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挥发性脂肪酸 (VFA)是厌氧反应器运行中重要的控制指标。研究了用程序升温及恒温分析厌氧反应器中 VFA的两种最佳色谱条件，程序升温较恒温条件下样品分离效果好，标准误差及变异系数小，样品回收率高，缺点是测一个样需 30min，耗时 ;恒温法的优点在于样品测定简便快速 ,测一个样只需 8～ 10min。同时比较了样品预处理加酸与不加酸的效果，证明样品酸化 (pH小于 2)是用气相色谱法直接分析 VFA的必需预处理。
VFA is an important control indicator of anaerobic reactor operation. Two kinds of optimal chromatographic conditions of VFA in anaerobic reactor were studied by program temperature and constant temperature. The sample separation efficiency was better under constant temperature than programmed temperature, the standard error and coefficient of variation were small, and the sample recovery rate was high. The disadvantage was that a sample Take 30min, time-consuming; The advantage of the constant temperature method is the simple and rapid determination of the sample, measuring a sample just 8 ~ 10min. At the same time, the effects of acid pretreatment and no acid addition were compared. It was proved that the sample acidification (pH less than 2) is an essential pretreatment for the direct analysis of VFA by gas chromatography.