Zhao Chuan, Song Jun-Feng, Zhang Jun-Cai
Institute of Analytical Science, Northwest University, Xi'an 710069, P.R. China.
Anal Bioanal Chem. 2002 Oct;374(3):498-504. doi: 10.1007/s00216-002-1451-3. Epub 2002 Sep 7.
A flow injection (FI) method with a biamperometric detector, based on the biamperometry for an irreversible redox couple, is described for the determination of phenols in environmental wastewater. The method relies on coupling of the oxidation of phenols at one platinum-wire electrode with the reduction of MnO4- at another platinum wire electrode to enable biamperometric detection with an applied potential difference of 0 V. The linear dynamic range for the dependence of current on phenol concentration was from 1.0 x 10(-6) to 1.0 x 10(-4) mol L(-1), with a detection limit of 4.0 x 10(-7) mol L(-1) (signal-to-noise ratio, S/N=3). In comparison with the 4-aminoantipyrine (4-AAP) standard method and the 3-methyl-2-benzothiazoline hydrazone (MBTH) method the proposed method can be used to detect many para-substituted phenols that do not react with 4-AAP and MBTH, and response factors are higher for most of the phenols tested. The method, which is simple, economic, and rapid (180 samples h(-1)), has been applied to the analysis of four wastewater samples. The results obtained were compared with those from 4-AAP method. The recoveries obtained by adding phenol standards to samples ranged from 94.3 to 105.2% with a standard deviation of 3.6%.
本文描述了一种基于不可逆氧化还原电对双安培检测的流动注射（FI）方法，用于测定环境废水中的酚类物质。该方法基于在一个铂丝电极上酚类物质的氧化与另一个铂丝电极上MnO4-的还原相耦合，从而在施加电位差为0 V的情况下实现双安培检测。电流与酚浓度依赖性的线性动态范围为1.0×10(-6)至1.0×10(-4) mol L(-1)，检测限为4.0×10(-7) mol L(-1)（信噪比，S/N = 3）。与4-氨基安替比林（4-AAP）标准方法和3-甲基-2-苯并噻唑啉腙（MBTH）方法相比，该方法可用于检测许多不与4-AAP和MBTH反应的对取代酚类，并且对于大多数测试酚类，响应因子更高。该方法简单、经济且快速（每小时180个样品），已应用于四个废水样品的分析。将所得结果与4-AAP方法的结果进行了比较。通过向样品中添加酚标准品获得的回收率范围为94.3%至105.2%，标准偏差为3.6%。
