Determination of Thorium in Geochemical Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry

Jun WANG; Di WANG; Chang-sheng DENG; Jian-mei ZHANG; Dong YANG; Bin-tang WANG; Su-xia ZHU

Rock and Mineral Analysis > 2014 > 33(4): 501-505.

Jun WANG, Di WANG, Chang-sheng DENG, Jian-mei ZHANG, Dong YANG, Bin-tang WANG, Su-xia ZHU. Determination of Thorium in Geochemical Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry[J]. Rock and Mineral Analysis, 2014, 33(4): 501-505.

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Determination of Thorium in Geochemical Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry

Xinjiang Physical and Chemical Analysis Testing Center, China National Nuclear Corporation, Urumqi 830011, China

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Received Date: September 09, 2013
Revised Date: February 10, 2014
Accepted Date: May 15, 2014
Published Date: June 30, 2014

Abstract

ABSTRACT

Thorium in geological samples, digested by mixed acid system of HNO₃-HCl-HClO₄-HF, is measured by using Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES). In the practical analysis, the stability of the results is poor when the content of thorium, moreover, the content of thorium cannot be detected with high matrix effect. In this work, a new method is described for the determination of thorium using ICP-AES. The pretreatment process is optimized by digestion with Na₂O₂, filtration separated with 10 g/L NaOH and resolved with 40% hot HCl acid. The best analytical line of thorium is 401.913 nm by studying the working conditions of ICP-AES. The method detection limit is 0.21 μg/g, the relative standard deviation (n=7) are from 7.7% to 15.9%, the relative error (n=6) are from 7.0% to 10.0%, and the standard addition recovery are from 92.0% to 104.0%. Furthermore, this method can be used to determine accurately the content of thorium, which is higher than 0.21 μg/g based on verification of certified reference materials. Compared with conventional methods, this method is simple, fast, and highly accurate and has a lower detection limit. It is suitable for practical determination of a large amount of samples.
- geochemical sample,
- thorium,
- alkali fusion,
- Inductively Coupled Plasma-Atomic Emission Spectrometry

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