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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >The separation of platinum, palladium and gold from silicate rocks by the anion exchange separation of chloro complexes after a sodium peroxide fusion: an investigation of low recoveries
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The separation of platinum, palladium and gold from silicate rocks by the anion exchange separation of chloro complexes after a sodium peroxide fusion: an investigation of low recoveries

机译：过氧化钠熔融后氯配合物的阴离子交换分离从硅酸盐岩中分离铂，钯和金的研究：低回收率的研究

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摘要

A series of experiments was undertaken to measure the recovery efficiency of platinum, palladium and gold from silicate rocks using a sodium peroxide fusion followed by anion exchange separation of the analytes as chloro complexes. Results obtained bygraphite furnace atomic absorption spectrometric analysis of standard solutions prepared in dilute HC1 or HCl-acidified sodium peroxide solution showed that recoveries were near quantitative. However, when standard solutions were added to an alkaline sodium peroxide solution, which was then acidified, low results were obtained for platinum and gold (46% and 76% respectively). Low and variable results were also obtained when standard solutions were added to a peridotite sample that had been dissolved bythe state procedure, and in the analysis of the South African Bureau of Standards certified reference material, SARM 7. Various experiments were undertaken to investigate these low recoveries, but the reason proposed here is the formation of hydroxychloro compounds in alkaline solution which are not, on acidification with HC1, converted quantitatively to the chloro complex necessary for quantitative anion exchange separation. It is concluded that a sodium peroxide fusion followed by an anion-excharigeseparation does not appear to form the basis of a successful technique for the determination of platinum, palladium and gold in silicate rocks.
机译：进行了一系列实验，使用过氧化钠熔融法然后通过阴离子交换分离作为氯配合物的分析物，从硅酸盐岩石中测量铂，钯和金的回收率。通过在稀HCl或HCl酸化的过氧化钠溶液中制备的标准溶液的石墨炉原子吸收光谱分析获得的结果表明，回收率接近定量。但是，当将标准溶液添加到碱性过氧化钠溶液中然后进行酸化时，铂和金的结果较低（分别为46％和76％）。将标准溶液添加到按状态程序溶解的橄榄岩样品中，并且在分析南非标准局认证的参考材料SARM 7中，也得到了较低且可变的结果。回收率高，但是这里提出的原因是在碱性溶液中形成羟氯化合物，这些化合物在用HCl酸化时并未定量转化为定量阴离子交换分离所必需的氯配合物。结论是，过氧化钠熔融后进行阴离子离析似乎并未形成测定硅酸盐岩石中铂，钯和金的成功技术的基础。

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