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首页> 外文期刊>Electroanalysis >Electrocatalytic determination of colloidal gold particles using a carbon paste electrode pretreated in cyanide media
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Electrocatalytic determination of colloidal gold particles using a carbon paste electrode pretreated in cyanide media

机译：使用氰化物介质预处理的碳糊电极电催化测定胶体金颗粒

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A new methodology, based on silver electrocatalytic deposition and designed to quantify colloidal gold adsorbed onto carbon paste electrodes, has been developed in this work. Silver (contained in 1.0M NH3) electrodeposition at -0.18V only occurs when oxidized colloidal gold is attached to the electrode. Adequate oxidation of gold particles is necessary, and it was carried our in 0.1 M H2SO4 at +1.35V. In order to use the same electrode for several assays, a cleaning step in KCN, which removes colloidal gold from the electrode surface, was included. To obtain reproducibility in the analytical signal, the electrode surface must be suitably pretreated; cyanide ions were also used for this purpose. Finally, a very low detection limit (250 gold particles muL(-1)) was achieved with this novel methodology. [References: 23]
机译：在这项工作中，开发了一种新的方法，该方法基于银的电催化沉积，旨在量化吸附到碳糊电极上的胶体金。仅在将氧化的胶体金附着到电极上时，才会在-0.18V处进行银（含1.0M NH3）电沉积。金颗粒必须充分氧化，并且必须在+ 1.35V的0.1 M H2SO4中进行。为了将同一电极用于几种测定，还包括了KCN中的清洁步骤，该步骤可以从电极表面去除胶体金。为了获得分析信号的重现性，必须对电极表面进行适当的预处理。氰离子也用于此目的。最终，使用这种新颖的方法实现了非常低的检测限（250个金颗粒muL（-1））。 [参考：23]

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