关于改进非甲烷总烃测定方法的探讨

根据非甲烷总烃排放标准、分析方法和实际监测情况，对非甲烷总烃定义、总烃峰型异常、氧峰干扰、方法检出限测定和采样容器选择等方面存在的问题进行了探讨。结果表明：气态烃的衍生物属于非甲烷总烃，烃的衍生物和色谱柱类型是导致总烃峰型异常的主要原因，使用除烃空气作载气可消除氧峰干扰，非甲烷总烃为差值结果，应按照EPA SW-846标准测定检出限，PVF气袋本底低、气密性和化学惰性好，是最佳的非甲烷总烃采样容器。

Study on the Improvement of Method for Determination of Non-methane Hydrocarbons

According to the emission standard, analysis method and practical monitoring situation of non-methane hydrocarbons, the problems existing in the definition of non-methane hydrocarbon, the abnormal of total hydrocarbons peak, the disturbance of oxygen, the detection limit and sampling vessel were explored. The results showed that the gaseous hydrocarbon derivatives belong to non-methane hydrocarbon, the gaseous hydrocarbon derivatives and column type are the main factors to make the abnormal of total hydrocarbons peak, the disturbance of oxygen can be eliminated by using de-hydrocarbon air as carrier gas, determination of the detection limit of non-methane hydrocarbon should be determined according to the EPA SW-846 methods, PVF sampling bag that have low background, good air tightness and chemically inert is the best sampling vessel.