Determination of Platinum, Palladium and Gold in Geological Samples by Bomb-inductively Coupled Plasma-Mass Spectrometry with Concentrate and Extraction by Mixed Adsorbent

Lin WANG; Zhi-zhong TANG; Xin-ze LAI; Wen-li LIAN; Jia-zhen HU; Lan ZHOU

2013 Vol. 32, No. 3

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Article navigation > Rock and Mineral Analysis > 2013 > 32(3): 420-426

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Lin WANG, Zhi-zhong TANG, Xin-ze LAI, Wen-li LIAN, Jia-zhen HU, Lan ZHOU. Determination of Platinum, Palladium and Gold in Geological Samples by Bomb-inductively Coupled Plasma-Mass Spectrometry with Concentrate and Extraction by Mixed Adsorbent[J]. Rock and Mineral Analysis, 2013, 32(3): 420-426.

Citation:

Determination of Platinum, Palladium and Gold in Geological Samples by Bomb-inductively Coupled Plasma-Mass Spectrometry with Concentrate and Extraction by Mixed Adsorbent

1.
Henan Province Rock & Mineral Testing Centre，Zhengzhou 450012, China
2.
Key Laboratory of Precious Metals Analysis and Exploration Technology，Ministry of Land and Resources, Zhengzhou 450012, China
3.
Qinghai Province Geology Ore Test Application Centre，Xining 810008，China

Received Date: 27 March 2012

Accepted Date: 18 January 2013

Abstract

Abstract

Fire assay separation enrichment technology has been applied to precious metals analysis, however, its ingredients are complex, time-consuming, analysis costs are relatively high and blank controls are more difficult. A new method was set up such as the samples were dissolved with H₂O₂-HCl before Pt, Pd and Au were determined by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). In 10% hydrochloric acid solution, LSC-400 mercapto resin and activated carbon were mixed as the adsorbent. Pt，Pd and Au in the sample solution were separated and enriched by using dynamic adsorption. Lu was selected as the internal standard element to eliminate non-spectral interference and spectrum interference along with tracers of ¹⁹⁵Pt, ¹⁹⁷Au and ¹⁰⁸Pd. The recovery rates of each element were more than 96.4%. The detection limits were 0.06 ng/g for Pt, 0.08 ng/g for Pd and 0.12 ng/g for Au. Compared with the detection limits, this established method was better than the fire assaying method and other separation and enrichment methods. The method has been applied to the determination of these elements in National Standard Materials for PGEs and results were in agreement with the certified values. The relative standard deviations (RSD, n=12) was less than 16.1%. The method is simple, low cost and greatly improves the speed of analysis，and effectively reduces the blanks of the chemical processing.
- geological samples /
- platinum /
- palladium /
- gold /
- LCS-400 sulfhydryl resin /
- composite adsorbent /
- Inductively Coupled Plasma-Mass Spectrometry

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References

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