CRM Iodide (I-) - Aqueous calibration solution ASTASOL® AN90741H

Significance of the Topic

Accurate calibration of iodide in aqueous solutions is critical for reliable analytical results in environmental monitoring, pharmaceutical quality control and industrial processes.

Objectives and Overview

The certificate for ASTASOL® AN90741H describes a certified reference material (CRM) of iodide in water, aiming to provide a traceable calibration standard with well-defined concentration and uncertainty.

Methodology and Instrumentation

The iodide solution is prepared gravimetrically using high-purity potassium iodide (99.995%) and ultrapure water. Certification is achieved through argentometric titration, ensuring SI traceability.

Instrumentation

• Argentometric titration for concentration verification
• Ion chromatography for trace impurity analysis
• Atomic spectrometry techniques for intended use (AAS, AES, ICP-OES, ICP-MS)
• Molecular absorption spectrometry and selected electroanalytical methods

Main Results and Discussion

The certified iodide concentration is 1,000 ± 2 mg/L (1,001 ± 3 mg/kg) at 20 °C, with density of 0.9990 ± 0.0005 g/cm³. Trace impurities of halides and common anions are below detection limits, confirming solution purity. Homogeneity and stability studies support a five-year shelf life and twelve-month usability after opening, under specified storage conditions.

Benefits and Practical Applications

• Provides a reliable calibration standard for various spectrometric and electroanalytical methods
• Ensures measurement accuracy and SI traceability
• Simplifies method validation and quality assurance workflows in laboratories

Future Trends and Opportunities

Anticipated developments include multi-analyte calibration solutions, integration of digital certificates for real-time traceability, and microfluidic delivery formats to support high-throughput and on-site analysis.

Conclusion

ASTASOL® AN90741H is a robust CRM for iodide calibration, combining high purity, low uncertainty, and rigorous traceability. Its comprehensive documentation and stable performance make it a valuable tool for analytical laboratories.

References

• ASTASOL® AN90741H Certificate, Analytika, spol. s r.o., version 01, 2022