Biological Monitoring of Styrene in FRP-Making Small Industries in Kumamoto, Japan : Winter-Summer Difference and Effect of Protective Masks in Practical Working Conditions
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概要
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Objective: Studies were carried out in Kumamoto, Japan to examine 1) the winter-summer differences in the average individual exposure to styrene (8hr-TWA) and to end-shift-urinary mandelic acid (MA in g/g Cr), 2) the possible seasonal difference in their relationship, and 3) the protective effect of a disposable particulate respirator containing charcoal fiber (called a "charcoal mask") and a charcoal granule cartridge-mask (called a "gas mask") in the real working conditions. Methods: Approximately 100 male and female workers from about 10 small industries were subjected to the studies first in winter and second in summer. Individual exposure to styrene was monitored with a passive sampler during work time, and end-shift-urine was collected to determine urinary MA excretion. The content of their activities and the types of protective equipment were observed and recorded by the minute throughout the working day. Results: Neither individual exposure to styrene nor urinary MA excretion differed at the time of the study in both "no-mask" and "gas mask" groups. The urinary MA excretion was related to individual exposure to styrene in both seasons, with the highest correlation coefficient in the "no-mask" group. Since the regression slope for the "charcoal mask" group did not differ from that for "no-mask" group, the "charcoal mask" was judged to have little protective effect in practical working conditions. From the difference in urinary MA values at 50 ppm (previous TLV-TWA by ACGIH) of individual exposure to styrene in the two regressions for "no-mask" and "gas mask" groups, 49% of styrene was protected against by the "gas mask" in winter, and 45% in summer. Conclusions: Despite different physical environmental conditions, individual exposure to styrene and urinary MA excretion did not differ by season in FRP-making industries. A "gas mask" is more recommended than a "charcoal mask" when treating styrene, although their protective effects are decreased in practical working settings. It is basically necessary to give correct information on and free access to such protective equipment to styrene-treating workers.
- 社団法人日本産業衛生学会の論文
著者
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MINAMOTO Keiko
Department of Environmental Health, Faculty of Medical and Pharmaceutical Sciences, Kumamoto Univers
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KITANO Takao
Department of Public Health, Kumamoto University
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INAOKA Tsukasa
Department of Public Health, Kumamoto University School of Medicine
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Nagano Megumi
Department of Public Health, Kumamoto University Medical School
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Nagano M
Department Of Public Health Kumamoto University School Of Medicine
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Nagano Megumi
Department Of Public Health Kumamoto University Medical School
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Tasaki Ryuji
The Chemo-sero-therapeutic Research Institute
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Kitano Takao
Department Of Public Health Graduate School Of Medical Sciences Kumamoto University
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Inaoka T
Department Of Environmental Sociology Faculty Of Agriculture Saga University
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Inaoka Tsukasa
Department Of Environmental Sociology Faculty Of Agriculture Saga University
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Minamoto Keiko
Department Of Public Health Kumamoto University School Of Medicine
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Minamoto Keiko
Department Of Environmental Health Faculty Of Medical And Pharmaceutical Sciences Kumamoto Universit
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USHIJIMA Kayo
Department of Public Health, Kumamoto University School of Medicine
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KOYANAGI Atsuko
Health Management Center, Japan Red-Cross Hospital
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Ushijima K
Department Of Public Health Kumamoto University School Of Medicine
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Ushijima Kayo
Department Of Public Health School Of Medicine Fukuoka University
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Koyanagi Atsuko
Health Management Center Japan Red-cross Hospital
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