电增强环氧树脂基聚合物膜萃取水样中的硝基苯

Electrically enhanced extraction of nitrobenzene in water by epoxy resin-based polymer membrane

以环氧树脂基聚合物膜为萃取相,在电场作用下富集目标物,与高效液相色谱(HPLC)联用,应用于环境水样中硝基苯污染物的测定.考察了电压大小、萃取时间、洗脱时间、离子强度和溶液pH值对电增强萃取效率的影响.实验结果表明,环氧树脂基聚合物膜的萃取量与膜上所施加的控制电位相关,阴极极化时,膜对硝基苯的萃取量增大;在阳极极化时,膜萃取量减小.在电压为-0.3kV,硝基苯溶液pH=4的条件下,萃取20min,得到该方法的检出限为0.015μg·mL-1,在0.05～3.0μg·mL-1范围内具有良好的线性关系,可决系数为0.9929,变异系数小于5%.用上述方法分析鱼塘水,硝基苯3种不同加标水平的回收率为79.8%～108.2%.结果表明,该方法既可用于环境水样品中的硝基苯去除又可用于检测.

An electrically enhanced extraction method of nitrobenzene in water samples was developed by using epoxy resin matrix membrane.The level of nitrobenzene was then determined by high performance liquid chromatography.The main extraction conditions were investigated,including electric potential,extraction time,desorption time,solution pH and ion strength.The results showed that the cathodal polarization enhanced extraction capacity significantly,while the anodic polarization had negative effect on membrane extraction.The optimized extraction parameters were following：pH=4,electric potential-0.3 kV,and extraction time 20 min.The proposed method showed good linear relationship in the range of 0.05~3.0 μg · mL-1,with the linear correlation coefficient 0.9929,low detection limit（S/N=3） 0.015 μg · mL-1,and the coefficient of variation 〈5%.The recoveries of nitrobenzene in aquatic water samples by the standard addition method ranged from 79.8%~108.2%.This method could be applied to remove and determine nitrobenzene in water environment.