Use of inhalable Cr +6 exposures to characterize urinary chromium concentrations in plating industry workers

Jyh Larng Chen, Yue Liang Guo, Peng-Chi Tsai, Li Fang Su

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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 50 μg/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.

Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalJournal of Occupational Health
Volume44
Issue number1
DOIs
Publication statusPublished - 2002 Mar 19

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Chromium
Welding
Industry
Environmental Monitoring
Aerosols
Threshold Limit Values
Particle Size
Urine

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health

Cite this

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title = "Use of inhalable Cr +6 exposures to characterize urinary chromium concentrations in plating industry workers",
abstract = "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 50 μg/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.",
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Use of inhalable Cr +6 exposures to characterize urinary chromium concentrations in plating industry workers . / Chen, Jyh Larng; Guo, Yue Liang; Tsai, Peng-Chi; Su, Li Fang.

In: Journal of Occupational Health, Vol. 44, No. 1, 19.03.2002, p. 46-52.

Research output: Contribution to journalArticle

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