GC DETERMINATION OF DIMETHYLACETAMIDE,BUTANONE AND DECANE IN THE AIR OF WORKSHOP

Dimethylacetamide (DMAM),butanone (BN) and decane (DC) in the air of workshop were sampled using Tenax absorption tube,and then desorbed in the thermo-desorption furnace at 300 ℃ for 40 s.The compounds in the gaseous state were introduced into the GC-analytical system by the carrier gas,and separated on the SE 30 capillary chromatographic column.The determination of the concentrations of the 3 compounds were performed by the measurement of their peak area and by the external standard method.The correlation coefficients of the linear regression equations for the 3 compounds were larger than 0.992.Absorption rates of the Tenax absorption tube for the 3 compounds were over 90%,and their rate of desorption were over 85%.Average recoveries obtained in the test for recovery were in the range of 85% to 110%.