Study of an analytical method for hexavalent chromium

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.
• 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.