crosslinking: 55% DVB</li><li>Column Capacity: 170 μeq</li><li>Column Chemistry: Hydroxide</li><li>For Use With (Application): Separation of Inorganic Anions and Organic Acids</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS10</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li><li>pH: 0 to 14</li></ul>

Thermo Scientific Dionex IonPac AS11 IC Columns

Resolve a large number of inorganic anions and organic acids in approximately 15 minutes with the Thermo Scientific Dionex IonPac AS11 Analytical & Guard Column. 

Resolve a large number of inorganic anions and organic acids in approximately 15 minutes with the Thermo Scientific™ Dionex™ IonPac™ AS11 Analytical &amp; Guard Column. The Dionex IonPac AS11 is a relatively low-capacity column designed for fast gradient screening of inorganic anions and organic acid anions in simple sample matrices such as from foods, beverages, chemical process solutions, wastewaters, brines, and power plant waters.<h5>Superior Chromatographic Performance:</h5><ul><li>Facilitates rapid analysis of organic acids and inorganic anions in well-characterized samples</li><li>Ideal for highly charged anions, including polyphosphates and polycarboxylates</li><li>Resolves organic acids and inorganic anions in complex sample matrices</li><li>Shortens analysis time and speeds throughput</li></ul><h4>Specifications</h4><ul><li>Anion Exchange Capacity: 45 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 45 μeq</li><li>Column Chemistry: Hydroxide</li><li>For Use With (Application): Analysis of Inorganic and Organic Acid Anions</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS11</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li><li>pH: 0 to 14</li></ul>

Thermo Scientific Dionex IonPac AS12A IC Columns

Thermo Scientific Dionex IonPac AS12A Analytical and Guard Columns resolve trace chloride and sulfate in high-carbonate samples

Separate inorganic anions and oxyhalides, such as chlorite and bromate, in environmental samples. The Thermo Scientific™ Dionex™ IonPac™ AS12A Analytical and Guard Columns resolve trace chloride and sulfate in high-carbonate samples and meet or exceed the requirements of U.S EPA Methods 300.0 (A) and (B). However, the advanced, high-capacity IonPac AS23 Carbonate Eluent Anion-Exchange column is recommended for determination of oxyhalides and inorganic anions, such as trace bromate, in ozonated drinking water.<h5>Fast Isocratic Separation of Inorganic Anions and Oxyhalides in Diverse Matrices</h5><ul><li>Compliance monitoring of common anions in drinking water as specified in U.S. EPA Method 300.0 (A) and (B)</li><li>Separation of common inorganic anions and oxyhalides including chlorite, bromate and chlorate in less than 12 minutes</li><li>Superior retention and quantification of fluoride</li><li>Trace analysis of chloride and sulfate in high-carbonate samples</li><li>Solvent compatibility permits easy column cleanup after the analysis of samples with hydrophobic components.</li></ul><h5>Multiple Formats Available for Application Flexibility</h5><ul><li>4x200mm, 2x200mm analytical columns</li><li>4x50mm, 2x50mm guard columns</li><li>Longer 200mm columns facilitate higher resolution separations of more complex sample matrices</li><li>Smaller i.d. columns provide higher mass sensitivity, eluent and reagent conservation and lower operating costs</li></ul><h4>Specifications</h4><ul><li>Anion Exchange Capacity: 52 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 52 μeq</li><li>Column Chemistry: Carbonate/Bicarbonate</li><li>For Use With (Application): Separation of Inorganic Anions</li><li>Ion Exchange Group: Alkyl Quaternary Ammonium</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS12A</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS11-HC IC Columns

Resolve a large number of inorganic anions and organic acid anions in complex matrices with the Thermo Scientific Dionex IonPac AS11-HC Capillary, Analytical & Guard Column.

Resolve a large number of inorganic anions and organic acid anions in complex matrices with the Thermo Scientific™ Dionex™ IonPac™ AS11-HC Capillary, Analytical &amp; Guard Column. Complex sample matrices such as chemical wastewater effluents and fermentation broth solutions contain a variety of inorganic anions and organic acids. With the high-capacity Dionex IonPac AS11-HC column, you can inject higher concentration samples without column overloading or peak broadening.The Dionex IonPac AS11-HC column was specifically designed to resolve analytes in a single run using a hydroxide gradient. The high-capacity column delivers improved separation for monovalent carboxylic acids including: quinate, lactate, acetate, propionate, formate, and butyrate.<h5>High Capacity for Higher Resolution</h5><ul><li>Requires longer retention times, but with higher resolution</li><li>Facilitates rapid analysis of organic acids and anions in well-characterized samples</li><li>Ideal for organic acids and anions in complex sample matrices or uncharacterized samples</li><li>Recommended for monovalent and divalent organic acids</li></ul><h5>Reduce Operating Costs With Lower Eluent Requirements</h5>The new Dionex IonPac AS11-HC Capillary column is packed with the same material as the equivalent standard bore and microbore versions (providing the same performance as a 4mm and 2mm column) using only 1% of the eluent flow rate, which helps reduce operating costs.Use the Thermo Scientific™ Dionex™ IonPac™ ICE-AS1 or ICE-AS6 columns for organic acids in high-ionic-strength samples.<h4>Specifications</h4><ul><li>Anion Exchange Capacity: 290 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 290 μeq</li><li>Column Chemistry: Hydroxide</li><li>For Use With (Application): Anion Exchange</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS11-HC</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS14 IC Columns

Deliver excellent results for fast isocratic separations of inorganic anions in diverse matrices with the Thermo Scientific Dionex IonPac AS14 Carbon Eluent Anion-Exchange Column.

Deliver excellent results for fast isocratic separations of inorganic anions in diverse matrices with the Thermo Scientific™ Dionex™ IonPac™ AS14 Carbon Eluent Anion-Exchange Column. This universal column for the separation of inorganic anions delivers improved peak resolution and retention of fluoride in applications performed previously with the Dionex IonPac AS4A, AS4A-SC and AS12A columns, however, the Dionex IonPac AS22 Carbonate Eluent Anion-Exchange column, an advanced carbonate eluent column, is recommended for fast analysis of inorganic anions.<h5>Fast Separation of Inorganic Anions in Diverse Matrices</h5><ul><li>Compliance monitoring of common anions in drinking water as specified in U.S. EPA Method 300.0 (A)</li><li>Separation of common inorganic anions in 13 min in drinking water, wastewater, food &amp; beverages, scrubber solutions, and other diverse sample matrices</li><li>Superior retention and quantification of fluoride, glycolate, acetate, and formate</li><li>Compatible with a sodium tetraborate gradient to optimize difficult separations</li><li>Solvent compatibility permits easy column cleanup after the analysis of samples with hydrophobic components.</li></ul><h5>Multiple Formats Available for Application Flexibility</h5><ul><li>4x250mm, 2x250mm analytical columns</li><li>4x50mm, 2x50mm guard columns</li><li>Longer 25mm columns facilitate higher resolution separations of more complex sample matrices</li><li>Smaller i.d. columns provide higher mass sensitivity, eluent and reagent conservation and lower operating costs</li></ul>Note: Use with the Dionex IonPac AS14 Eluent Concentrate for simple, accurate eluent preparation.<h4>Specifications</h4><ul><li>Anion Exchange Capacity: 65 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 65 μeq</li><li>Column Chemistry: Carbonate/Bicarbonate</li><li>For Use With (Application): Analysis of Fluorides and Other Inorganic Anions</li><li>Ion Exchange Group: Alkyl Quaternary Ammonium</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 2 to 12, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS14</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li><li>pH: 2 to 12</li></ul>

Thermo Scientific Dionex IonPac AS14A IC Columns

Thermo Scientific Dionex IonPac AS14A IC Column is high capacity anion-exchange column for fast isocratic separation of inorganic anions in environmental matrices

Deliver fast isocratic separation of inorganic anions from diverse and complex matrices such as drinking water, wastewater, foods and beverages, and scrubber solutions with the Thermo Scientific™ Dionex™ IonPac™ AS14A Carbon Eluent Anion-Exchange Column. The Dionex IonPac AS14A column meets or exceeds the requirements of U.S EPA Method 300.0 (A). However, the Dionex IonPac AS22 Carbonate Eluent Anion-Exchange column, an advanced carbonate eluent column, is recommended for fast analysis of inorganic anions. For the fastest separation of inorganic anions using a carbonate/bicarbonate eluent, the Dionex IonPac AS22-Fast column is recommended.<h5>Fast Separation of Inorganic Anions in Diverse Matrices</h5><ul><li>Compliance monitoring of common anions in drinking water as specified in U.S. EPA Method 300.0 (A)</li><li>Separation of common inorganic anions in 8 min (3 x 150mm format) or 13 min (4 x 250mm format) in diverse sample matrices</li><li>Superior retention and quantification of fluoride</li><li>Compatible with sodium or potassium hydroxide gradient to optimize difficult separations</li><li>Solvent compatibility permits easy column cleanup after the analysis of samples with hydrophobic components.</li></ul><h5>Multiple Formats Available for Application Flexibility</h5><ul><li>4x250mm, 3x150mm analytical columns</li><li>4x50mm, 3x30mm guard columns</li><li>Longer 250mm columns facilitate higher resolution separations of more complex sample matrices</li><li>Shorter 150mm columns produce faster runs of relatively clean matrices</li><li>Smaller i.d. columns provide higher mass sensitivity, eluent and reagent conservation and lower operating costs</li></ul>Note: Use with the Dionex IonPac AS14 Eluent Concentrate and the Combined Seven Anion Standard for simple, accurate eluent preparation.<h4>Specifications</h4><ul><li>Anion Exchange Capacity: 65 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 120 μeq</li><li>Column Chemistry: Carbonate/Bicarbonate</li><li>For Use With (Application): Anion Exchange</li><li>Ion Exchange Group: Alkyl Quaternary Ammonium</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 2 to 11, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS14A</li><li>Format: Standard Bore</li><li>pH: 2 to 11</li></ul>

Thermo Scientific Dionex IonPac AS29-Fast-4μm IC Columns

Analyze inorganic anions in high ionic strength matrices using Thermo Scientific™ Dionex™ AS29-Fast-4μm ion chromatography (IC) columns.

Analyze inorganic anions in high ionic strength matrices using Thermo Scientific™ Dionex™ AS29-Fast-4μm ion chromatography (IC) columns. Specifically designed to handle high ionic strength samples, Dionex IonPac AS29-Fast-4μm columns can easily separate the common inorganic anions in less than 10 minutes and can tolerate samples with high or low pH without requiring any pretreatment. They are ideal for analzying drinking water, wastewater, process streams, and scrubber solutions. Use with the Dionex AS29 Eluent Concentrate for fast, convenient, and reliable eluent preparation.<h5>Fast separation of common inorganic anions with excellent resolution</h5><ul><li>Achieve fast, isocratic separation of common inorganic anions in less than 10 minutes.</li><li>Analyze high ionic strength samples without compromising the separation of other analytes.</li><li>Excellent resolution of carbonate away from the common inorganic anions.</li><li>Robust stationary phase can tolerate acidic or basic samples without the need for pretreatment.</li><li>Similar peak efficiency to Dionex IonPac AS22-Fast-4μm column with the same elution order.</li><li>Solvent compatibility permits easy column cleanup after the analysis of samples with hydrophobic components.</li><li>Use with Dionex AS29 Eluent Concentrate for simple and accurate eluent preparation.</li></ul><h5>Use with a High Pressure IC system</h5>Higher resolution is achieved through the use of smaller resin particles, which produce a column backpressure over 3000 psi at the standard flow rates. A high-pressure IC system, such as the Thermo Scientific™ Dionex™ ICS-5000+ HPIC™ system or Thermo Scientific™ Dionex™ Integrion™ HPIC system is required to operate this column under standard conditions.<h4>Specifications</h4><ul><li>Anion Exchange Capacity: 126 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 126 μeq</li><li>Column Chemistry: Carbonate/Bicarbonate</li><li>For Use With (Application): Anion Exchange</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 5000 psi (345 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% Organic HPLC Solvents</li><li>Stationary phase: Super Macroporous Resin</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS30 IC Columns

Achieve high resolution separations of trace oxyhalides and inorganic anions in drinking water with Thermo Scientific Dionex IonPac AS30 columns.

Achieve high resolution separations of trace oxyhalides and inorganic anions in drinking water with Thermo Scientific™ Dionex™ IonPac™ AS30 columns. The column selectivity has been optimized for trace level analysis of bromate in drinking water preserved with ethylenediamine (EDA). EDA is used as a preservative in some drinking water samples and can cause interference with early eluting peaks. The high capacity of this hydroxide-selective anion-exchange column allows large loop injections for trace analysis (μg/L) without sample pre-treatment or preconcentration.<h5>Superior Chromatographic Performance</h5><ul><li>Optimized for analysis of trace bromate in drinking water preserved with EDA</li><li>High capacity: 477 μeq/column (4 x 250 mm) allows large loop injections for trace analysis</li><li>Column selectivity has been optimized at an operating temperature of 30°C</li><li>Compatible with organic solvents</li></ul><h5>Unique Selectivity for Samples Preserved with Ethylenediamine</h5>The selectivity of the Dionex IonPac AS30 column has been optimized to facilitate quantitation of trace levels of bromate in drinking water containing up to 50 ppm ethylenediamine (EDA). Ethylenediamine is sometimes added to drinking water samples as a preservative and can react with carbonate to produce artifacts that interfere with early eluting analytes such as fluoride. The Dionex IonPac AS30 column minimizes this interference by increasing the separation between fluoride and the EDA carbamate artifact, allowing better integration of the fluoride peak. In comparison to the Dionex IonPac AS19 and IonPac AS27 columns, the Dionex IonPac AS30 column features unique selectivity and much higher column capacity to enable separation of fluoride from the EDA carbamate artifact as well as separation of carbonate and sulfate for better quantification of sulfate.The Dionex IonPac AS30 column is suitable for determining bromate at 5 ppb in a matrix containing up to 50 ppm each of chloride, carbonate, and sulfate. For trace bromate analysis below 5 ppb in higher ionic strength matrices (where chloride levels exceed 50 ppm), the Dionex IonPac AS19 column is recommended. Alternatively, the Dionex IonPac AS27 column is recommended for higher ionic strength matrices preserved with EDA.<h5>Use with a High-Pressure IC system</h5>A high-pressure IC system such as the Thermo Scientific™ Dionex™ ICS-5000+, Dionex ICS-6000, or Dionex Integrion HPIC™ system is required to use this column under standard operating conditions.<h4>Specifications</h4><ul><li>Anion Exchange Capacity: 6 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 477 μeq</li><li>Column Chemistry: Hydroxide</li><li>For Use With (Application): Anion Exchange</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 5000 psi (345 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: Super Macroporous Resin</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS32-Fast-4μm IC Columns

Resolve polythionates, persulfate, polysulfonated aromatics, and aromatic dyes and pigments with the Thermo Scientific Dionex IonPac AS32-Fast-4μm column.

Resolve polythionates, persulfate, polysulfonated aromatics, and aromatic dyes and pigments with the Thermo Scientific™ Dionex™ IonPac™ AS32-Fast-4μm column. The unique selectivity of the Dionex IonPac AS32-Fast-4μm column allows it to resolve trace amounts of perchlorate in matrices containing high levels of chloride and sulfate within ten minutes using simple, isocratic conditions. Compared to similar anion-exchange columns packed with 7-9μm resin particles, Dionex IonPac AS32-Fast-4μm columns produce more efficient peaks, resulting in more accurate integration and more reliable results.<h5>Superior Chromatographic Performance</h5><ul><li>High capacity allows injection of complex matrices without overloading the column while maintaining excellent peak shapes for lower concentration analytes.</li><li>Ultralow hydrophobicity and reduced 150mm column length allow for fast analysis of highly polarizable anions such as perchlorate and iodide with a simple, isocratic eluent.</li><li>Quickly separate disparate concentration ratios (1:1000) of perchlorate in high sulfate matrices using simple, isocratic conditions.</li><li>Separate polythionates such as dithionate, trithionate, and tetrathionate.</li><li>Separate color additives including FD&amp;C Yellow #5, FD&amp;C Yellow #6, FD&amp;C Blue #1, and FD&amp;C Red #40 using a hydroxide gradient.</li></ul><h5>Use with a High-Pressure IC system</h5>A high-pressure IC system, such as the <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/410">Thermo Scientific™ Dionex™ ICS-6000 HPIC system</a> or <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/408">Thermo Scientific™ Dionex™ Integrion™ HPIC system</a> is required to operate this column under standard conditions.<h4>Specifications</h4><ul><li>Anion Exchange Capacity: 126 μeq</li><li>Crosslinking: 55% DVB</li><li>Column Capacity: 126 μeq</li><li>Column Chemistry: Hydroxide</li><li>For Use With (Application): Anion Exchange</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 5000 psi (345 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: Super Macroporous Resin</li><li>Format: Standard Bore</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS4A-SC IC Columns

For fast, isocratic separation of inorganic anions in environmental waters, the Thermo Scientific Dionex IonPac AS4A-SC column was the preferred column for many years. 

For fast, isocratic separation of inorganic anions in environmental waters, the Thermo Scientific™ Dionex™ IonPac™ AS4A-SC column was the preferred column for many years. It was first introduced in 1984 and is the specified column in U.S. EPA Method 300.0 (A). However, the advanced, high-capacity Dionex IonPac AS22 Carbonate Eluent Anion-Exchange column is recommended for fast analysis of inorganic anions in diverse matrices when using carbonate eluents.<h5>Fast Isocratic Separation of Inorganic Anions in Simple Matrices</h5><ul><li>Compliance monitoring of common anions in drinking water as specified in U.S. EPA Methods 300.0 (A)</li><li>Separation of common inorganic anions in 10 minutes in water, food and beverages, and other diverse sample matrices</li><li>Compatible with sodium tetraborate gradient to optimize difficult separations</li><li>Solvent compatibility for easy column cleanup after the analysis of samples with hydrophobic components</li></ul><h5>Multiple Formats Available for Application Flexibility</h5><ul><li>4×250mm, 2x250mm analytical columns</li><li>4×50mm, 2x50mm guard columns</li><li>Longer 250mm columns facilitate higher resolution separations of more complex sample matrices</li><li>Smaller i.d. columns provide higher mass sensitivity, eluent and reagent conservation and lower operating costs</li></ul>Note: Use with the Dionex IonPac AS4A Eluent Concentrate for simple, accurate eluent preparation.<h4>Specifications</h4><ul><li>Column Capacity: 20 μeq</li><li>Column Chemistry: Carbonate/Bicarbonate</li><li>Crosslinking: 0.5% DVB</li><li>For Use With (Application): Separation of Inorganic Anions, Anion Exchange</li><li>Ion Exchange Group: Alkanol Quaternary Ammonium Ion</li><li>Max. Pressure: 4000 psi (275 bar)</li><li>Solvent Compatibility: pH 0 to 14, 0 to 100% HPLC Solvents</li><li>Stationary phase: IonPac AS4A-SC</li><li>Packing Material: Ethylvinylbenzene/Divinylbenzene</li></ul>

Products from category HPLC columns focused on Ion chromatography - page 4

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