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首页> 外文期刊>Electroanalysis >Determination of labile cadmium using a screen-printed electrode modified by a microwell
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Determination of labile cadmium using a screen-printed electrode modified by a microwell

机译：用微孔修饰的丝网印刷电极测定不稳定的镉

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A microwell has been deposited on the working surface of a screen-printed electrode in order to reduce the sample volume from 10 mL to 200 mu L for trace metal analysis in square wave anodic stripping voltammetry. It has been shown that the sample volume reduction did not affect the sensitivity. A detection limit of 2 x 10(-9) mol L-1 of Cd was established with these modified sensors for a preconcentration time of 60 s without stirring. Also it has been shown that pH ranging from 4 to 7 did not affect the sensor sensitivity. These modified sensors were able to run at neutral pH in real samples, such as soil solutions, containing higher organic carbon concentration and thus offered a first and rapid approach of Cd speciation.
机译：为了在方波阳极溶出伏安法中进行痕量金属分析，将微孔沉积在丝网印刷电极的工作表面上，以将样品体积从10 mL减少到200μL。已经表明，样品体积的减少不会影响灵敏度。用这些改进的传感器在不搅拌的情况下，在60 s的预浓缩时间内建立了2 x 10（-9）mol L-1的Cd检测限。还显示出pH范围为4至7不会影响传感器的灵敏度。这些经过修改的传感器能​​够在含有较高有机碳浓度的真实样品（例如土壤溶液）中以中性pH值运行，因此提供了第一种快速的Cd形态形成方法。

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