Components of flue gas were determined by two dimensional chromatograph free from switching valve, which consisted of four columns of Porapak S, 5A molecular sieve, chromosorb P and Porapak Q connected by series _ parallel.

• 将Porapak柱、ChromosorbP柱及5A分子筛柱串联后再并联 ,构成一个无阀切换的二维色谱 ,用于测定烟道气组成 ;