Exposure to Volatile Organic Chlorinated Chemicals and Estimation of Absorption of them in Residences.
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概要
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The concentrations of eight volatile organic chlorinated chmicals in indoor air, outdoor air and personal exposure concentrations in five married couples living in Osaka were determined in October and February, each twice (1995 and 1996), in order to know the pollution levels of the chemicals in residential air and to estimate the absorption amounts of them in personal exposure lebvels.<BR>The chmicals in atmosphere were collected by passive gas sampling tubes containing charcoal, and were determined by using gas chromatograph with electron capture detector. The geometric mean of. indoor concentration of <I>p</I>-dichlorobenzene (3.1 ppb, v/v) was highest, followed by those of 1, 1, 1-trichloroethane (0.52 ppb), trichloroethylene (0.47 ppb), chloroform (0.39 ppb), tetrachloroethylene (0.28 ppb), carbon tetrachloride (0.093 ppb), bromodichloromethane (0.052 ppb) and chlorodibromomethane (0.024 ppb). As indoor concentrations of <I>p</I>-dichlorobenzene and trihalomethanes were higher than outdoor concentrations of them in all houses, major sources of these chemicals were considered to be present in indoor. Further, the sources of the trihalomethanes were presumed to be same on the basis of the results of the correlation analysis among the concentrations of eight chemicals. The personal exposure concentrations of <I>p</I>-dichlorobenzene (1.5-21.2 ppb) were highest of those of the chemicals in husbands and wives in all homes.<BR>The absorption amounts of each chemical in personal exposure levels were estimated from the results of the previous pharmacokinetic studies of the chemicals in rats. <I>p</I>-Dichlorobenzene (2456nmol/day/60 kg of human body weight) was absorbed most abundantly amoung the volatile organic clorinated chemicals, comprising about 70% of the total absorption amounts of eight chemicals. The amounts of trichloroethylene (84 nmol) and chloroform (224nmol) were much next to that of <I>p</I>-dichlorobenzene, but the absorption amounts of the other five chemicals were much less than those of <I>p</I>-dichlorobenzene, trichloroethylene and chloroform. <I>p</I>-Dichlorobenzene, which was possibly carcinogenic to humans and was absorbed abundantly, was considered to be one of thee most noteworthy chemicals as indoor contaminant inhaled chronically.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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