Determination of Trace Silver in Geochemical Samples by Inductively Coupled Plasma-Mass Spectrometry with Phosphoric Acid Precipitation Separation

LIU Tong-tong; QIANG Yin-di; HUANG Deng-li

doi:10.15898/j.cnki.11-2131/td.202105060058

2021 Vol. 40, No. 5

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LIU Tong-tong, QIANG Yin-di, HUANG Deng-li. Determination of Trace Silver in Geochemical Samples by Inductively Coupled Plasma-Mass Spectrometry with Phosphoric Acid Precipitation Separation[J]. Rock and Mineral Analysis, 2021, 40(5): 650-658. doi: 10.15898/j.cnki.11-2131/td.202105060058

Citation:

LIU Tong-tong, QIANG Yin-di, HUANG Deng-li. Determination of Trace Silver in Geochemical Samples by Inductively Coupled Plasma-Mass Spectrometry with Phosphoric Acid Precipitation Separation[J]. Rock and Mineral Analysis, 2021, 40(5): 650-658. doi: 10.15898/j.cnki.11-2131/td.202105060058

Determination of Trace Silver in Geochemical Samples by Inductively Coupled Plasma-Mass Spectrometry with Phosphoric Acid Precipitation Separation

1.
Zhangye Geo-Mine Survey Institute, Non-Ferrous Metal Geological Exploration Bureau of Gansu Province, Zhangye 734000, China
2.
Lanzhou Geo-Mine Survey Institute, Non-Ferrous Metal Geological Exploration Bureau of Gansu Province, Lanzhou 730030, China

Received Date: 06 May 2021

Revised Date: 29 June 2021

Accepted Date: 28 August 2021

Publish Date: 28 September 2021

Abstract

Abstract

BACKGROUND
Standard mode with interference correction or kinetic energy discrimination mode is commonly used for the determination of trace silver in geochemical samples by inductively coupled plasma-mass spectrometry (ICP-MS). Interference of both stable isotopes of silver occurs in the mass spectrum of the oxides or hydroxides of zirconium and niobium. Moreover, for samples with a higher content of interfering elements and a lower content of silver, the determination accuracy is low, requiring separation of the interfering element from silver in the solution.
OBJECTIVES
To develop a method for the determination of trace Ag in geochemical samples.
METHODS
Common sample digestion methods and chemical separation (ion exchange separation) were introduced in detail and were discussed in this paper.
RESULTS
As proved by first grade standard materials, the result was consistent with standard recommended values, with the relative standard deviation of 4.3%-12.1% (n=12). The detection limit (3SD) of the method was 0.0072μg/g.
CONCLUSIONS
This method is suitable for the determination of trace silver in soil, stream sediment and rock samples. The introduction of phosphoric acid does not affect the determination of other conventional elements, and the same digestion solution can be used to determine Ag and other elements.
- trace silver /
- inductively coupled plasma-mass spectrometry /
- geochemical samples /
- phosphate precipitation

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References

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