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首页> 外文期刊>International journal of environmental analytical chemistry >Sensitive adsorptive stripping voltammetric method for direct determination of trace concentration of lead in the presence of cupferron in natural water samples
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Sensitive adsorptive stripping voltammetric method for direct determination of trace concentration of lead in the presence of cupferron in natural water samples

机译：灵敏的吸附溶出伏安法直接测定天然水样品中存在铜铁时的痕量铅

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摘要

This paper reports the use of an adsorptive voltammetric technique for Pb(Ⅱ) determination using cupferron as a selective complexing agent. After accumulation of the complex onto a hanging mercury drop electrode, the electrode potential was scanned with differential pulse modulation and the reduction current of lead was observed at about -0.5 V. Under optimum conditions (5 × 10~(-4)molL~(-1) cupferron concentration, O.l molL~(-1) acetate buffer (pH 5.5), adsorption at - 50mV for 30s) the detection limit was 5.1 × 10~(-10)molL~(-1). The relative standard deviation of five measurements for low lead concentration was 3.1%. The accuracy of the method was tested by analysing certified reference material (SPS-WW1 Waste Water). Finally, the method was successfully applied to the determination of Pb(Ⅱ) in river water samples without any pretreatments.
机译：本文报道了使用吸附伏安法以铜铁作为选择性络合剂测定Pb（Ⅱ）的方法。将络合物累积到悬挂的汞滴电极上后，用差分脉冲调制扫描电极电势，并在-0.5 V左右观察到铅的还原电流。在最佳条件下（5×10〜（-4）molL〜（ -1）铜铁试剂浓度，Ol molL〜（-1）醋酸盐缓冲液（pH 5.5），在-50mV吸附30s）的检测极限为5.1×10〜（-10）molL〜（-1）。低铅浓度的五次测量的相对标准偏差为3.1％。通过分析认证的参考物质（SPS-WW1废水）测试了该方法的准确性。最后，该方法无需任何预处理即可成功地用于测定河水样品中的Pb（Ⅱ）。

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