CARIUS TUBE DIGESTION FOR LOW-BLANK RHENIUM-OSMIUM ANALYSIS

被引：904

作者：

SHIREY, SB ^{[1
]}

WALKER, RJ ^{[1
]}

机构：

[1] UNIV MARYLAND,DEPT GEOL,ISOTOPE GEOCHEM LAB,COLLEGE PK,MD 20742

来源：

ANALYTICAL CHEMISTRY | 1995年 / 67卷 / 13期

关键词：

D O I：

10.1021/ac00109a036

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A relatively high-temperature oxidizing digestion using aqua regia has been developed for <0.1-5 g size samples of various types of rocks including silicates, sulfides, and metals prior to Re-Os isotopic analysis. Reactions are accomplished in sealed, thick-waded Pyrex tubes (Carius tubes) at 240 degrees C and elevated pressures for similar to 12 h. This digestion technique dissolves platinum-group element minerals, metals, and sulfides and evidently sufficiently reacts with silicates to release most or all Re and Os contained in a silicate matrix. The procedure also leads to the oxidation of Re and Os to their highest valences and, therefore, promotes the complete chemical equilibration of sample Re and Os with enriched isotopes of Re and Os that are added for isotope dilution analysis. Once sample digestion and equilibration are complete, subsequent Os separation is accomplished by conventional double distillation from sulfuric acid, and Re is separated by anion exchange chromatography. Comparison of conventional Tenon vessel digestions and Carius tube digestions for a diverse suite of geological samples shows that the Carius tube digestion both liberates more Os from most matrices and also is a much more robust method for reproducibly measuring the isotopic composition of a sample.

引用

页码：2136 / 2141

页数：6

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