Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 548-558.doi: 10.13278/j.cnki.jjuese.20170224

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Geochemical Anomalies of Arsenic and Its Speciation in Daggyai Geothermal Springs, Tibet

Yan Ketao, Guo Qinghai, Liu Mingliang   

  1. State Key Laboratory of Biogeology and Environmental Geology/School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
  • Received:2017-09-05 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China(41572335,41772370)

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Abstract: Daggyai geothermal system in Tibet includes the biggest geyser in mainland China. Arsenic, as one of the most harmful substances, commonly exists in geothermal water, and the highest arsenic concentration detected in Daggyai geothermal springs reaches 9.75 mg/L, unneglectable potential arsenic pollution in shallow groundwater and rivers should be noticed. Thioarsenic usually exists as the dominant species of arsenic in sulfide-rich thermal springs;however there are few related studies in China. We focused on Daggyai geothermal system, and analyzed the chemical components of the geothermal spring samples. Thioarsenic species in each sample were calculated by using the hydro-geothermal simulation software PHREEQC. The results are as follows:Arsenic in Daggyai geothermal water consists of arsenate, arsenite, and thioarsenic, among which the arsenate and arsenite are the main species. There are interchanges between arsenate and arsenite when pH changes. The descending order of thioarsenic species in terms of their average ratio is monothioarsenate, trithioarsenate, ditthioarsenate, monothioarsenite and tetrathioarsenate. The proportion of thioarsenic to total arsenic concentration is mainly controlled by sulfide concentration, pH and Eh in geothermal water. High concentration of sulfide can promote the process of arsenic changing into thioarsenic, and strong reducing environment is required for the existence of thioarsenic. Moreover, the percentage of thioarsenic seems to have a positive correlation with pH value.

Key words: geothermal spring, thioarsenic, Daggyai geothermal system, geochemistry

CLC Number: 

  • X142
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