CRM Bromides (Br-) - Aqueous calibration solution ASTASOL® AN907110H

Significance of the Topic

This document describes a certified reference material (CRM) for aqueous calibration of bromide ions. Reliable calibration standards are essential in analytical chemistry to ensure the accuracy and comparability of measurements across techniques such as atomic spectrometry and ion chromatography. High-quality CRMs support traceability to SI units and meet rigorous quality management standards.

Objectives and Study Overview

The main goal was to produce and characterize ASTASOL® AN907110H, a high-purity aqueous solution of bromide (Br–) at a nominal concentration of 10 000 mg/L. This CRM is intended for calibration and validation of spectrometric and electroanalytical methods. The certificate follows ISO Guide 31 and demonstrates metrological traceability and compliance with ISO 17034 accreditation.

Methodology and Instrumentation

The bromide solution was prepared gravimetrically from potassium bromide (KBr, 99.997% purity) dissolved in ultrapure demineralized water (resistivity ≥18 MΩ·cm). Gravimetric dilution ensures direct traceability to the kilogram. The certified concentration and its uncertainty were verified by argentometric titration. Trace impurities (Cl–, F–, I–, NO2–, NO3–, PO4³–, SO4²–) were quantified using ion chromatography for informational purposes only.

Main Results and Discussion

Certified mass concentration at 20 °C: 10 000 ± 20 mg/L (k=2). Derived mass fraction: 9 908 ± 30 mg/kg based on measured density (1.0093 ± 0.0005 g/cm³). Impurity levels were below detection limits (<0.02 mg/L for most anions, <0.05 mg/L for sulfate). Homogeneity tests confirmed uniformity across bottles, and stability assessments guarantee performance throughout the five-year shelf life under recommended storage conditions.

Benefits and Practical Applications

The CRM provides:

• Accurate, traceable calibration for AAS, AES, ICP-OES, ICP-MS, UV-visible molecular absorption spectrometry, and selected electroanalytical techniques
• Reduced measurement bias through gravimetric preparation and primary direct SI traceability
• Detailed uncertainty budget suitable for quality systems in industrial and research laboratories

Future Trends and Potential Uses

Emerging analytical platforms, such as high-resolution ICP-MS and novel sensor technologies, will continue to demand high-quality CRMs. Adaptations may include matrix-matched formulations or lower concentration ranges. Integration with digital certificate management and data-rich electronic labeling can further enhance usability in automated laboratories.

Conclusion

ASTASOL® AN907110H is a thoroughly characterized CRM for bromide determination, offering metrological traceability, low uncertainty, and broad applicability across spectrometric and electroanalytical techniques. Its stability and homogeneity make it a reliable standard for routine calibration and method validation.