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Abstract
The analysis of chromium by atomic absorption spectrophotometry using different flame conditions and the level of blank contamination on the filters commonly used for collecting chromium air samples were evaluated. Cellulose ester filters spiked with 10 μg of chromium solution were analyzed according to NIOSH Method 7024 using a variety of flame conditions and calibration curves. In each experiment, an air-acetylene flame was used. In experiment 1, an oxidizing flame and a two-point calibration curve were employed. Experiments 2 and 3 both used a reducing flame; however, a two-point calibration curve was employed in experiment 2 and a multipoint calibration curve in experiment 3. The best results were obtained by using a reducing flame and a multipoint calibration curve.
A number of blank cellulose ester filters of two types (Millipore AA and Gelman GN) were analyzed for chromium contamination. Both filter types showed significant chromium contamination.