CRM Chromium (Cr) -

Significance of the topic

Reference materials for calibration are essential to ensure accuracy and traceability in trace element analysis. They support reliable quantification in techniques such as atomic spectrometry and are critical for quality assurance in environmental monitoring, industrial process control and regulatory compliance.

Objectives and overview

This certificate details the preparation and certification of an aqueous calibration solution of chromium as a certified reference material. It provides information on composition, certified values, uncertainty, homogeneity, stability and intended use.

Methodology and instrumentation

The solution was prepared gravimetrically from high purity chromium nitrate nonahydrate in a 2 percent nitric acid matrix with ultrapure water. Certified concentration and its uncertainty were verified by inductively coupled plasma optical emission spectrometry and by comparison with an independent reference solution. Trace impurities were assessed by atomic absorption spectrometry, ICP OES and ICP MS to document their levels.

Instrumentation used

• Flame and graphite furnace atomic absorption spectrometers
• Inductively coupled plasma optical emission spectrometer
• Inductively coupled plasma mass spectrometer

Main results and discussion

The certified chromium concentration is 10.00 mg per liter with an expanded uncertainty of 0.05 mg per liter at 20 degrees Celsius. The matrix density is 1.0083 g per cubic centimeter with an uncertainty of 0.0005 g per cubic centimeter. Trace element levels were below detection limits for all monitored elements, confirming high purity. Homogeneity testing and stability studies support reliable performance over a two year shelf life when stored under recommended conditions.

Benefits and practical application

• Provides SI traceability for quantitative chromium analysis
• Enables method validation and calibration across multiple spectrometric techniques
• Supports quality control in environmental, industrial and research laboratories

Future trends and potential applications

Development of multi element reference materials and digital certification workflows will enhance laboratory efficiency. Integration with laboratory information management systems and automated calibration procedures is expected to improve data traceability and reduce manual intervention.

Conclusion

This certified reference material offers a reliable and traceable standard for chromium determination in aqueous media. Its rigorous certification, documented homogeneity and stability make it a valuable tool for analytical laboratories seeking high confidence in their calibration standards.

Reference

• ASTASOL AN7013N certificate Analytika spol s r o 2023
• ISO Guide 31
• ISO EN ISO 17034 2017
• ISO EN ISO 9001 2016
• ISO EN ISO IEC 17025 2018