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KMID : 0382420010270040051
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Korean Journal of Environmental Health Society
2001 Volume.27 No. 4 p.51 ~ p.62
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Exposure Evaluation to Total Welding Fume and Manganese at Technical High Schools in Choong-Nam Area
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Lee Jong-Wha
Park Jong-An
Jang Bong-Ki
Jang Ji-Sun
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Abstract
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Geometric mean of airborne welding fume concentration at technical high schools was 4.80mg/㎥(N.D∼35.39 mg/㎥) and the percentage of samples exceeded TLV of the Korean ministry of labor was 43.6%. Geometric mean of airborne Mn concentration was 0.06mg/㎥(N.D∼0.42mg/㎥) and the percentage of samples exceeded TLV of ACGIH was 15.4%. In case of airborne Mn concentration, there is a significant difference among schools (P<0.05).
Mn concentrations in blood of the exposed and control groups were 1.84㎍/dl and 1.91㎍/dl, respectively. Mn concentrations in urine of the exposed and control groups were 1.36 ㎍/ℓ and 0.57㎍/ℓ , respectively. In case of Mn concentrations in urine, there is a significant difference between both groups(P<0.001) and among schools(P<0.05). Mn concentrations in blood and urine of exposed group were not over BEIs of the Korean ministry of labor. Mn levels in blood and urine were not significantly affected by smoking, drinking and residence. There was no correlation between Mn concentration in air and blood, but there was a statistically significant correlation between Mn concentration in air and urine(r=0.323). There was no a statistically significant correlation between Mn concentration in blood and urine.
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