顶空气相色谱分析原理与技术

系统讨论了静态顶空气相色谱的原理,包括多次相平衡法、改变相比法和标准加入定量法。测定了挥发性有机物在气液两相间的分配常数及其在水中的含量。提出了通过测定分配常数作为分析准确度的判据。研究了温度、相比、分配常数和无机盐对顶空分析灵敏度的影响。采用顶空色谱测定了河流底泥中的可酸挥发硫化物。

Theory and Technology of Headspace Gas Chromatograph Analysis

The paper described the theory of static headspace gas chromatography ,including multiple phase equilibration method,various gas-liquid phase ratio method and standard adding method.The Henry Law Constants and the concentration of chloroform,(n-hexane),p-xylene in water and dimethylsulfide in seawater were determined.Acid-volatile sulfide in river sediment sample was measured by reaction headspace.Effect of distribution constant,temperature,gas liquid phase ratio and salts on headspace sensitivity of static headspace gas chromatography was discussed.The results showed that effect of these factors on the sensitivity of static headspace gas chromatography is varied significantly with various compounds.