蒸気状及び粒子状多環芳香族炭化水素による室内及び大気環境の汚染状況 静岡市及び清水市における調査結果

Abstract

A survey on air pollution by polycyclic aromatic hydrocarbons (PAHs) was conducted in 67 houses in Shizuoka and Shimizu cities in the summer of 1996. Gaseous and particulate PAHs in living room, bedroom, kitchen and outdoor air were collected by using a sampler that consisted of glass fiber filter and XAD-2 adsorbent tube, and analyzed by a HPLC/ spectrofluorometry/computer system. Main results were as follows:1) Thirty-three PAHs were determined among 37 target compounds from indoor and outdoor air samples. Nineteen PAHs were found in gaseous phase, which had mainly 2- to 4-rings. Eighteen PAHs were found in particulate phase, which had mainly 4- to 7-rings. Four PAHs having 4-rings were found in both phases. Though Shizuoka and Shimizu are among the cleanest cities in Japan, many PAHs were determined from indoor and outdoor samples. This result suggests that the present method is useful for a survey on indoor and outdoor PAH pollution.2) Indoor and outdoor levels of particulate PAHs were similar and significantly correlated each other. It was suggested that indoor levels of particulate PAHs were largely affected by outdoor air pollution.3) Regarding gaseous PAHs, indoor levels of 9 PAHs were significantly higher than outdoor levels. This suggests the presence of indoor emission sources of PAHs, and insect repellents were considered to be one of the important emission sources of naphthalene.4) As compared with outdoor levels, PAH concentrations in indoor air varied largely by the differences of lifestyles.