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Issue 4, 2010
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An improved Carius tube technique for determination of low concentrations of Re and Os in pyrites

Liang Qi,*a  Mei-Fu Zhou,b  Jianfeng Gaob  and  Zheng Zhaoa 
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* Corresponding authors

a State Key Lab of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
E-mail: qilianghku@hotmail.com

b Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China

Abstract

A simple and highly selective analytical method is developed for Re–Os dating in hydrothermal pyrites. Pyrites were first digested with HNO3 in a 120 ml Carius tube. The released additional gas and a small portion of volatile Os (∼6% of total Os) were collected by 10 mol l−1 of HCl in an ice-water bath. After the sulfides were totally reacted with HNO3, the HCl solution containing all the released Os was transferred back to the Carius tube. The sample was further digested in aqua regia at 200 °C for about 10 h in a sealed Carius tube. Because prior digestion in an open Carius tube removed the additional gas, this improved technique allows increasing the sample mass to about 3 g, which is vital for Re–Os dating in Re and Os poor hydrothermal pyrites. Os was separated from the matrix by distillation and Re by anion exchange resin. The results obtained for molybdenite reference materials, JDC and HLP mixed with 3 g pyrite are in good agreement with certified values. Despite very low concentrations of Re and Os, the pyrite yields excellent repeatability and can be used for Re and Os poor hydrothermal pyrites.

Graphical abstract: An improved Carius tube technique for determination of low concentrations of Re and Os in pyrites

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Publication details

The article was received on 15 Sep 2009, accepted on 11 Dec 2009 and first published on 08 Jan 2010


Article type: Technical Note
DOI: 10.1039/B919016C
Citation: J. Anal. At. Spectrom., 2010,25, 585-589
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    An improved Carius tube technique for determination of low concentrations of Re and Os in pyrites

    L. Qi, M. Zhou, J. Gao and Z. Zhao, J. Anal. At. Spectrom., 2010, 25, 585
    DOI: 10.1039/B919016C

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