Concentration of chlorpyrifos and S-421 residues in polished rice stored in houses as an index for residential exposure to termiticides

WATANABE Misaki, MIZUSHIMA Aki, YOSHIDA Seisaku

doi:10.7879/siej.22.3

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シロアリ防除剤クロルピリホスとS-421の室内汚染調査(2007年から2016年)
シロアリ防除剤クロルピリホスとS-421の室内汚染調査(2007年から2016年) : 貯蔵精白米中濃度を指標として
シロアリボウジョザイクロルピリホスト S-421 ノシツナイオセンチョウサ(2007ネンカラ 2016ネン) : チョゾウセイハクベイチュウノウドオシヒョウトシテ
―貯蔵精白米中濃度を指標として―

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Abstract

Indoor exposure to chlorpyrifos (an organophosphorus termiticide) and S-421 (an organochlorine synergist) of residents was investigated by examining the residual levels of the termiticides in polished rice stored in houses for a week. The survey covered 244 ordinary families in the Kansai area from 2007 to 2016. Diazinon and fenitrothion in the rice was analyzed at the same time. <br>The polished rice was homogenized with acetone • hexane and then purified by silica gel column. Quantitative analysis for chlorpyrifos, diazinon and fenitrothion were performed by GC-FPD, and for S-421 was performed by GC-ECD. The detection frequency of organophosphorus termiticide was 9/244 for chlorpyrifos, no diazinon was detected, and fenitrothion was 12/244. The highest value was 35 ng/g (2008) for chlorpyrifos and 4.3 ng/g (2016) for fenitrothion. In 6 out of 9 cases where chlorpyrifos were detected, they were carrying out termite control before 2003. In July 2003, chlorpyrifos was banned from use as termite control application of houses in Japan. S-421 was detected from 214 out of 216 samples, the highest value was 29 ng/g (2008). Although the detection frequency of S-421 was high, it turned out that the concentration level decreased during the surveillance period.

Journal

Indoor Environment

Indoor Environment 22 (1), 3-14, 2019

Society of Indoor Environment, Japan

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