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Determination of chlorite in drinking water using capillary electrophoresis with amperometric detection

机译：毛细管电泳-安培检测法测定饮用水中的亚氯酸盐

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Capillary electrophoresis with end-column electrochemical detection (CEEC) was used to determine chlorite (ClO2-) in drinking water. Two CE methods were developed. The first method used a positive CE polarity with a 25 mM Berate buffer, pH 8.9. The second method used a negative CE polarity and a 25 mM phosphate buffer, pH 7.5 with 1 mM dodecyl trimethyl ammonium bromide (DTAB) added to reverse the EOF. The required detection potential was +1.0 V (vs. Ag/AgCl) in the positive polarity mode and +0.90 V (vs. Ag/AgCl) in the negative polarity mode. In both polarity modes, the analysis time for chlorite was less than 6 minutes. Calibration plots ClO2- in tap wafer and in deionized water were found to be linear between 0.1 and 10 mg L-1 (r greater than or equal to 0.994) with detection limits of 5 mu g L-1 (S/N = 3) in both modes. The concentration of chlorite found in samples from a water treatment plant was 0.5 to 1.7 mg L-1. The relative standard deviation (RSD) in peak height for injections of 1.0 mg L-1 chlorite standards were 5.4% using the positive polarity mode and 2.7 % using the negative polarity mode. The RSD in peak height for injections of samples from the water treatment plant were 5.2 % and 6.6 % for positive and negative polarity respectively (n = 5). [References: 32]
机译：采用毛细管电泳和柱尾电化学检测法（CEEC）测定饮用水中的亚氯酸盐（ClO2-）。开发了两种CE方法。第一种方法使用正CE极性和25 mM Berate缓冲液，pH 8.9。第二种方法使用负极CE极性和25 mM磷酸盐缓冲液（pH 7.5），并添加1 mM十二烷基三甲基溴化铵（DTAB）来反转EOF。所需的检测电势在正极性模式下为+1.0 V（vs. Ag / AgCl），在负极性模式下为+0.90 V（vs. Ag / AgCl）。在两种极性模式下，亚氯酸盐的分析时间均小于6分钟。发现自来水晶圆和去离子水中的校准曲线ClO2-在0.1至10 mg L-1（r大于或等于0.994）之间呈线性，检出限为5μg L-1（S / N = 3）在两种模式下。从水处理厂的样品中发现的亚氯酸盐浓度为0.5至1.7 mg L-1。使用正极模式时，注射1.0 mg L-1亚氯酸盐标准液时，峰高的相对标准偏差（RSD）为5.4％，使用负极模式时为2.7％。从水处理厂进样的峰高的RSD，正极和负极（n = 5）分别为5.2％和6.6％。 [参考：32]

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