In order to evaluate the effectiveness of environmental intervention of work place, metal mercury concentration in air and in urine of the total 43 workers for 3years from December 1991 to October 1993 in a fluorescent lamp manufacturing industry exposed to mercury, was measured before and after implementation of controls such as establishing exhaust ventilation at the department of exhaustion, coating the floor of work place with epostane, cleaning of the floor, improved housekeeping, and etc.
The results were as follows.
1. Before the intervention(December 1991) 39.0% exceeded metal mercury Threshold Limit Value(TLV, 0.05㎎/㎥). After the intervention(October 1993) 10.1 % exceeded TLV and geometric mean of mercury in air was 0,1㎎/㎥, and showed effectiveness rate of intervention to be 74.4%.
2. After the intervention, geometric means of mercury concentrations in air were 0.013, 0.019㎎/㎥ and showed effectiveness rate of intervention to be 76.6%, 65.5% in A factory(right tube lamp) and at exhaustion department, respectively, A follow up survey fround statistically significant reductions in mercury concentration in air three years later.
3. Mercury concentration in urine of 11 workers(29.7%) exceeded warning level of 100㎕/ℓ before the intervention. After the intervention, of 3 workers(8.8%) exceeded warning level and geometric mean of mercury concentration(26.5㎕/ℓ) in urine was 2.4 times than that of before the intervention.
Geometric means of mercury concentrations in urine of workers at exhaustion department, at sealing and aging department were 44.0, 77.7㎕/ℓ, respectively and they decreased 2.3, 3.2 times than that of before the intervention.
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