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在气液色谱中,如何选择固定液和怎样对固定液进行评价和分类,是个十分关键的问题.1959年Rohrschneider曾提出“五级分度法”(又称“加号法”)用以评价固定液极性,此法虽被国内学者普遍采用,但存有许多不足之处.目前国外广泛应用经McReynolds改进的Rohrschneider“相特征常数法”,近年来国内不少学者亦已推荐应用,但此法工作量很大,它在评价一种固定液时,需同时测定苯、丁醇-1、戊酮-2、1-硝基丙烷和吡啶五种物质,以及相应的正构烷烃在该固定液上和在角鲨烷固定液上的校正保留时间,计算其保留指数后才能求得该固定液的X、Y、Z、U、S五个相特征常数和总相常数P.本文报道一种相特征常数的计算方法,以减轻工作量.
In gas-liquid chromatography, how to choose the fixative and how to evaluate and classify the fixative is a very crucial issue. In 1959 Rohrschneider proposed a “five-level indexing” (also called “plus sign”) to evaluate Although this method is widely used by domestic scholars, it has many shortcomings.With the extensive application of Rohrschneider’s “Phase Constant Method”, which is improved by McReynolds, many scholars in China have also recommended it in recent years This method a lot of work, it is in the evaluation of a fixed solution, the simultaneous determination of benzene, butanol-1, pentanone -2,1-nitropropane and pyridine five substances, and the corresponding n-alkanes in the Fixed liquid and the squalane stationary phase retention time, calculate the retention index in order to obtain the fixative X, Y, Z, U, S five phase characteristic constants and the total phase constant P. reported here A method of calculating the characteristic constants to reduce the workload.