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Studies on semen quality in workers exposed to manganese and electric welding

Wu, W.; Zhang, Y.; Zhang, F.

Zhonghua Yu Fang Yi Xue Za Zhi 30(5): 266-268

1996

ISSN/ISBN: 0253-9624
PMID: 9388882
Document Number: 460240
Three hundred and ten workers were selected to study the effects of manganese and electric welding on male reproductive function, with 211 occupationally exposed to manganese and electric welding fume and 99 controls. Concentrations of manganese and welding fume in the air of the work-place were 0.14 apprx 5.5mg/m-3 and 6.5 apprx 82.3mg/m-3, respectively. Semen concentrations of manganese, copper, chromium, nickel, and iron in workers employed in electric welding were significantly higher than those in controls. Time from ejaculation to liquefaction of semen in exposed workers was longer than that in controls, and volume of semen, sperm count, viable sperm count and percentage were significantly lower in the exposed workers than in the controls. Stepwise regression analysis suggests a direct toxic effect of manganese on sperm production.

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