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地质样品组分复杂,各元素含量范围变化大,金、铂、钯存在量甚微。样品需经分离富集后测定。作者曾实验在磷酸介质中,用甲基异丁基酮萃取吸收法测定金。本文着重介绍在此基础上以双十二烷基二硫乙二酰二胺—石油醚—氯仿混合溶剂分别萃取钯和铂。本法避免了试样组分对金、铂、钯的影响,可测0.03克/吨金或钯,0.1克/吨铂,分析结果的变动系数:金为5,钯为6.2,铂为7.7。
Complex geological sample components, the range of changes in the content of various elements, gold, platinum, palladium present in small quantities. The sample to be determined after separation and enrichment. The author has experimented in phosphoric acid medium, with methyl isobutyl ketone extraction absorption method for the determination of gold. This article focuses on the basis of this, with dodecyl dithioerythritol - petroleum ether - chloroform mixed solvents were extracted palladium and platinum. This method avoids the impact of the sample components on gold, platinum, palladium, 0.03g / ton of gold or palladium, 0.1g / ton of platinum can be measured, the coefficient of variation of the analysis results: gold 5, palladium 6.2, platinum 7.7 .