Exposure to a organochlorine synergist, 2, 3, 3, 3, 2', 3', 3',3'-octachlorodipropylether (S-421) in inhabitants of two houses (A and B) treated for termite control was evaluated by examining the residue levels in rice. Polished rice left exposed to air for a week under the sink in the kitchen adsorbed S-421 to the extent of 0.0009 to 0.0091mg/kg (house A), or 0.22 to 0.58mg/ kg (house B). The level of S-421 in polished rice depended on the season, being high in summer and lower in winter. The

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... learance rate of S-421 from polished rice during the cooking process was found to be 71 percent overall. Sixty-three percent was due to washing of the rice grains with water and 8 percent was due to subsequent heating of the washed rice in an electric rice cooker. Daily intake of S-421 from rice was estimated approximately to be 0.2ag (house A) or 45, ig (house B). S-421 concentration in the ambient air of the dining room (1F) of house B was around 0.25ug/m3 throughout the year.