|
This study was conducted to establish model between lead and ZPP concentration in blood of workers exposed to lead. Workers employed in secondary smelting manufacturing industry showed 85.1 ㎍/㎗ of blood lead level, exceeding 60 ㎍/㎗, the Criteria for Removal defined by Occupational Safety and Health Act of Korea. Average blood lead level of workers in the battery manufacturing industry was 51.3 ㎍/㎗, locating between 40 ㎍/㎗ and 60 ㎍/㎗, the Criteria for Requiring Medical Removal. Blood lead level in the litharge and radiator manufacturing industry was below 40 ㎍/㎗, the Criteria Requiring Temporary Medical Removal. Blood lead levels of workers by industry were significantly different(p$lt;0.05). 50(21 %) showed blood lead levels above 60 ㎍/㎗, the Criteria for Removal and 66(27.7 %) showed blood lead levels between the Criteria for Requiring Medical Removal, 40 - 60 ㎍/㎗. Thus, approximately 50 percent of workers indicated blood lead levels above 40 ㎍/㎗, the Criteria Requiring Temporary Medical Removal and should receive medical examination and consultation including biological monitoring. Average ZPP level of workers employed in the secondary smelting industry was 186.2 ㎍/㎗, exceeding above 150 ㎍/㎗, the Criteria for Removal. Seventy seven of all workers(32.3 %) showed ZPP level above 100-150 ㎍/㎗, the Criteria for Requiring Medical Removal. The most appropriate model for predicting ZPP in blood was log-linear regression model. Log linear regression models between lead and ZPP concentrations in blood was Log ZPP(㎍/㎗) =-0.2340 + 1.2270 Log Pb-B(㎍/㎗)(standard error of estimate=0.089, γ²=0.4456, n=238, P=0.0001). Blood-in-lead explained 44.56 % of the variance in log(ZPP in blood).
|