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一、问题的提出用气相色谱做定性分析时,在有纯样条件下,多数用已知纯样对照定性。但是,哪一个实验室也不可能具备分析所需要的全部纯样品,因此利用文献发表的保留数据定性就显得很重要。目前,已广泛采用文献发表的相对保留值及保留指数对照定性。前者多用于较简单的样品。当样品组成比较复杂时,由于相对保留值只有一个基准物质,离基准物质较远的组份,其相对保留值误差较大,其次由于实验条件不同以及选取基准物的不一致性都给实际定性分析带来一定的困难和麻烦。
First, the question raised Gas chromatography qualitative analysis, in a pure sample conditions, the majority of known pure samples of control qualitative. However, it is not possible for any laboratory to have all of the pure samples required for the analysis, so it is important to characterize the retention data published in the literature. At present, the relative retention and the retention index published in the literature are widely used. The former is used for simpler samples. When the sample composition is more complicated, the relative retention value is relatively large, because the relative retention value is only one reference material, and the components far from the reference material have larger errors. Secondly, due to different experimental conditions and the inconsistency of the selected reference materials, the actual qualitative analysis Bring some difficulties and troubles.