SIMULTANEOUS DETERMINATION OF 1,1,1-TRICHLOROETHANE AND ITS STABILIZER IN WATER PROOFING AEROSOL PRODUCTS BY DRYSPACE METHOD

A method for the simultaneous determination of 1,1,1-trichlorethane (T CE) and it's stabilizer 1,4-dioxane (DO), 1,2-epoxybutane (EB), nitrom ethane (NM), nitroethane (NE) in household aerosol products by gas chr omatography (GC) was developed. In this dryspace method, an aerosol pr oduct sample was propelled into 50 ml beaker. The propelled solution ( 3-4 ml) was weighed in a 10 ml test tube, and the same weight of 1,2-d ichloropropane (DCP) as an internal standard was added. Sixteen mu l o f this sample solution was loaded to a pre-cooled syringe (25 mu l), a nd was injected to a sealed vial (125 ml). The vial was tapped slightl y for the wide spreading of the solution, and the solution was ascerta ined to evaporate to dryness within 3 minutes. A part of 250 mu l of t he vial gas was applied to GC. A fused silica capillary column was use d as the GC column. If 16 mu l of the sample solution had not been eva porated with 3 minutes in a vial, the headspace method was employed fo r the determination of TCE and the stabilizer. By this method, 20 comm ercial water proofing aerosol products were analyzed, and TCE was dete cted in 17 products in the range of 48.9-93.1%, DO was in 12 products, 1.42-2.17%, EB was in 14 products, 200-3100 ppm, NM was in 12 product s, 500-2800 ppm NE was in 3 products, 900-1000 ppm. Headspace method w as employed for 2 products in 20.