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

Rock and Mineral Analysis > 2021 > 40(5): 650-658. > DOI: 10.15898/j.cnki.11-2131/td.202105060058

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

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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

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Received Date: May 05, 2021
Revised Date: June 28, 2021
Accepted Date: August 27, 2021
Published Date: September 27, 2021

Abstract

HIGHLIGHTS
(1) The phosphate precipitation method separated most of the interfering elements of niobium and zirconium from the analyzed element silver, which eliminated the mass spectrum interference in the determination of silver by ICP-MS.

(2) ¹⁰⁶Pd was used to correct the interference of ⁹¹Zr¹⁶O⁺ and ⁹⁰Zr¹⁶O¹H⁺ on ¹⁰⁷Ag.

(3) A method for the determination of trace silver in geochemical samples by ICP-MS was developed with four acid dissolution andphosphate precipitation.

ABSTRACT

BACKGROUNDStandard 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.
OBJECTIVESTo develop a method for the determination of trace Ag in geochemical samples.
METHODSCommon sample digestion methods and chemical separation (ion exchange separation) were introduced in detail and were discussed in this paper.
RESULTSAs 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.
CONCLUSIONSThis 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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