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液-液萃取是富集水中有机污染物的较为广泛的一种前处理方法,但一般取样量和溶剂的用量较大,需要浓缩,易造成损失和环境再污染。近几年来,国外已报导采用微量萃取法分析工业废水中的主要有机污染物、饮用水中的挥发性氯化物,以及河水中的有机污染物和有机氯农药等,但国内尚未见报导。微量萃取法具有操作简便、快速、取样量和溶剂用量少、无需浓缩、再污染轻、节省人力等优点,尤其适用于污染物浓度较高的工业废水中的苯、甲苯、乙苯、邻二甲苯和1,3,5-三甲苯等化合物,最小检测量可达ppb级,满足工业废水分析的要求。
Liquid-liquid extraction is a more extensive pre-treatment method for enriching organic contaminants in water. However, the amount of sample and solvent used is generally large and needs to be concentrated to easily cause losses and environmental re-contamination. In recent years, foreign countries have reported the use of trace extraction of industrial waste water in the main organic pollutants, volatile chloride in drinking water, as well as river water organic pollutants and organochlorine pesticides, but has not been reported in China. Micro-extraction has the advantages of simple, rapid operation, less sample volume and solvent consumption, no need to concentrate, re-polish light, save manpower, etc. It is especially suitable for benzene, toluene, ethylbenzene and o-benzene in industrial wastewater with high pollutant concentration Xylene and 1,3,5-trimethylbenzene and other compounds, the minimum detection up to ppb level, to meet the requirements of industrial wastewater analysis.