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Study of an analytical method for hexavalent chromium.

O P Bhargava, H E Bumsted, F I Grunder

American Industrial Hygiene Association Journal

|June 1, 1983

Summary

The diphenylcarbazide method underestimated chromium (VI) levels. Alkaline extraction methods showed higher accuracy and precision for occupational health samples, suggesting their suitability for industrial environments.

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Area of Science:

Environmental Chemistry
Analytical Chemistry
Occupational Health

Background:

Chromium (VI) is a regulated industrial and occupational hazard.
Accurate measurement of chromium (VI) is crucial for workplace safety.
Existing analytical methods may face challenges with complex industrial samples.

Purpose of the Study:

To evaluate the diphenylcarbazide colorimetric method for chromium (VI) analysis.
To compare the performance of alternative analytical procedures.
To identify the most suitable method for occupational health monitoring in industrial settings.

Main Methods:

Analysis of spiked PVC filters using the diphenylcarbazide method.
Simultaneous testing of three alternative analytical procedures by multiple laboratories.

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Comparison of results based on recovery, precision, and potential interferents.

Main Results:

The diphenylcarbazide method and one alternative method yielded reduced chromium (VI) amounts.
Two alternative methods employing alkaline extraction demonstrated higher recoveries and precision.
Alkaline extraction appears more effective for samples from steel industry environments.

Conclusions:

The diphenylcarbazide method may not be optimal for all occupational settings.
Alkaline extraction procedures show promise for accurate chromium (VI) determination in industrial environments.
Further research is recommended to establish the definitive best analytical method.