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

Significance of the Topic

Aqueous calibration solutions of iodide are critical for accurate quantitative analysis in various environmental, pharmaceutical and industrial laboratories. Certified reference materials ensure traceability to SI units, support method validation and quality control in spectrometric and electroanalytical techniques.

Objectives and Overview of the Study

This certificate describes the preparation, certification and intended use of ASTASOL® AN90741H, an aqueous iodide calibration solution. The aim is to provide a reliable, homogeneous and stable certified reference material (CRM) for method calibration and performance verification across atomic spectrometry, molecular absorption and selected electroanalytical methods.

Methodology and Instrumentation

The CRM was produced by precise gravimetric dissolution of high-purity potassium iodide (KI, 99.995%) in ultrapure demineralized water. Key instrumentation and procedures included:

• Analytical balance for gravimetric preparation ensuring direct SI traceability.
• Argentometric titration to verify certified iodide concentration and associated uncertainty (k = 2).
• Ion chromatography to profile trace anionic impurities (Br⁻, Cl⁻, F⁻, NO₂⁻, NO₃⁻, PO₄³⁻, SO₄²⁻) for information purposes.

Main Results and Discussion

The certified iodide concentration is 1 000 ± 2 mg/L (1 001 ± 3 mg/kg) at 20 °C, with density 0.9990 ± 0.0005 g/cm³. Homogeneity studies confirmed consistent concentration across bottles, and stability tests guarantee performance over a five-year shelf life when stored between 5–30 °C. Trace impurities were below detection limits, ensuring negligible interference in calibration.

Benefits and Practical Applications

Using ASTASOL® AN90741H offers laboratories:

• High confidence in calibration accuracy for AAS, AES, ICP-OES, ICP-MS and molecular spectrometry.
• Simplified validation of electroanalytical methods targeting iodide.
• Reduced uncertainty and direct traceability to SI units supporting regulatory compliance and inter-laboratory comparability.

Future Trends and Potential Applications

Advances in multi-element certification, on-line calibration interfaces and digital certification will further streamline analytical workflows. Emerging needs include microvolume CRM formats, automated handling systems and expansion to complex matrices for environmental and biological monitoring.

Conclusion

ASTASOL® AN90741H is a robust, SI-traceable iodide calibration solution offering excellent homogeneity, stability and minimal trace impurities. Its certified value and uncertainty render it an essential CRM for accurate method calibration and validation in diverse analytical laboratories.

References

No references were cited in the source document.