报道了利用一次溶样和同一化学流程分离富集地质样品中铂族元素(Pt、Pd、Os、Ir 和Ru)和Re 的 方法。该化学流程包括以下几个步骤: (1) Carius 管溶样法分解岩石样品中富集铂族元素的矿物; (2) 四氯化碳萃取法分离出Os; (3) 微蒸馏法进一步纯化Os; (4) 阳离子交换树脂法将铂族元素(Pt、Pd、Ir 和Ru)以及Re 与主要的基体阳离子分离; (5) 利用“钽试剂”螯合树脂将干扰元素(Zr、Hf、Mo 和W 等)分离。铂族元素(Pt、Pd、Ir 和Ru)以及Re 的含量采用同位素稀释-电感耦合等离子体质谱法(ID-ICPMS)测定, Os 含量和同位素组成利用同位素稀释-热电离质谱(ID-TIMS)测定。对国际岩石标准橄榄岩(WPR-1)和玄武岩(BHVO-2)的重复分析测定结果表明, 测定结果与参考值吻合。
Here we report a chemical procedure for separating platinum group elements (PGEs, Os, Ir, Pt, Pd, Ru) and Re using a single sample digestion. The procedure consists of the following five steps: (1) sample dissolution via Carius tube technique; (2) separation of Os from the PGEs and Re and other matrix elements using CCl4 solvent extraction; (3) purification of Os using micro-distillation method; (4) separation of PGEs and Re from other matrix elements on cation exchange resin; (5) the interference elements, such as Zr, Hf, Mo and W, were separated from the PGEs and Re fraction solution by “BPHA” chelated resin. The concentrations of PGEs (Pt, Pd, Ru and Ir) and Re were determined by isotope dilution-inductively coupled plasma mass spectrometry (ID-ICPMS); the abundance and isotopic composition of Os were measured using isotope dilution-negative thermal ionization mass spectrometry (ID-NTIMS). The analytical results of PGEs and Re-Os isotopic system for international rock reference materials show good agreement with previous reported data.