Comparative Determination of Mass Fractions of Elements with Variable Chalcophile Affinities in Geological Reference Materials with and without HF‐desilicification,Geostandards and Geoanalytical Research

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Comparative Determination of Mass Fractions of Elements with Variable Chalcophile Affinities in Geological Reference Materials with and without HF‐desilicification
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-04-22 , DOI: 10.1111/ggr.12328
Zongqi Zou ₁ , Zaicong Wang ₁ , Huai Cheng ₁ , Tao He ₁ , Yinuo Liu ₁ , Kang Chen ₁ , Zhaochu Hu ₁ , Yongsheng Liu ₁

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Desilicification elevates extraction of Re and platinum‐group elements (PGEs) from many geological reference materials (RMs), but the extent to which it affects less chalcophile elements has been investigated rarely. To further evaluate the effect of desilicification, mass fractions of elements with variable chalcophile affinities (In, Cd, Cu, Ag, S, Se, Te, Re and PGEs) in different RMs were obtained by isotope dilution and digestion procedures involving HF‐HNO₃ in bombs versus HNO₃‐HCl in Carius tubes. The results show that the extraction efficiencies of HF‐desilicification vary in different RMs and for different elements. HF‐desilicification led to a significant increase (30–70%) for In and Cd mass fractions in all analysed RMs, but it played a negligible role in other strongly chalcophile elements in many samples (e.g., UB‐N and WGB‐1). Noticeably, desilicification led to a 10–30% increase in the mass fractions of Cu, Ag, S, Se and Te in BHVO‐2 and BIR‐1a, but less so in BCR‐2. These results could be attributed mainly to the variable chalcophile affinities of elements and their relative budget in sulfides, alloys and silicates. Desilicification should thus be preferred to determine chalcophile elements for most samples, except in cases where they are negligibly hosted in silicates.

中文翻译：

具有和不具有HF去硅化作用的地质参考材料中可变亲硫亲和力元素的质量分数的比较测定

脱硅作用提高了从许多地质参考材料（RM）中提取Re和铂族元素（PGE）的能力，但很少研究其对硫族元素的影响程度。为了进一步评估去硅作用，通过同位素稀释和涉及HF-HNO的消化过程，获得了不同RM中具有亲硫亲和力可变的元素（In，Cd，Cu，Ag，S，Se，Te，Re和PGEs）的质量分数₃在炸弹与HNO ₃‐ Carius管中的HCl。结果表明，HF脱硅的萃取效率在不同的RM和不同的元素下有所不同。HF去硅化作用使所有分析过的RM中In和Cd的质量分数显着增加（30-70％），但在许多样品（例如UB-N和WGB-1）中，它在其他强嗜硫元素中的作用微不足道。值得注意的是，脱硅导致BHVO-2和BIR-1a中Cu，Ag，S，Se和Te的质量分数增加10-30％，而在BCR-2中则不然。这些结果可能主要归因于元素的亲硫族亲和力及其在硫化物，合金和硅酸盐中的相对预算。因此，对于大多数样品而言，应优先采用去硅化来确定亲硫元素，除非它们在硅酸盐中的含量可忽略不计。

更新日期：2020-04-22

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