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首页> 外文期刊>International Journal of Electrochemical Science >Voltammetric Determination of 2-Nitrobiphenyl and 4-Nitrobiphenyl Using a Mercury Meniscus Modified Silver Solid Amalgam Electrode
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Voltammetric Determination of 2-Nitrobiphenyl and 4-Nitrobiphenyl Using a Mercury Meniscus Modified Silver Solid Amalgam Electrode

机译：汞弯月形修饰银固体汞齐电极伏安法测定2-硝基联苯和4-硝基联苯

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摘要

Direct current voltammetry (DCV), differential pulse voltammetry (DPV), and differential pulseadsorptive stripping voltammetry (DPAdSV) at a mercury meniscus modified silver solid amalgamelectrode (m-AgSAE) were used for the determination of trace amounts of carcinogenic2-nitrobiphenyl (2-NBP) and 4-nitrobiphenyl (4-NBP) in buffered aqueous-methanolic solutions (for 2-NBP: 0.01 mol L LiOH (pH 12.0) methanol (9:1), for 4-NBP: 0.25 mol L acetate buffer (AB)of pH 4.8 methanol (7:3)). Both nitrobiphenyls (NBPs) can be determined by DCV and DPV in the concentration range 0.2 100 mol L (limit of quantification (LQ) of both NBPs for DCV is 0.2 mol L , LQ of 2-NBP and 4-NBP for DPV is 0.1 and 0.2 mol L , respectively). An attempt todecrease the LQ using DPAdSV was not successful, probably due to some competitive adsorption.The optimal medium for the simultaneous determination of 2-NBP and 4-NBP by DPV atthe m-AgSAE was: 0.10 mol L AB of pH 6.0 methanol (7:3). The dependences of the peak current on the concentration of individual NBPs in the mixture were linear in the 10 and 10 mol L concentration ranges. The practical applicability of the newly developed methods was verified usingmodel samples of drinking and river water.
机译：汞弯月形修饰银固体汞齐电极（m-AgSAE）上的直流伏安法（DCV），差分脉冲伏安法（DPV）和差分脉冲吸附溶出伏安法（DPAdSV）用于测定痕量致癌物2-硝基联苯（2- NBP）和4-硝基联苯（4-NBP）在甲醇缓冲水溶液中（对于2-NBP：0.01 mol L的LiOH（pH 12.0）甲醇（9：1），对于4-NBP：0.25 mol L的乙酸盐缓冲液（AB pH 4.8的甲醇（7：3））。两种硝基联苯（NBP）可以通过DCV和DPV在0.2 100 mol L的浓度范围内确定（DCV的两种NBP的定量限（LQ）为0.2 mol L，DPV的2-NBP和4-NBP的LQ为0.1和分别为0.2 mol L）。使用DPAdSV降低LQ的尝试未成功，可能是由于竞争性吸附。在m-AgSAE上用DPV同时测定2-NBP和4-NBP的最佳培养基是：0.10 mol L AB pH 6.0甲醇（ 7：3）。峰值电流对混合物中各个NBP浓度的依赖性在10和10 mol L的浓度范围内呈线性关系。使用饮用水和河水的模型样本验证了新开发方法的实际适用性。

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