Abstract
Sampling method was developed for analysis of various pesticides in the atmosphere using silica gel column (SEP-PAK™ cartridge) as adsorbent. Thirty eight pesticides were measured for the recoveries after fortification to silica gel, stability on silica gel under air passing, storage stabilities on silica gel and collection efficiencies of gaseous pesticides. The recoveries of pesticides fortified to silica gel column were over 96%. Fenthion and disulfoton on silica gel under air passing were unstable and it was presumed that they were decomposed by oxidation during the air passing. Edifenphos, simetryne, dimethylvinfos, tetrachlorvinfos and EPN were unstable in silica gel column at 25°C, then silica gel column was necessary to be kept under -15°C until extraction after collection of the air. The collection efficiencies of butamifos, dimethoate, piperofos and phosmet were not satisfactory, i. e. 45-60%. However, the other 32 pesticides have useful efficiency.
