Determination of Valences of As, Cr, Sb and Se in Soil Using HPLC-HG-AFS

XUE Jia

doi:10.15898/j.cnki.11-2131/td.202003090028

Rock and Mineral Analysis > 2021 > 40(2): 250-261. > DOI: 10.15898/j.cnki.11-2131/td.202003090028

XUE Jia. Determination of Valences of As, Cr, Sb and Se in Soil Using HPLC-HG-AFS[J]. Rock and Mineral Analysis, 2021, 40(2): 250-261. DOI: 10.15898/j.cnki.11-2131/td.202003090028

Citation:

XUE Jia. Determination of Valences of As, Cr, Sb and Se in Soil Using HPLC-HG-AFS[J]. Rock and Mineral Analysis, 2021, 40(2): 250-261. DOI: 10.15898/j.cnki.11-2131/td.202003090028

Citation:

XUE Jia. Determination of Valences of As, Cr, Sb and Se in Soil Using HPLC-HG-AFS[J]. Rock and Mineral Analysis, 2021, 40(2): 250-261. DOI: 10.15898/j.cnki.11-2131/td.202003090028

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Determination of Valences of As, Cr, Sb and Se in Soil Using HPLC-HG-AFS

XUE Jia

Fujian Research Center of Geological Analysis and Testing, Fuzhou 350003, China

More Information

Received Date: March 08, 2020
Revised Date: June 10, 2020
Accepted Date: December 17, 2020
Published Date: March 27, 2021

Abstract

HIGHLIGHTS
(1) A set of methods for the determination of water-soluble and exchangeable As(Ⅲ), As(Ⅴ), Cr(Ⅲ), Cr(Ⅵ), Sb(Ⅲ), Sb(Ⅴ), Se(Ⅳ) and Se(Ⅵ) in soil samples was established.

(2) Determination by HPLC-HG-AFS was more efficient than by other non-chromatographic methods.

(3) Experiments showed that the element valence content of the soil leaching solution was low, much lower than the total amount of the element.

ABSTRACT

BACKGROUNDThe environmental effects of heavy metal pollutants in soil are closely related to their inorganic valence. The determination of the valences of As, Cr, Sb and Se elements is of great significance, but due to the easy conversion between the valences, the determination is difficult and the degree of standardization is low. The geological industry standard DD2005-3 recommends the use of ion exchange resin separation, atomic fluorescence spectrometry to determine the valences of As, Sb, and Se, and graphite furnace atomic absorption spectrometry (GFAAS) to determine the valence of Cr. The preparation of these methods is cumbersome, the number of measurements is large, the workload is large, and the existence of other element forms can also cause errors in the results.
OBJECTIVESTo establish a set of methods suitable for determining the valences of water-soluble and exchangeable As, Cr, Sb and Se in soil samples.
METHODSThe valences of As, Sb and Se were separated and determined by HPLC-HG-AFS after 30 min extraction in a water bath of 50℃. The processes were simpler and more accurate than the recommended subtraction processes by AFS. To avoid the masking action of some extracting agent, the method of selective determination of Sb(Ⅲ), Sb(Ⅴ), Se(Ⅳ) and Se(Ⅵ) by AFS was developed, which has the advantage of low instrument cost. As for Cr(Ⅲ) and Cr(Ⅵ), after separation by ion-exchange resin, they were determined by ICP-MS, which has higher sensitivity than the recommended GFAAS.
RESULTSThe detection limits of As(Ⅲ), As(Ⅴ), Cr(Ⅲ), Cr(Ⅵ), Sb(Ⅲ), Sb(Ⅴ), Se(Ⅳ) and Se(Ⅵ) was ≤ 0.02μg/g, with the RSD of 3.8%-10.7% and the recovery of 91.0%-106.0%. These methods were successfully applied to the analysis of geological samples, and all indices met the quality requirements of DD2005-3.
CONCLUSIONSCompared with non-chromatographic methods, newly established methods by HPLC-HG-AFS can determine multiple components simultaneously. At the same time, preliminary studies have shown that the valence content of elements in the soil is not high, and lacks correlation with the total amount of soil.
- As,
- Cr,
- Sb,
- Se,
- valence detection,
- liquid chromatography-atomic fluorescence spectrometry

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References (42)

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