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阳极溶出法为痕量元素分析提供了很灵敏的方法,并已被许多工作者应用于各种类型物质中铅的测定。本文提出,用悬汞电极脉冲阳极溶出法测定火成岩中的铅,无须预先萃取。选用盐酸羟胺为支持电解质。因为盐酸羟胺在酸性介质中具有还原能力,而在酸性介质中可以避免一些金属以氢氧化物形式沉淀从而产生共沉淀和吸附现象。同时,在此条件下还可以使一些待测元素的溶出峰很好地分开。盐酸羟胺还原Cu(Ⅱ)为Cu(Ⅰ),因而铜只有一个溶出峰。溶液
Anodic stripping provides a sensitive method for trace elemental analysis and has been used by many workers for the determination of lead in various types of materials. In this paper, the determination of lead in igneous rocks by pulsed anodic stripping method with hanging mercury electrode without pre-extraction. Use hydroxylamine hydrochloride as a supporting electrolyte. Since hydroxylamine hydrochloride has a reducing power in an acidic medium, some metals can be prevented from precipitating in the form of hydroxides in an acidic medium to cause coprecipitation and adsorption. At the same time, under these conditions it is also possible to separate well the elution peaks of some of the elements to be tested. Hydroxylamine hydrochloride reduces Cu (Ⅱ) to Cu (Ⅰ), so copper has only one dissolution peak. Solution