Chlorpyrifos and S-421 Residues in Indoor Air and Polished Rice around Nine Years after Application for Termite Control

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  • シロアリ防除剤クロルピリホスとS-421の処理後約9年間の室内空気中及び精白米中濃度
  • シロアリ ボウジョザイ クロルピリホス ト S 421 ノ ショリ ゴ ヤク 9ネンカン ノ シツナイ クウキ チュウ オヨビ セイハク マイチュウ ノウド

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Abstract

We investigated the extent of human exposure to chlorpyrifos (an organophosphorus insecticide) and S-421 (an organochlorine synergist) by examining the residue levels in air and stored rice in two houses treated for termite control. Data for the five years following termiticide application were reported in a previous paper. In this paper, we report on the chlorpyrifos and S-421 levels in ambient air and polished rice, measured during the fifth to seventh (house B) and fifth to ninth (house F) years after termiticide application. Chlorpyrifos and S-421 levels detected in the air of the dining room of house B ranged from 0.005 to 0.09μg/m3 and from 0.15 to 1.03μg/m3, respectively. Chlorpyrifos and S-421 levels detected in the air of a Japanese-style room in house F ranged from 0.05 to 0.11μg/m3 and from 0.01 to 0.02μg/m3, respectively. Termiticide concentration in the air depended on the season, being higher in summer and lower in winter. Variation in termiticide concentration in polished rice reflected the concentration in the air. Summertime levels of chlorpyrifos and S-421 in the indoor air of house B did not decrease throughout the seven years while those in house F showed a slight decrease during the nine years after application of the termiticide.

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