居室空气中甲醛的气相色谱法分析

建立了测定居室空气中甲醛的衍生气相色谱法。方法的检测限为０．０２ｍｇ／Ｌ（水溶液），当采气量为１０Ｌ时，最低检出浓度为０．０１ｍｇ／ｍ３（居室空气），变异系数为４．１％～６．５％，回收率为７１．０％～９０．４％。

Determination of Formaldehyde in Indoor Air by Gas Chromatography

Formaldehyde in indoor air was collected by water, derivatized with 2,4 dinitrophenylhydrazine and extracted by cyclohexane. The sample was separated on an OV 17 and QF 1 mixed chromatographic column and determined by electron capture detector. The detection limit was 0.02mg/L(solution), the minimum detectable concentration was 0.01mg/m 3 while 10L indoor air was collected. The results show that this is a rapid and sensitive method with less interferences and fairly good precision. The recoveries were 71.0% 90 4% and coefficients of variation were 4.1% 6.5%. The development of this method has made a reliable methodological foundation for the determination of formaldehyde in indoor air.