水、土壤及植物样品中1,2,4-三氯苯的提取和GC测定

Extraction of 1, 2, 4-trichlorobenzene from Water, Soil and Plant Tissue and Its Analysis on Gas Chromatography.

1 引言三氯苯(1,2,4-TCB)是化学工业和合成农药的重要原料,但同时也是环境中广泛存在的污染物。早在1979年,1,2,4-TCB就被美国环保局列入129种优先控制的污染物之一。在我国1,2,4-TCB也是常见的一种有机污染物。水体和土壤中1,2,4-TCB的分析方法国内已见报道。但这些方法大多步骤复杂、操作困难,而且费时、试剂消耗量大。另外,目前尚没有植物样品中1,2,4-TCB分析方法的报道。本文建立了步骤简单、易操作、节约试剂的水、土壤、植物和作物籽实中1,2,4-TCB的提取和分析方法。

Ultrasonic extraction was used in the study on the analysis of 1,2, 4-trichlorobenzene. In the study, 1,2, 4-TCB in water samples was extracted with n-hexane whereas that in soil and plant, with mixture of n-hexanc and acetone at 9: 1. In all experiment, extractant of 15-25ml and an extraction timeof 2h were performed. The recoveries of 1, 2, 4-trichlorobenzene from water, soil and plant (tissue stem and foliage of alfalfa and rice grain) were found to be more than 85% , 65% and 62%, respectively. The method was simple, sensitive and reliable for the analysis of 1,2, 4-TCB, which is avolatile chemical, with low reagent demand, and applicable in the analysis of other chlorobenzenes in environment.