A Simple Analytical Technique for the Determination of Hexavalent Chromium in Welding Fumes and Other Complex Matricies

摘要

A systematic study of analytical methods for the determination of hexavalent chromium shows that currently existing techniques are unsatisfactory when used with welding fumes, the s-diphenylcarbazide method proposed by NIOSH permitting less than 1% recovery of Cr+6 from a synthetic welding fume of known composition. A new (carbonate leaching) technique is proposed which permits better than 80% recovery of both soluble and insoluble chromium (VI). This technique is then used as part of a general method for the determination of total chemical composition as distributed among sample fractions of different solubility. The method is specifically designed for use in the analysis of small samples and is especially suitable for routine evaluation of health risks as found in the working environment. (Copyright (c) The Danish Welding Institute Copenhagen 1979.)