23种挥发性有机化合物在3种吸附剂上漏出容量的测定评价

采用吸附热解吸－气相色谱－质谱法对23种挥发性有机化合物Chromosorb 106、Tenax TA、Tenax TG等3种吸附剂上漏出容量进行了测定。根据实验结果确定了不同的化合物应选择不同的吸附剂及相应的采样体积。结果表明，Chromosorb 106可较好地吸附低沸点的挥发性有机化合物，Tenax TA、Tenax TG均可用于沸点较高的挥发笥有机化合物吸附，这对测定大气中的有机化合物含量采样有一定的参考价值。

Assessment of the Breakthrough Volumes for 23 Solvents(VOC) on 3 Different Sorbents

The breakthrough volumes of 23 volatile organic compounds(VOC) on 3 sorbents are reported. Four mixtures of volatile organic compounds were prepared and were allowed to pass through 3 types of sorbent tubes(Chromosorb 106, Tenax TA and Tenax TG) with various volumes of nitrogen carrier gas. The compounds were then thermally desorbed and analyzed by GC-MS. The compounds tested were methanol, ethanol, iso _ propanol, n _ propanol, iso _ butanol, n _ butanol; ethyl acetate, iso _ propylacetate, iso _ butyl acetate, butyl acetate; acetone, 2 _ butanone, benzene, toluene, ethyl benzene; pentane dichloromethane, hexane, chloroform, 1,1,1 _ trichloroethane, heptane, trichloroethylene,and tetrachloroethylene. It is concluded that Chromosorb 106 is a better sorbent for low boiling _ point volatile organic compounds, the breakthrough volume being no less than 2 litre at a flow rate of 100 mL/min, except for methanol. There is no significant difference between the performance of Tenax TA and Tenax TG tubes, which are suitable for high boiling _ point compounds.