Determination of Trace Selenium in High-Carbon and High-Sulfur Geological Samples by Thiol Cotton Fiber Separation-Atomic Fluorescence Spectrometry

MA Wan-ping; WEN Han-jie; YE Qin; ZHAO Yue; YANG Ji-hua

doi:10.15898/j.cnki.11-2131/td.202101220013

Rock and Mineral Analysis > 2021 > 40(4): 550-560. > DOI: 10.15898/j.cnki.11-2131/td.202101220013

MA Wan-ping, WEN Han-jie, YE Qin, ZHAO Yue, YANG Ji-hua. Determination of Trace Selenium in High-Carbon and High-Sulfur Geological Samples by Thiol Cotton Fiber Separation-Atomic Fluorescence Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(4): 550-560. DOI: 10.15898/j.cnki.11-2131/td.202101220013

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Determination of Trace Selenium in High-Carbon and High-Sulfur Geological Samples by Thiol Cotton Fiber Separation-Atomic Fluorescence Spectrometry

1.
School of Earth Sciences, East China University of Technology, Nanchang 330013, China
2.
College of Earth Sciences and Resources, Chang'an University, Xi'an 710054, China
3.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

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Received Date: January 21, 2021
Revised Date: April 20, 2021
Accepted Date: May 16, 2021
Published Date: July 27, 2021

Abstract

HIGHLIGHTS
(1) Microwave digestion was used to reduce the loss of selenium (a volatile element) and the experimental time.

(2) Thiol cotton fiber (TCF) was used to separate and purify selenium, reducing the interference of the complex matrix.

(3) The improved method is suitable for geological samples containing organic matter or sulfides.

ABSTRACT

BACKGROUNDHydride generation-atomic fluorescence spectroscopy (HG-AFS) is highly sensitive for the determination of trace selenium in geological samples. However, the complex matrix increases the analysis difficulty, especially owing to interference caused by organic carbon, complicated complexes, and coexisting ions in samples rich in organic matter and sulfides. Therefore, sample pretreatment is important. The use of conventional thiol cotton fiber (TCF) to enrich and separate selenium often leads to unstable recovery and premature saturation of the TCF when dealing with samples rich in organic matter and sulfides.
OBJECTIVESTo establish a method suitable for the determination of trace selenium in geological samples rich in organic matter and sulfides.
METHODSFor samples rich in organic matter, a double TCF column (m_TCF=0.15g) was used to carry out adsorption twice. The recovery for high-sulfur geological samples could be increased either by increasing the amount of TCF (m_TCF ≤ 0.2g) or reducing the sample amount.
RESULTSThe measurement results for the reference materials and actual samples showed that the optimized method satisfied the analysis requirements as selenium recoveries of >95.1% and >95.5% were achieved for the organic-rich and sulfide samples, respectively. Microwave digestion can effectively avoid the loss of selenium during digestion; the measured selenium content was consistent with that reported in the literature.
CONCLUSIONSThe improved method is suitable for geological samples rich in organic matter and sulfides, which can be used to determine trace selenium (ng/g to μg/g levels) in geological samples.

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References (39)

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Determination of Trace Selenium in High-Carbon and High-Sulfur Geological Samples by Thiol Cotton Fiber Separation-Atomic Fluorescence Spectrometry

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