二氯苯、二溴苯和硝基氯苯是常用的化工原料或试剂,其中常常混有不希望含有的异构体。这些位置异构体之间的沸点近似,特别是间-对异构体在一般情况下难以分离。如采用涂有选择性固定液的毛细管色谱柱,用较短的色谱柱即可快速而有效地分离和测定所含的异构体。对二氯苯、二溴苯和硝基氯苯各个异构体的分离,文献中有一些报导,但尚未见到用PEG-20M毛细管色谱柱全面研究它们分离 Dichlorobenzene, dibromobenzene and nitrochlorobenzene are common chemical raw materials or reagents in which unwanted isomers are often mixed. The boiling points between these positional isomers are approximate, and in particular the meta-para isomers are generally difficult to separate. In the case of capillary columns coated with selective fixatives, shorter columns can be used to quickly and efficiently separate and determine isomers. Isolation of various isomers of p-dichlorobenzene, dibromobenzene and nitrochlorobenzene has been reported in the literature but it has not been fully explored using PEG-20M capillary columns for their separation