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۱EVALUATION OF PARAMETERS INFLUENCING HEXAVALENT CHROMIUM MIST SAMPLING: A FULL FACTORIAL DESIGN
اطلاعات انتشار: Iranian Journal of Chemistry and Chemical Engineering (IJCCE)، بيست و ششم،شماره۴(پياپي ۴۴)، ۲۰۰۷، سال
تعداد صفحات: ۸
A chromium electroplating bath with the ability to produce homogenous mist was used to evaluate parameters influencing hexavalent chromium (Cr+6) mist sampling methods. The results of 48 Cr+6 mist samples collected using the U.S. National Institute for Occupational Safety and Health method 7600 showed that Cr+6 concentration was higher: (1) For sampling by closed–face filter cassettes than for sampling by open–face filter cassettes (P 0.001); (2) for samples collected at 35 cm above the electroplating solution surface than for samples collected at 50 cm (P 0.001); (3) for sampling duration of 30 minutes than for sampling duration of 180 minutes (P 0.001); and, (4) for samples extracted immediately after sampling than for samples with delayed extraction (24 hours after sampling) (P 0.001). It is concluded that the accuracy of Cr+6 mist sampling in electroplating shops will be enhanced when: (1) closed–face filter cassette is used to prevent liquid splash contamination; (2) the recommended sampling height is 35 cm above the solution surface; (3) the sampling duration is short––approximately 30 minutes; and, (4) the extraction of the Cr+6 sample is performed as soon as the sampling is completed
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