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- W2390514616 abstract "The relationship between the degree of exposure and biological effects of manganese was studied in a group of 369 workers employed in the production of ferroalloys. Two other groups of workers, from an electrode plant and from an aluminium rolling mill, served as controls. Mean manganese concentrations at work places where ferroalloys were produced varied from 0-301 to 20-442 mg/m3. The exposure level of the two control groups was from 2 to 30 ?xg/m3 and from 0-05 to 0-07 ?xg/m3, in the electrode plant and rolling mill respectively. Sixty-two (16-8 %) manganese alloy workers showed some signs of neurological impairment. These signs were noticeably less in the two control groups (5-8 % and 0%) than in the occupationally exposed group. Subjective symp toms, which are nonspecific but may be symptoms of subclinical manganism, were not markedly different in the three groups. However, in the manganese alloy workers some of the subjective symptoms occurred more frequently in heavier smokers than in light smokers or nonsmokers. Heavier smokers engaged in manganese alloy production showed some of the subjective symptoms more often than heavier smokers from the control groups. The problem of the effects of manganese on human health still leaves some open questions, one of which concerns the relationship between the degree of exposure and biological response. For workers occupationally exposed to manganese the threshold limit value in the United States of America and Japan is as high as 5 mg/m3. Permitted exposure is considerably lower elsewhere. For instance, in Bulgaria the maximum permissible concentration (MAC) of manganese as Mn?2 is 002 mg/m3; in Poland and USSR 0-3 mg/m3 as Mn02. The MAC value for manganese in Yugoslavia is 2 mg/m3. To illustrate further the relationship between the degree of occupational exposure and biological effect of manganese we studied the symptoms and signs possibly associated with the most important effect of manganese, that on the central nervous system." @default.
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- W2390514616 date "1977-01-01" @default.
- W2390514616 modified "2023-09-24" @default.
- W2390514616 title "Occupational exposure to manganese1" @default.
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