A Comparative Study of Four Extractants on the Extraction of Available Selenium in Vegetable and Orchard Soils

Wei XIE; Yao-dong YANG; Gui-qin JIAN; Guo-cheng LI; Xin-hua ZHAO; Jia-yu HOU

doi:10.15898/j.cnki.11-2131/td.201905150063

2020 Vol. 39, No. 3

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Article navigation > Rock and Mineral Analysis > 2020 > 39(3): 434-441

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Wei XIE, Yao-dong YANG, Gui-qin JIAN, Guo-cheng LI, Xin-hua ZHAO, Jia-yu HOU. A Comparative Study of Four Extractants on the Extraction of Available Selenium in Vegetable and Orchard Soils[J]. Rock and Mineral Analysis, 2020, 39(3): 434-441. doi: 10.15898/j.cnki.11-2131/td.201905150063

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Wei XIE, Yao-dong YANG, Gui-qin JIAN, Guo-cheng LI, Xin-hua ZHAO, Jia-yu HOU. A Comparative Study of Four Extractants on the Extraction of Available Selenium in Vegetable and Orchard Soils[J]. Rock and Mineral Analysis, 2020, 39(3): 434-441. doi: 10.15898/j.cnki.11-2131/td.201905150063

A Comparative Study of Four Extractants on the Extraction of Available Selenium in Vegetable and Orchard Soils

1.
Tianjin Geological and Mineral Testing Center, Tianjin 300191, China
2.
Geological Center of Tianjin Planning and Natural Resources Bureau, Tianjin 300042, China

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Corresponding author: Yao-dong YANG, fivess@139.com

Received Date: 15 May 2019

Revised Date: 30 September 2019

Accepted Date: 16 April 2020

Abstract

Abstract

BACKGROUNDAvailable selenium is an important index to evaluate the supply capacity of selenium from soil to plants. However, there is no national standard method to test available selenium in China. The selection of extractants is very important for the accurate determination of available selenium. OBJECTIVESTo determine the optimum extractant based on the correlation between available selenium and selenium species. METHODSFour extractants, sodium bicarbonate, potassium dihydrogen phosphate, nitric acid and hydrochloric acid, were selected to extract the available selenium from vegetable and orchard soils in Tianjin. Atomic fluorescence spectrometry was used to determine the content of various forms of selenium, and the minimum, 25 percentile, median, 75 percentile, maximum value of the effective selenium and water-soluble+ion-exchange+carbonate-combined selenium were used for comparative analysis and the difference. RESULTSThe average content of available selenium extracted from vegetable soils by sodium bicarbonate and potassium dihydrogen phosphate was 0.039mg/kg, which was higher than that of nitric acid and hydrochloric acid. The contents of available selenium extracted from orchard soils by sodium bicarbonate, potassium dihydrogen phosphate, nitric acid and hydrochloric acid decreased in turn. The minimum, 25 percentile, median, 75 percentile, and maximum values of available selenium extracted by potassium dihydrogen phosphate in the two soils were closer to the content of sum of water-soluble, ion-exchange and carbonate combined selenium. CONCLUSIONSPotassium dihydrogen phosphate with a concentration of 0.1mol/L was the optimum extractant of available Se for vegetable and orchard soils in Tianjin.
- soil /
- selenium /
- available form /
- speciation analysis /
- extractants /
- potassium dihydrogen phosphate /
- atomic fluorescence spectrometry

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References

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