Ward P, Smyth M R
School of Chemical Sciences, Dublin City University, Dublin 9, Ireland.
Talanta. 1993 Jul;40(7):1131-7. doi: 10.1016/0039-9140(93)80176-r.
The development of a polypyrrole-based modified electrode for use in the detection of anions in flow-injection analysis and ion chromatography is described. Chloride, nitrate, nitrite, perchlorate, bromide, carbonate, sulphate and phosphate were detected by using flow-injection analysis combined with the polypyrrole-based CME electrochemical detector. All of the anions were detected conveniently and reproducibly over a linear concentration range 1-100 mug/ml. A detection limit of 0.1 mug/ml was obtained for chloride and a limit of 1.0 mug/ml for all of the other anions. Chloride, nitrate, sulphate and phosphate, following separation using ion chromatography, were detected simultaneously by using a conductivity detector and the polypyrrole-based CME electrochemical detector in series. Both methods of detection yielded similar results with comparable sensitivity, linearity and limits of detection. This method was then applied to the analysis of fresh water samples. The electrode was stable over a 2-week period of operation with no evidence of chemical or mechanical deterioration.
本文描述了一种基于聚吡咯的修饰电极的研制，该电极用于流动注射分析和离子色谱中阴离子的检测。采用流动注射分析结合基于聚吡咯的化学修饰电极（CME）电化学检测器对氯离子、硝酸根离子、亚硝酸根离子、高氯酸根离子、溴离子、碳酸根离子、硫酸根离子和磷酸根离子进行了检测。所有阴离子在1-100μg/ml的线性浓度范围内均可方便且可重复地检测。氯离子的检测限为0.1μg/ml，其他所有阴离子的检测限为1.0μg/ml。使用离子色谱分离后，氯离子、硝酸根离子、硫酸根离子和磷酸根离子通过串联使用电导率检测器和基于聚吡咯的CME电化学检测器同时进行检测。两种检测方法均产生了具有可比灵敏度、线性和检测限的相似结果。然后将该方法应用于淡水样品的分析。该电极在2周的运行期内保持稳定，没有化学或机械劣化的迹象。
