工业废水中酚类污染物的毛细管电泳—安培检测应用研究(英文)

发展了毛细管电泳—安培检测方法,并将这一联用技术应用于苯酚、2,4-二氯苯酚、对硝基苯酚和邻、间、对甲酚的同时分离检测中.考察了氧化还原电位、缓冲溶液酸度、盐度、分离驱动电压及进样时间等因素对分析检测的影响.在优化实验条件下,以Na_2HPO_4-NaOH(pH11.38)为缓冲体系,6种酚类物质能够在25 min内实现基线分离,氧化还原电位0.78 V(versusSCE)下可以定量检测(三电极体系为:直径为300μm的碳圆盘电极、饱和甘汞电极及铂电极).实验结果表明,其线性达3个数量级(S/N=3),检测限达10^(-7)mol/L.本文还尝试把该方法应用于两个实际工业污水的酚类污染物的检测,其回收率为94.0%～107.0%,结果令人满意.因此,该方法可为政府及企业环境检测部门提供一种快速、准确、低廉、无污染、重现性高的质量控制方法.

Simultaneous determination of phenolic pollutants in wastewater using CE-AD

A method based on capillary electrophoresis coupled with amperometric detection (CE-AD) was developed for the simultaneous determination of phenols: 2,4-dichlorophenol, p-nitrophenol, o-cresol, m-cresol and p-cresol. The effects of working electrode potential, pH and concentration of running buffer, separation voltage and injection time on CE-AD were investigated. Under the optimum conditions, the aim analytes could be separated in buffer solution of Na₂HPO₄-NaOH at pH 11.38 within 25 min. A 300 μm diameter carbon disk electrode generated good current responses at +0.78 V ( vs SCE) for all analytes. The current responses were linear with concentrations over three orders of magnitude with detection limits at 10^-7mol/L (S/N=3) and the recoveries were in the range of 94.0%～107.0%. This method could be successfully applied to the analysis of actual sample from coking plants with satisfactory results.