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Square-wave voltammetric determination of paraquat at carbon paste electrode modified with hydroxyapatite

机译：羟基磷灰石修饰碳糊电极上方波伏安法测定百草枯

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摘要

The voltammetric behavior of paraquat was investigated at hydroxyapatite-modified carbon paste electrode HAPCPE in K2SO4. A method was developed for the detection of the trace of this herbicide, based on their redox reaction. The reduction peaks of paraquat were observed around - 0.70 V and - 1.00 V (vs. SCE) in square-wave voltammetry. Experimental conditions were optimized by varying the accumulation time, apatite loading and measuring solution pH. Calibration plots were linear under the optimized parameters over the herbicide's concentration range 8-200 x 10(-7) mol L-1, with a detection and quantification limits about 1.5 x 10(-8) mol L-1 and 6.4 10(-8) mol L-1, respectively.
机译：研究了百草枯在羟基磷灰石修饰的碳糊电极HAPCPE中在K2SO4中的伏安行为。根据氧化还原反应，开发了一种检测痕量除草剂的方法。在方波伏安法中，在-0.70 V和-1.00 V（相对于SCE）附近观察到百草枯的还原峰。通过改变积累时间，磷灰石负载量和测量溶液pH值来优化实验条件。在除草剂浓度范围为8-200 x 10（-7）mol L-1的优化参数下，校准图呈线性，检测和定量限分别为1.5 x 10（-8）mol L-1和6.4 10（- 8）分别为mol L-1。

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