Rapid and accurate determination of gold in geological materials by an improved ICP-MS method

Tao, Danyang; Guo, Wei; Xie, Wenke; Liu, Jin; Guo, Qinghai; Hu, Shenghong

doi:10.1016/j.microc.2017.09.014

Cited by 26 publications

(19 citation statements)

References 24 publications

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“…Until now, the widely used Au test methods include titration (Stefano et al 2015), atomic absorption spectrometry (Yilmaz and Soylak 2014;Choi et al 2017;Zhou et al 2017;Tang et al 2019), inductively coupled plasma optical emission spectroscopy (George and Konstantinos 2016;Hassan et al 2016;Xue et al 2016), microwave plasma atomic emission spectrometry (Balaram et al 2013), and inductively coupled plasma mass spectrometry (ICP-MS) (Liu et al 2013;Tao et al 2017;Satyanarayanan et al 2018;Chen et al 2019). Among them, ICP-MS meets the test conditions of most geological samples and has the advantages of low detection limit, high sensitivity, and wide linear range (Qi et al 2011;Resano et al 2012;Yim et al 2012;Strnad et al 2016;Berezhnaya and Dubinin 2017).…”

Section: Introductionmentioning

confidence: 99%

“…This method combined the ion-molecule reaction ICP-MS and methane plasma modifier technique, thereby reduced the interference of 181 Ta 16 O + and 180 Hf 16 OH + on 197 Au by three orders of magnitude, decreased the background signal to 50%, and increased the Au sensitivity by 4 times. Then, the method was improved by Ar aerosol dilution ICP-MS after aqua regia extraction in 2017 (Tao et al 2017). The background signal originating from the interfering residual oxide and/or hydroxides ions was further reduced by up to 60%.…”

Section: Introductionmentioning

confidence: 99%

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Gold determination in soil by ICP-MS: comparison of sample pretreatment methods

Tang

et al. 2020

J Anal Sci Technol

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At present, the direct gold determination in geological samples by inductively coupled plasma mass spectrometry (ICP-MS) is still an arduous challenge due to both spectral and background interferences. It is very important and necessary to study the pretreatment processes; therefore, the polyurethane foam treatment and sample digestion methods are explored and compared here. The experimental results showed that the gold adsorption rate of treated foam was significantly improved as the impurities in the foam were cleaned up, and the potential difference of the liquid membrane was increased. Meanwhile, the combination of the foam enrichment and thiourea desorption achieved the selective adsorption and desorption of gold ions, eliminated the interference of coexisting ions, and perfected the detection limits. Compared with the traditional electric heating plate digestion method, microwave digestion, a closed digestion method, had the advantages of less sample and reagent dosage, short time consumption, high degree of automation, thorough digestion, good security, and environmental friendliness and met the requirements of green chemistry development. The proposed microwave digestion-foam enrichment-thiourea desorption-ICP-MS determination method was applied to the gold test in soil samples of the actual gold mining area. It has the great potential as a routine laboratory procedure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gold determination in soil by ICP-MS: comparison of sample pretreatment methods

Tang

et al. 2020

J Anal Sci Technol

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“…At the same time, the test methods will also have a certain impact on the experimental results. Commonly used gold test methods include titration [21], atomic absorption spectrometry (AAS) [20, 22–24], inductively coupled plasma optical emission spectroscopy [25, 26], and inductively coupled plasma mass spectrometry [27, 28]. Among them, the AAS meets the test conditions of most geological samples, and its analytical techniques are relatively mature and widely used [29–32].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Two Pretreatment Processes for Chemical Phase Analysis of Gold in Geological Samples by Atomic Absorption Spectrometry

Tang

Liu

et al. 2019

Journal of Analytical Methods in Chemistry

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Sample pretreatment is important for chemical phase analysis of elements. In this study, the geological samples of the Laozuoshan gold mine are chosen to pretreat by ultrasonic centrifugation and cyclotron oscillation, and the content of gold in eight chemical phases (water-soluble, ion exchange and clay adsorption, organic matter bound, iron-manganese oxide bound, naked or seminaked, carbonate bound, sulfide bound, and insoluble silicate states) is determined by atomic absorption spectrometry. The results show that the gold content of water-soluble, ion exchange and clay adsorption, iron-manganese oxide, and naked or seminaked states in the rock and ore samples is low, and some samples have high gold content of insoluble silicate states in the two methods. However, the gold content of organic matter bound, carbonate bound, and sulfide bound states obtained by ultrasonic centrifugation and cyclotron oscillation methods is significantly different. According to the X-ray fluorescence spectrometry data and the actual geological condition, the result given by the cyclotron oscillation method is more reasonable. The gold content of sulfide bound state in sediment samples is the highest and consistent with the mineral information, which could be applied to preliminarily predict the rock and ore conditions in the corresponding mining areas. In contrast with ultrasonic centrifugation, the cyclotron oscillation method has the advantages of simplicity, high efficiency, practicality, and environmental protection, and it can be better used for the determination of gold chemical phase state in geological samples by atomic absorption spectrometry.

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“…Sophisticated analytical techniques including inductively coupled plasma-mass spectrometry (ICP-MS), [1][2][3][4] inductively coupled plasma optical emission spectrometry (ICP-OES), 5,6 neutron activation analysis (NAA), 3,7,8 X-ray uorescence (XRF), 9 and atomic absorption spectrometry (AAS) 10-14 enable sensitive and selective determination of trace amounts of Ag(I) and Au(III) in a wide range of matrices. However, conventional spectrophotometry stands out as a relatively low cost, simple and easyto-use technique.…”

Section: Introductionmentioning

confidence: 99%