采用Tenax吸附管吸附车间空气中的二甲基乙酰胺、丁酮和癸烷(十烷),经热解吸,样品在SE30大口径毛细管气相色谱柱上分离,外标法峰面积定量,系统分析了这三种挥发性有机化合物的含量.研究表明,这三种有机物经热解吸后的回归曲线的相关系数均在0.992以上,Tenax管吸附效率达90%以上,热解吸率达85%以上,样品的平均回收率为85%-110%.

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%.