Preparation of Trace Gold and Gold Ore Reference Materials

YANG Rong; YINGang-wei; ZHANG Ju-xia; PAN Han-jiang

doi:10.15898/j.cnki.11-2131/td.202106110005

Rock and Mineral Analysis > 2021 > 40(5): 751-762. > DOI: 10.15898/j.cnki.11-2131/td.202106110005

YANG Rong, YINGang-wei, ZHANG Ju-xia, PAN Han-jiang. Preparation of Trace Gold and Gold Ore Reference Materials[J]. Rock and Mineral Analysis, 2021, 40(5): 751-762. DOI: 10.15898/j.cnki.11-2131/td.202106110005

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Preparation of Trace Gold and Gold Ore Reference Materials

1.
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Science, Langfang 065000, China
2.
Hebei Geological Workers University, Shijiazhuang 050000, China

More Information

Received Date: June 10, 2021
Revised Date: July 19, 2021
Accepted Date: August 27, 2021
Published Date: September 27, 2021

Abstract

HIGHLIGHTS
(1) Seven trace gold and three ore gold geochemical reference materials were copied, and the RSD of the fixed components was less than 6%, with good standard value and uncertainty.

(2) The uncertainty of the standard value was composed of uniformity, stability and fixed value.

(3) The standard deviation of this series of gold reference materials was smaller than that of the original batch, and the fixed value level was better than that of the original batch, which met the requirements of reference material replication.

(4) This series of gold standard materials covered a wide content range (0.87ng/g-51.8μg/g), which can effectively monitor the whole process of sample analysis in each stage of gold exploration and development.

ABSTRACT

BACKGROUNDFrom 1986 to 2007, different grades of trace gold certified reference materials (background grade, anomaly grade, medium grade and high grade) and mineral gold certified reference materials (mineralization grade, cutoff grade and concentrate grade) had been developed by IGGE and used for regional geochemical survey, mineral exploration and evaluation, mining and smelting. With the increase of the service life period and the consumption of recent years, most of the gold certified reference materials has been used up or almost used up. New gold standard materials need to be developed urgently.
OBJECTIVESTo develop a new gold certified reference material and compare it with the original gold certified reference material.
METHODSThe trace gold certified reference materials in 7 levels and mineral gold certified reference materials in 3 levels were prepared in strict accordance with relevant specifications. The collected candidates were sampled from different types of deposits and different matrices. The collected candidates were prepared through coarse crushing, drying, composite configuration, fine crushing, sieving, blending and other steps. After the particle size inspection, the cumulative content of the sample with a particle size of 0.74μm reached more than 99%, which met the requirements of the specifications. 25 bottle samples of each grade were randomly selected. Homogeneity testing was carried out by ICP-MS, FAAS and GFAAS.
RESULTSThe relative standard deviation (RSD) was less than 10%, and the F values of the variance test were less than the one-tailed critical value F_{0.05(24, 25)} of 1.98, indicating that the sample uniformity was good. During the one-year investigation period, no significant changes in statistical significance were found in the fixed value components, which proved that the stability of the sample was good. Five highly experienced and skilled laboratories in geology gold samples testing in CHN were invited to evaluate the gold certified reference materials by classically reliable analytical methods. The original data conformed to the normal distribution after statistical inspection and the suspicious values were eliminated. The arithmetic mean was used as the standard value, and the uncertainty was evaluated in detail, in accordance with the latest specifications. The certified value of the copied standard material was accurate and reliable, and the uncertainty was reasonable. It was approved as a national first-level standard material in 2019. Compared with the original batch, the certified values of the two batches were basically the same, and the standard deviation of the fixed value data showed a shrinking trend, which met the requirements for copying standard materials.
CONCLUSIONSThis series of gold standard materials has a wide content range, and meets the value comparison and analysis monitoring of different content levels. Moreover, it has good applicability, and meets the needs of geological and mineral research, regional geochemical investigation, gold mine exploration and evaluation.
- certified reference materials,
- trace gold,
- gold ore,
- replication,
- inductively coupled plasma-mass spectrometry,
- atomic absorption spectrometry

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