Sampling and Analysis of Phosphoric Acid Triesters in ambient air

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Method for the sampling and analysis of phosphoric acid triesters including triethyl phosphate, triallyl phosphate, tributyl phosphate, tri (chloethyl) phosphate, tri (chloropropyl) phosphate, triamyl phosphate, tri (dichloropropyl) phosphate, and triphenyl phosphate in ambient air have been studied. These compounds were collected on a glass fibier filter (7×9 inch) and XAD-7 resins (20g) with a high volume air sampler. The ambient air sample was extracted in a Soxhlet extractor. After treatment of hydrochloric acid and sodium hydroxide, the sample was cleaned up by silicagel column chromatography, and determined by gas chromatography with a nitrogen-phosphorous detector using fused silica capillary column. Collection efficiencies were obtained by spiking of standards on glass fiber filter and drawing through the ambient air at 700l/min for 24 hours. It was observed that tri (dichloropropyl) phosphate and triphenyl phosphate were adsorbed on glass fiber fi lter and other phosphoric acid triesters were mainly adsorbed on XAD-7 resins. This method was applied to ambient air sample in Kitakyushu district. Triethyl phosphate, tributyl phosphate, tri (chloroethyl) phosphate, tri (chloropropyl) phosphate, tri (dichloropropyl) phosphate, triphenyl phosphate were identified by GC/MS-MF. These compounds were detected approximately in the range of 2-5 ng/m3 in the ambient air.
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