CRM Iodide (I-) - Aqueous calibration solution ASTASOL® AN907410H

Significance of the topic

Aqueous calibration standards for halide analysis play a critical role in ensuring accurate and traceable measurements in a wide range of analytical applications, including environmental monitoring, pharmaceutical quality control, and industrial process analysis. The availability of a reliable iodide reference solution supports method validation and instrument calibration, helping laboratories maintain data quality and comply with international standards.

Objectives and overview of the certificate

This certificate documents the preparation, characterization, and intended use of ASTASOL® AN907410H, a certified reference material (CRM) for iodide (I–) in aqueous solution. It specifies the material’s composition, certified value, uncertainty, traceability, homogeneity, stability, shelf life, and recommended handling procedures.

Methodology and traceability

The iodide CRM was prepared gravimetrically using high-purity potassium iodide (KI, 99.999%) dissolved in ultrapure demineralized water. Gravimetric techniques ensure direct traceability to the SI unit kilogram. The certified concentration and its expanded uncertainty (k=2) were verified by argentometric titration. Impurity profiling was performed by ion chromatography to inform users of trace anion levels, though these data are not intended for calibration.

Instrumentation

• High-precision analytical balance for gravimetric preparation
• Argentometric titration setup for concentration verification
• Ion chromatography system for trace anion analysis

Main results and discussion

The certified iodide concentration in ASTASOL AN907410H is 10 000 mg/L with an expanded uncertainty of ±20 mg/L at 20 °C. The solution density was determined as 1.0072 g/cm³ (±0.0005 g/cm³). Homogeneity and stability studies confirm consistent performance over a five-year shelf life under specified storage conditions (5–30 °C, unopened). Once opened, the aluminium bag should be resealed and the material used within 12 months.

Benefits and practical applications

The CRM supports calibration and validation of analytical methods such as atomic spectrometry (AAS, AES, ICP-OES, ICP-MS), molecular absorption spectrometry, and selected electroanalytical techniques. Laboratories benefit from certified traceability, reduced uncertainty in quantitative assays, and documented compliance with ISO requirements.

Future trends and potential uses

Advances in online and in situ monitoring may drive demand for certified calibration solutions compatible with microfluidic and sensor platforms. Integration of digital certification and blockchain-based traceability could enhance data integrity. Multi-element reference materials and dynamic standards for flow-based systems represent emerging opportunities.

Conclusion

ASTASOL AN907410H provides a robust, SI-traceable iodide calibration solution with well-characterized uncertainty, homogeneity, and stability. Its broad applicability and compliance with ISO Guide 31 and ISO 17034 requirements make it a valuable tool for laboratories seeking reliable quantitative analysis.

References

• ISO Guide 31:2015 – Reference materials: Contents of certificates
• ČSN EN ISO 17034:2017 – Competence of reference material producers
• ISO/IEC 17025:2018 – Competence of testing and calibration laboratories
• ČSN EN ISO 9001:2016 – Quality management systems