2022 Vol. 49, No. 2
Article Contents

WANG Renqi, ZHANG Zhimin, CHAO Xu, FENG Haiyan, YANG Zhongfang. 2022. A study of the Selenium speciation in paddy soil and status of selenium-enriched rice in western part of Ankang City, Shaanxi Province[J]. Geology in China, 49(2): 398-408. doi: 10.12029/gc20220204
Citation: WANG Renqi, ZHANG Zhimin, CHAO Xu, FENG Haiyan, YANG Zhongfang. 2022. A study of the Selenium speciation in paddy soil and status of selenium-enriched rice in western part of Ankang City, Shaanxi Province[J]. Geology in China, 49(2): 398-408. doi: 10.12029/gc20220204

A study of the Selenium speciation in paddy soil and status of selenium-enriched rice in western part of Ankang City, Shaanxi Province

    Fund Project: Supported by public welfare geological survey project of Shaanxi Provincial Geological Survey Institute (No.201909)
More Information
  • Author Bio: WANG Renqi, male, born in 1999, master candidate, majors in geochemistry, mainly engaged in environmental geochemistry research; E-mail: renqiwang1999@163.com
  • Corresponding author: FENG Haiyan, female, born in 1974, associate professor, agricultural soil chemistry, mainly engaged in environmental and ecological geochemistry; E-mail: haiyan@cugb.edu.cn 
  • This paper is the result of agricultural geological survey engineering.

    Objective

    The uptake and accumulation of selenium in rice grain is determined by the bioavailability of selenium in paddy soils, which can be directly affected by its speciation pattern.In this study, the selenium speciation in soils from the west of Ankang City, Shaanxi province was analyzed to investigate the correlation of selenium content in rice grain with the speciation pattern of selenium in soils.

    Methods

    The distribution characteristics of seleniumspeciation in soils was examined by analyzing the concentrations of selenium in soils and rice grain.

    Results

    The concentrations of speciation fractions varied significantly. Detailedly, the humic acid boundfraction of selenium accounted for more than 90% of the total content, whereas the water-solublefraction, ion-exchangeable fraction, manganese oxides fraction and carbonate bounded fraction occupied less than 5%. This study observed a tight relationship between the rice uptake of selenium and its concentration ofwater-soluble fraction andion-exchangeable fraction in paddy soils, which was consistent with the results found in previous studiesand will provide fundamental basis for the development of selenium-rich rice. The average concentration of selenium in rice grainwas 0.20 mg/kg, which met the national standard.

    Conclusions

    The enrichment degree of selenium in paddy soils from the study area was high. This caused the relative accumulation of selenium in rice grain, which met the national standard. This study reveals broad prospects in the development of selenium-rich rice.

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