CRM Fluorides (F-) - Aqueous calibration solution ASTASOL® AN8073HIC

Significance of Fluoride Calibration Solutions

Reliable quantification of fluoride in aqueous samples underpins environmental monitoring, drinking water safety and quality control in industrial processes. Certified reference materials (CRMs) such as ASTASOL® AN8073HIC provide a traceable benchmark to validate analytical methods and ensure data comparability across laboratories.

Objectives and Overview of the Certificate

This certificate documents the production and certification of an aqueous fluoride calibration solution. The material is intended for calibration and validation of techniques including atomic spectrometry (AAS, AES, ICP-OES, ICP-MS), molecular absorption spectrometry and electroanalytical methods. Key properties such as concentration, uncertainty, homogeneity and stability are defined to ISO Guide 31 and ISO 17034 standards.

Methodology and Instrumentation

The certified fluoride concentration (100.0 mg l⁻¹, expanded uncertainty ±0.2 mg l⁻¹ at k=2) was established by gravimetric preparation, ensuring direct SI traceability. Verification employed complexometric titration against NIST SRM 928. Trace impurities were assessed by ion chromatography and spectrophotometry to inform users of potential interferences.

Used Instrumentation

• High-precision balance for gravimetric preparation
• Complexometric titration apparatus with standardized reagents
• Ion chromatography system for anion profiling
• Spectrophotometer for complementary impurity analysis

Main Results and Discussion

The solution matrix consists of ultrapure demineralized water (resistivity ≥ 18 MΩ·cm, 0.22 µm filtered), further purified through a 0.45 µm membrane to protect chromatographic columns. Density at 20 °C is 1.0002 g·cm⁻³ (±0.0005 g·cm⁻³). Trace anions (Br⁻, Cl⁻, I⁻, NO₂⁻, NO₃⁻, PO₄³⁻, SO₄²⁻) were below detection limits, indicating high inherent purity. Homogeneity and stability studies confirm consistent performance over a 5-year shelf life when stored between 5–30 °C.

Benefits and Practical Applications

ASTASOL® AN8073HIC streamlines method calibration, enhances interlaboratory comparability and supports regulatory compliance. Its well-characterized uncertainty and traceability facilitate quality assurance in water analysis, industrial monitoring and electroanalytical applications.

Future Trends and Potential Uses

Advances in microfluidic sensors and field-deployable electrochemical probes will increase demand for stable, low-volume CRMs. Integration with automated calibration routines and digital certificates may further improve data integrity and laboratory efficiency.

Conclusion

The certified aqueous fluoride solution ASTASOL® AN8073HIC offers a robust, traceable standard for a broad range of analytical methods. Its stringent certification process and documented performance ensure reliable calibration and validation, supporting high-quality analytical results in research, compliance and industrial settings.

Reference

Analytika®, spol. s r.o., Certificate ASTASOL® AN8073HIC, Version 01, 24.03.2023.