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首页> 外文期刊>Electroanalysis >Flow injection analysis of maleic hydrazide using an electrochemical sensor based on palladium-dispersed carbon paste electrode
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Flow injection analysis of maleic hydrazide using an electrochemical sensor based on palladium-dispersed carbon paste electrode

机译：基于钯分散碳糊电极的电化学传感器对马来酰肼的流动注射分析

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摘要

A new analytical methodology for the electrochemical detection of the herbicide maleic hydrazide (3,6-dihydroxypyridazine) by flow injection analysis is presented. This method is supported by the novel application of a palladium-dispersed carbon paste electrode as an amperometric sensor for this herbicide. Maleic hydrazide shows anodic electrochemical activity on carbon-based electrodes (glassy carbon or carbon paste electrodes) in all the pH range. This electrochemical activity is enhanced using metal-dispersed carbon paste electrodes, especially at Pd-dispersed CPE which displays good oxidation signals at 690 mV (0.050 M phosphate buffer pH 7.0), 140 mV lower than at unmodified electrodes. Under the optimized conditions, the electroanalytical performance of Pd-dispersed CPE in flow injection analysis was excellent, with good reproducibility (RSD 3.3%) and a wide linear range (1.9 x 10(-7) to 1.0 x 10(-4) mol L-1). A detection limit of 1.4 x 10(-8) mol L-1 (0.14 ng maleic hydrazide) was obtained for a sample loop of 100 mu L at a fixed potential of 700 mV in 0.050 M phosphate buffer solution at pH 7.0 and a flow rate of 2.0 mL min(-1). The proposed method was applied for the maleic hydrazide detection in natural drinking water samples.
机译：提出了一种通过流动注射电化学检测除草剂顺丁烯二酰肼（3,6-二羟基哒嗪）的新分析方法。钯分散碳糊电极作为该除草剂的安培传感器的新应用为该方法提供了支持。在所有pH范围内，马来酰肼在碳基电极（玻璃碳或碳糊电极）上均显示出阳极电化学活性。使用金属分散的碳糊电极可以增强这种电化学活性，特别是在Pd分散的CPE上，该电极在690 mV（0.050 M磷酸盐缓冲液pH 7.0）下显示出良好的氧化信号，比未修饰的电极低140 mV。在最佳条件下，Pd分散CPE在流动注射分析中的电分析性能优异，重现性好（RSD 3.3％），线性范围宽（1.9 x 10（-7）至1.0 x 10（-4）mol） L-1）。在pH值为7.0的0.050 M磷酸盐缓冲溶液中，以700 mV的固定电位在100 m L的定量环中，获得的检出限为1.4 x 10（-8）mol L-1（0.14 ng马来酰肼）。速度为2.0 mL min（-1）。该方法用于天然饮用水中马来酰肼的检测。

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