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首页> 外文期刊>International journal of environmental analytical chemistry >Wide linear range nanomaterial/ionophore-based electrode used for determination of lead in environmental and biological samples with differential pulse voltammetry
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Wide linear range nanomaterial/ionophore-based electrode used for determination of lead in environmental and biological samples with differential pulse voltammetry

机译：宽线性范围的纳米材料/离子载体基电极，用于通过差分脉冲伏安法测定环境和生物样品中的铅

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摘要

A new chemically modified carbon paste electrode is fabricated to determine lead ion concentration in its trace level in aqueous media with differential pulse voltammetry (DPV). The best performance is obtained by the carbon paste electrode composition including 20% of dithiodibezoic acid (DDA), 80% of high purity graphite powder and 60 uL of colloidal gold nanoparticle (AuNP) solution. The proposed electrode has a wide linear calibration response from 1 × 10~(-9) to 6 × 10~(-5) M with a detection limit of 6.6 × 10~(-10)M, at pH 3.5. Seven replicate determination of 5 × 10~(-8)M of lead ion concentration gives a relative standard deviation of 3.33%. The modified sensor is applied to determine lead contents in some environmental and biological Samples with satisfactory results.
机译：制造了一种新的化学修饰的碳糊电极，用差分脉冲伏安法（DPV）测定水溶液介质中痕量铅离子的浓度。碳糊电极组合物包含20％的二硫代二苯甲酸（DDA），80％的高纯度石墨粉和60 uL胶体金纳米颗粒（AuNP）溶液，可获得最佳性能。所提出的电极在1×10〜（-9）到6×10〜（-5）M的线性校正范围很宽，在pH 3.5时检测极限为6.6×10〜（-10）M。七次重复测定铅离子浓度为5×10〜（-8）M，得出的相对标准偏差为3.33％。改进的传感器用于测定某些环境和生物样品中的铅含量，结果令人满意。

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