Personal indium exposure concentration in respirable dusts and serum indium level

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  • IWASAWA Satoko
    Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan
  • NAKANO Makiko
    Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan
  • MIYAUCHI Hiroyuki
    Department of Environmental Management, School of Health Sciences, University of Occupational and Environmental Health, Japan
  • TANAKA Shigeru
    Department of Public Health, Graduate School of Human Life Science, Jumonji University, Japan
  • KAWASUMI Yaeko
    Occupational Health Research and Development Center, Japan Industrial Safety and Health Association, Japan
  • HIGASHIKUBO Ichiro
    Occupational Health Research and Development Center, Japan Industrial Safety and Health Association, Japan
  • TANAKA Akiyo
    Department of Environmental Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
  • HIRATA Miyuki
    Department of Environmental Medicine, Graduate School of Medical Sciences, Kyushu University, Japan
  • OMAE Kazuyuki
    Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Japan

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<p>The aim of this study was to assess the relationship between indium exposure concentration in the respirable dust fraction (In-E) and indium in serum (In-S) in workers. Methods: A total of 39 workers were studied. The study subjects were categorized into 3 groups, namely, smelting workers (n=7), ITO workers (n=6) in an ITO grinding plant, and other workers (n=26). In-E and In-S ranged from 0.004–24.0 μg/m3 and 0.1–8.50 μg/L, respectively. The simple regression equation was log(In-S)=0.322×log(In-E)-0.443. The simple correlation coefficients for the smelting workers, ITO workers and other workers were 0.489, 0.812 and 0.163, respectively. The differences in the relationships among the three groups suggest that In-S may vary with the chemical form to which the workers were exposed. In-E and In-S seem to be positively correlated. The correlation coefficient was higher for both smelting and ITO workers than for other workers.</p>

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