茜素红-S螯合形成树脂吸附测定地质样品的金、铂和钯

以茜素红-S(1,2-二羟基蒽醌-3-磺酸钠)为螯合剂，与大孔强碱性阴离子树脂D296-R合成茜素红-S螯合形成树脂，能够在酸性介质中使螯合形成树脂中的-OH离解出H⁺，变成-O-，与大体积的贵金属碘络阴离子MeI4]^2-相遇形成稳定的螯合物。在较宽的酸度范围内使Au、Pt、Pd与贱金属有效分离，并抑制NO3^-对贵金属吸附的影响。与高压密闭溶矿方式相结合，Au、Pt、Pd的回收率均大于92%，检出限:Au 0.047 ng/g、Pt 0.082 ng/g、Pd 0.051 ng/g。应用于铂族元素地球化学成分分析一级标准物质中Au、Pt、Pd的测定，结果与认定值的相对误差(RE)为-7.58% ~10.9%，相对标准偏差(RSD)均小于9.86%。

Determination of Gold, Platinum and Palladium in Geological Samples Adsorbed by Alizarin Red-S Chelate Forming Resin

A new type of alizarin red-S chelating resin was synthesized by chelating alizarin red-S (1,2-dihydroxyanthraquinone-3-sulfonic acid sodium) with macroporous strong basic anion resin D296-R. The chelating resin can dissociate -OH into H⁺ in acidic medium and turn into -O-, which can coordinate with large precious metal iodine complex anion MeI4]^2- to form a stable chelate. Au, Pt and Pd in samples can effectively be separated from base metals in a wide acidity range, and the effect of NO3^- on the adsorption of precious metals can be inhibited. Combined with a high-pressure closed dissolved ore method, the recovery rates of Au, Pt and Pd were more than 92%, and the detection limits were 0.047, 0.082 and 0.051 ng/g for Au, Pt and Pd, respectively. It is applied to the determination of Au, Pt and Pd in the primary reference materials for the geochemical composition analysis of platinum group elements, the relative error (RE) between the results and the identified values was -7.58%~10.9%, and the relative standard deviation (RSD) was less than 9.86%.