Universität zu Köln

Cheng, Huai ORCID: 0000-0002-7748-2082, Wang, Zaicong ORCID: 0000-0002-3584-1673, Chen, Kang ORCID: 0000-0003-3148-8128, Zong, Keqing, Zou, Zongqi, He, Tao, Hu, Zhaochu, Fischer-Goedde, Mario and Liu, Yanhong (2019). High-precision Determination of Gold Mass Fractions in Geological Reference Materials by Internal Standardisation. Geostand. Geoanal. Res., 43 (4). S. 663 - 681. HOBOKEN: WILEY. ISSN 1751-908X

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Abstract

Determination of gold abundances in natural rock is critical for applications, but very challenging. Here, we report a method for determining gold with a very low mass fraction (> 0.01 ng g(-1)) in rocks. The method involves Carius tube digestion with reverse aqua regia, chromatographic separation to remove most of the sample matrix and measurement by high-sensitivity ICP-MS. The mono-isotopic element gold was quantified by external calibration using an internal standardisation of gold to platinum that was precisely determined by isotope dilution. The method is robust and the obtained results are indistinguishable (< 5-10%, 2s) from those independently obtained by a standard addition technique on the same solution. The results from reference materials TDB-1 and GPt-2 are consistent with the certified values and those determined by HF-aqua regia digestion, confirming the validity of the method. TDB-1 (n = 20), GPt-2 (n = 6), BHVO-2 (n = 9) and other mafic RMs are homogenous for gold (10-20%, 2s) at the 2 g test portion level; however, sample heterogeneity affects some RMs. Gold and platinum-group elements also display different extents of sample heterogeneity for different RMs. Given the homogeneity observed for TDB-1, GPt-2 and BHOV-2, they are recommended as well-suited RMs for inter-laboratory comparison studies of gold.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Cheng, Huai UNSPECIFIED orcid.org/0000-0002-7748-2082 UNSPECIFIED Wang, Zaicong UNSPECIFIED orcid.org/0000-0002-3584-1673 UNSPECIFIED Chen, Kang UNSPECIFIED orcid.org/0000-0003-3148-8128 UNSPECIFIED Zong, Keqing UNSPECIFIED UNSPECIFIED UNSPECIFIED Zou, Zongqi UNSPECIFIED UNSPECIFIED UNSPECIFIED He, Tao UNSPECIFIED UNSPECIFIED UNSPECIFIED Hu, Zhaochu UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer-Goedde, Mario UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Yanhong UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-134473
DOI:	10.1111/ggr.12284
Journal or Publication Title:	Geostand. Geoanal. Res.
Volume:	43
Number:	4
Page Range:	S. 663 - 681
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1751-908X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PLATINUM-GROUP ELEMENTS; GEOCHEMICAL REFERENCE SAMPLES; DILUTION ICP-MS; NIS FIRE-ASSAY; SIDEROPHILE ELEMENTS; ISOTOPE-DILUTION; TE COPRECIPITATION; PERIDOTITE MASSIFS; TRACE-ELEMENTS; UPPER-MANTLE Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13447