Paper Information

Journal:   JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY   FALL 2006 , Volume 8 , Number 3 (30); Page(s) 11 To 20.
 
Paper: 

IDENTIFICATION OF PARAMETERS INFLUENCING HEXAVALENT CHROMIUM MIST MEASUREMENT USING TAGUCHI EXPERIMENTAL DESIGN

 
 
Author(s):  TIRGAR A., GOLBABAEI F., NOUR ELAHI K., SALEHI MASOUD
 
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Abstract: 

Hexavalent chromium, Cr+6, has been classified as a human respiratory carcinogen. Many workers in different industrial fields, mainly chromium electroplating, are exposed to this chemical. So, there has been a considerable interest among industrial hygienists in assessing Cr+6 concentrations accurately.  Since Cr+6 is relatively unstable and is likely to decrease during sampling and sample storage and analysis, it is necessary to determine the effective factors which influence Cr+6 mist sampling. Therefore, this study was carried out in order to determine the major parameters influencing Cr+6 mist sampling method, using Taguchi experimental design. A chromium electroplating bath was used to produce homogeneous mist and a total of 24 Cr+6 mist samples were collected using the U.S. National Institute for Occupational Safety and Health method 7600.  The results revealed that Cr+6 concentration was higher: (1) for sampling by closed-face filter cassettes than for sampling by open-face filter cassettes (P <0.05); (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).Taguchi test results showed that the optimal conditions for Cr+6 measurement were as follows: sampling at a height of 35 cm, sampling duration of 30 min, immediate sample extraction, and sampling with closed-face filter cassettes. Under these conditions, the highest Cr+6 concentrations would be collected and the highest degree of confidence could be obtained.

 
Keyword(s): HEXAVALENT CHROMIUM MIST, MIST, ELECTROPLATING, TAGUCHI EXPERIMENTAL DESIGN
 
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