Use of Inhalable Cr^<+6> Exposures to Characterize Urinary Chromium Concentrations in Plating Industry Workers

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• Use of Inhalable Cr^<+6> Exposures to Characterize Urinary Chromium Concentrations in Plating Industry Workers : Jyh-Larng CHEN, et al. Department of Environmental Engineering and Health, Yuanpei Technology College-In this study, both personal sampling and biological monitoring were conducted on 27 and 30 workers selected from decorative plating and hard-surface plating operation, respectively. For personal sampling, the inhalable aerosol sampling technique was adopted in order to measure worker's soluble Cr^<+6> exposure level (C_<INH>) on the last day of the workweek. For biological monitoring, a urine specimen was collected at the end of the shift on the last day of the work week in order to determine a worker's urinary chromium concentration (C_<URINE>). Results show that hard-surface plating workers had higher C_<INH> (arithmetic mean ≈ 25.2 μg/m^3) than decorative plating workers (arithmetic mean ≈ 1.91 μg/ m^3). The above results could be due to the longer plating time involved in the former plating operation than in the latter. The relationship between C_<INH> and C_<URINE> was found as C_<URINE>= 1.86 C_<INH>- 0.21 (R^2=0.87,n=57), which suggests that the inhalable aerosol sampling results were able to explain the variation in workers' urinary chromium concentrations up to 87%. Assuming the level of C_<INH> was equivalent to the current TLV-TWA of 50μg/ m^3,the above regression model yielded a level of C_<URINE> as approximately 93 μg/g・creatinine. The above value is clearly different from the current present biological exposure index BEI of 30 μg/g・creatinine which is known to be applicable only to welding workers. The above discrepancy could be due to the intrinsic difference in particle size distribution between the Cr^<+6> droplets generated during the plating process and Cr^<+6> fumes generated during the welding process. Considering that no BEI has been suggested for chromium plating industries, the result obtained in this study will be helpful in introducing a new BEI in the future.

• 社団法人日本産業衛生学会の論文

著者

• Chen Jin-luh

  Southern Region Labor Inspection Office Council Of Labor Affairs

• Chen J‐l

  Yuanpei Technol. Coll.

• GUO YUE-LIANG

  Department of Environmental and Occupational Health, National Cheng Kung University Medical College

• Su Li-fang

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University

• Tsai P‐j

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University

• Tsai Perng-jy

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University:s

• Tsai Perng-jy

  Department Of Environmental And Occupational Health College Of Medicine National Cheng Kung Universi

• CHEN Jyh-Larng

  Department of Environmental Engineering and Health, Yuanpei University College of Health Science

• Guo Yue-liang

  Department Of Environmental And Occupational Health Medical College National Cheng Kung University T

• Guo Yue-Liang

  Department of Environment and Occupational Health, National Cheng Kung University Hospital

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