title: Solid absorbent collection and gas chromatographic determination of the propylene glycol butyl ether esters of 2,4,5-T in air.
abstract: A method has been developed and validated for the collection of the propylene glycol butyl ether esters of 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) in air and their determination by gas chromatography with electron capture detection. The samples are collected on XAD-2 resin, desorbed in diethyl ether prior to analysis. The procedure is designed for industrial hygiene monitoring to provide an accurate 4 hour time-weighted average of the exposure level. Recoveries were found to be 97 +/- 8% (2 sigma) for the propylene glycol butyl ether esters of 2,4, 5-T in the concentration range of 0.70 ppb (v/v) to 5.00 ppm (v/v). Breakthrough concentrations, storage effects and humidity effects were also investigated.
mesh_terms: D015085:2,4,5-Trichlorophenoxyacetic Acid / Q000031:analogs & derivatives*; D000388:Air / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods*; D004781:Environmental Exposure; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D008452:Maximum Allowable Concentration; D012116:Resins, Plant
chemical_list: D012116:Resins, Plant; D015085:2,4,5-Trichlorophenoxyacetic Acid