Simultaneous Determination of 28 Elements including Rare Earth Elements by ICP-MS with Five-Acid Dissolution

GONG Cang; DING Yang; LU Hai-chuan; BU Dao-lu; WANG Li-hua; XIONG Tao; ZHANG Zhi-xiang

doi:10.15898/j.cnki.11-2131/td.202011030136

Rock and Mineral Analysis > 2021 > 40(3): 340-348. > DOI: 10.15898/j.cnki.11-2131/td.202011030136

GONG Cang, DING Yang, LU Hai-chuan, BU Dao-lu, WANG Li-hua, XIONG Tao, ZHANG Zhi-xiang. Simultaneous Determination of 28 Elements including Rare Earth Elements by ICP-MS with Five-Acid Dissolution[J]. Rock and Mineral Analysis, 2021, 40(3): 340-348. DOI: 10.15898/j.cnki.11-2131/td.202011030136

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Simultaneous Determination of 28 Elements including Rare Earth Elements by ICP-MS with Five-Acid Dissolution

Applied Geology Research Center of China Geological Survey, Chengdu 611732, China

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Received Date: November 02, 2020
Revised Date: December 29, 2020
Accepted Date: March 23, 2021
Published Date: May 27, 2021

Abstract

HIGHLIGHTS
(1) Different types of geological samples were open dissolved with HCl-HNO₃-HF-HClO₄-H₂SO₄, and 28 elements including rare earth elements were determined simultaneously and accurately by ICP-MS.

(2) The problems of unstable determination results of volatile elements and incomplete dissolution of LREE in the dissolution of HCl-HNO₃-HF-HClO₄ were solved.

(3) The standard curve was drawn by the solution prepared by the simultaneous dissolution of the certified reference material and the sample, which can effectively eliminate the matrix effect.

ABSTRACT

BACKGROUNDThree acids and four acids dissolution methods are the two main dissolution methods for determination of rare earth, cobalt, hafnium, indium, manganese, niobium, tantalum, thallium, chromium, cadmium, gallium, germanium, vanadium and tin in geological samples by inductively coupled plasma-mass spectrometry (ICP-MS). However, the composition of geological samples is complex, the content of rare earth and other metal elements is low, and the properties of each element are different, which makes the measurement results of volatile elements such as vanadium, chromium, cadmium, gallium and tin unstable, and rare earth elements such as lanthanum, cerium, praseodymium and neodymium are not completely dissolved by three acids or four acids.
OBJECTIVESTo improve the four acids dissolution system for the determination of 28 elements including rare earth elements and rare metal elements.
METHODSThe method of HCl-HNO₃-HF-HClO₄-H₂SO₄ was developed by addition of H₂SO₄ in the dissolution system of HCl-HNO₃-HF-HClO₄. A new analysis method has been developed for the certified reference material of stream sediment, soil and rock, and 28 elements including rare earth elements in samples were determined simultaneously by ICP-MS with 10ng/mL ¹⁰³Rh and ¹⁸⁵Re as the internal standard by on-line injections.
RESULTSThe accuracy of volatile elements such as vanadium, chromium, cadmium, gallium and tin was improved by 1.4%-14.6%, and that of rare earth elements such as lanthanum and cerium was improved by 0.2%-8.9%. The certified reference materials of stream sediment (GBW07301a), soil (GBW07408) and rock (GBW07107) were analyzed to test the method. The determined values were in good agreement with the certified values. The standard deviations (RSD) of the method were 1.14%-9.84% and accuracy (△lgC) was not higher than 0.1.
CONCLUSIONSThis method is rapid, simple, and accurate and can meet the requirements for determining the content of rare earth, cobalt, hafnium, indium, manganese, niobium, tantalum and other metal elements in large quantities of geological samples.
- geological samples,
- rare earth elements,
- metal elements,
- five acid dissolution system,
- inductively coupled plasma-mass spectrometry

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