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KMID : 0381319890280040126
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Korean Journal of Occupational Health
1989 Volume.28 No. 4 p.126 ~ p.137
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Trichloroethylene Exposure of Workers Employed in Degreasing Process of Metal Manufacturing
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Abstract
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Trichloroethylene(TCE) is a widely used organic solvent, especially in degreasing process of metal manufacturing, however few data concerning its exposure and poisoning were obtainable. This survey was performed for more information of TCE exposure in this country.
Urine samples were collected from 144 TCE handling workers, and prepared selfadministered questionnaire were given to TCE handling workers and 46 nonTCEexposed workers. TCE concentrations of four workshops in working environment were analyzed.
The results were as follows:
1. TCE exposed workers were 48 male and 96 female employees. Average total duration of employment of these workers was 39.0 months, average duration of works per day was 10.7 hours, and average duation of TCE handling was 469.7 minutes.
2. The average concentration of urine total trichlorocompounds was 156.32 mg / g creatinine, and that of trichloroacetic acid was 69.2 mg / g creatinine. Of those workers, 78 workers had the concentrations of urine trichloroacetic acid over 75 mg/g, which is the biological exposure index (BET) of urine trichloroacetic acid in Korea. Duration of work per day and duration of TCErelated work were significantly longer in the group of workers whose urine trichloroacetic acid concentration was over the criteria level of BEI.
3. TCE concentrations of three workshops were over the level of ACGIH TLV ( threshold limit value), 50 ppm in TWA (time weighted average). In remaining one workshop, duration of TCE related works was only one hour per day. There was statistically significant correlation between the concentration of TCE in working environment and the proportion of workers in a workshop whose urinary trichloroacetic acid concentration was over the criteria level of BEI.
4. Responses to selfadministered questionnaire were not meaningful for differentiation of psychoneurological symptcmc due to chronic TCE exposure from others.
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