Determination of Thiosulfate in Refinery and Other Wastewaters
Applications | 2001 | Thermo Fisher ScientificInstrumentation
Natural gas souring leads to anion contamination of amine solutions and heat stable salts formation. Monitoring of thiosulfate and sulfate content ensures efficient amine regeneration and corrosion control in refinery processes.
This study presents an ion chromatography method for determination of thiosulfate in refinery and industrial wastewaters. It demonstrates reproducible hydroxide gradient generation and efficient separation of polarizable anions using a dedicated column and suppressed conductivity detection.
Separation of 17 anions including six polarizable species was achieved without organic modifiers and with sharp peak shapes. Thiosulfate calibration was linear from 1 to 100 mg per liter with r2 of 0.9999. Analysis of refinery and industrial wastewater samples demonstrated accurate quantification and stable baselines enabled by the generated eluent.
The presented IC method provides robust determination of thiosulfate in refinery and other wastewaters. Combining the IonPac AS16 column with EG40 eluent generation and suppressed conductivity detection enables reproducible separation of polarizable anions without organic modifiers.
Ion chromatography
IndustriesEnvironmental
ManufacturerThermo Fisher Scientific
Summary
Importance of the topic
Natural gas souring leads to anion contamination of amine solutions and heat stable salts formation. Monitoring of thiosulfate and sulfate content ensures efficient amine regeneration and corrosion control in refinery processes.
Objectives and overview of the study
This study presents an ion chromatography method for determination of thiosulfate in refinery and industrial wastewaters. It demonstrates reproducible hydroxide gradient generation and efficient separation of polarizable anions using a dedicated column and suppressed conductivity detection.
Methodology and instrumentation used
- Chromatographic system based on a DX-500 IC with GP50 gradient pump CD20 detector AS40 sampler and LC30 oven
- EG40 Eluent Generator producing high purity potassium hydroxide gradients without carbonate interference
- IonPac AS16 analytical column 4 mm x 250 mm with AG16 guard column
- Suppressed conductivity detection in autosuppression recycle mode using ASRS ULTRA suppressor
- Gradient profile from 1.5 mM to 25 mM KOH over 40 minutes at 1.0 mL per minute and 30 °C
- Standards prepared from 1000 mg per liter mixed anion stock and diluted for thiosulfate calibration from 1 to 100 mg per liter
- Wastewater samples diluted as needed to fall within the calibration range
Main results and discussion
Separation of 17 anions including six polarizable species was achieved without organic modifiers and with sharp peak shapes. Thiosulfate calibration was linear from 1 to 100 mg per liter with r2 of 0.9999. Analysis of refinery and industrial wastewater samples demonstrated accurate quantification and stable baselines enabled by the generated eluent.
Benefits and practical applications of the method
- Automated eluent generation ensures reproducible gradients and low carbonate levels
- High capacity column delivers efficient separation of challenging anions in complex matrices
- Sensitive conductivity detection with low background noise
- Adaptable method for routine monitoring of amine regeneration and process control
Future trends and potential applications
- Workflow integration with online sample preparation for real time waste stream monitoring
- Expansion to additional polarizable anions and trace contaminants in environmental samples
- Use of higher throughput columns and faster gradients for process analytical technology
- Coupling with mass spectrometry for enhanced selectivity and compound identification
Conclusion
The presented IC method provides robust determination of thiosulfate in refinery and other wastewaters. Combining the IonPac AS16 column with EG40 eluent generation and suppressed conductivity detection enables reproducible separation of polarizable anions without organic modifiers.
References
- Kadnar R Rieder J Journal of Chromatography A 1995 Vol 847 Pages 339 343
- Dionex Application Note 134 Determination of Low Concentrations of Perchlorate in Drinking and Ground Waters by Ion Chromatography
- Jackson P E Laikhtman M Rohrer J S Journal of Chromatography A 1999 Vol 850 Pages 131 135
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