Interference Sources and Elimination Methods for the Determination of Selenium in Soil and Water Sediment by Atomic Fluorescence Spectrometry

Zong-sheng ZHAO; Xiao-xue ZHAO; Xiao-xu JIANG; Lin-lin ZHAO; Lin-lin ZHANG

doi:10.15898/j.cnki.11-2131/td.201809190106

2019 Vol. 38, No. 3

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Article navigation > Rock and Mineral Analysis > 2019 > 38(3): 333-340

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Zong-sheng ZHAO, Xiao-xue ZHAO, Xiao-xu JIANG, Lin-lin ZHAO, Lin-lin ZHANG. Interference Sources and Elimination Methods for the Determination of Selenium in Soil and Water Sediment by Atomic Fluorescence Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(3): 333-340. doi: 10.15898/j.cnki.11-2131/td.201809190106

Citation:

Zong-sheng ZHAO, Xiao-xue ZHAO, Xiao-xu JIANG, Lin-lin ZHAO, Lin-lin ZHANG. Interference Sources and Elimination Methods for the Determination of Selenium in Soil and Water Sediment by Atomic Fluorescence Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(3): 333-340. doi: 10.15898/j.cnki.11-2131/td.201809190106

Interference Sources and Elimination Methods for the Determination of Selenium in Soil and Water Sediment by Atomic Fluorescence Spectrometry

1.
Henan Province Key Laboratory of Heavy-metal Pollution Monitoring and Remediation, Jiyuan 459000, China
2.
China National Environmental Monitoring Center, Beijing 100012, China

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Corresponding author: Lin-lin ZHANG, zhangll@cnemc.cn

Received Date: 19 September 2018

Revised Date: 14 March 2019

Accepted Date: 09 April 2019

Abstract

Abstract

BACKGROUNDAtomic Fluorescence Spectrometry (AFS) has advantages of high sensitivity, simple structure and easy operation, but the digestion process of the standard analysis method for determination of Se in soil is cumbersome and readily produces interference. OBJECTIVESTo evaluate the applicability of Se determination in soil and sediment by water bath digestion/AFS, and uncover the main interference and elimination methods. METHODSBased on the standard method of GB/T 22105-2008, boiling water bath of aqua regina was used to digest Se in soil and sediment. Four treatments, including Fe³⁺, concentrated hydrochloric acid, Fe³⁺with concentrated hydrochloric acid, and water bath solution, were used to eliminate the interference of Cu²⁺ and Pb⁴⁺. RESULTSThe detection limit of Se by this method was 0.008mg/kg, the relative standard deviation of the test reference materials was 0.5%-11%, and the relative error was -16.3%-9.5%, better than the detection limit (0.01mg/kg), precision (0.79%-23.1%) and accuracy of the industry standard HJ 680-2013. CONCLUSIONSAccording to the experiment, it is proposed to add concentrated hydrochloric acid to the water bath digestion solution without adding thiourea-ascorbic acid. By increasing the acidity and Cl^- concentration of the solution and keeping the concentration of hydrochloric acid in the sample higher than 23%, the reduction of Cu²⁺ to Cu⁰ and Pb⁴⁺ to form PbH₄ can be inhibited. The negative interference of Cu and the positive interference of Pb are effectively reduced, and the precision and accuracy of Se measured by AFS are improved.
- soil /
- sediment /
- water bath digestion /
- selenium /
- Atomic Fluorescence Spectrometry /
- interference elimination

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References

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