气候变化领域集成服务门户(CCPortal): The geochemical stability of typical arsenic-bearing sinter in the Tibetan plateau: Implications from quantitative mineralogy

CCPortal

DOI	10.1016/j.scitotenv.2023.166862
	The geochemical stability of typical arsenic-bearing sinter in the Tibetan plateau: Implications from quantitative mineralogy
	Wen, Qiqian; Yang, Linsheng; Dai, Weijie; Yu, Jiangping; Wei, Binggan; Yin, Shuhui
发表日期	2023
ISSN	0048-9697
EISSN	1879-1026
卷号	904
英文摘要	High-arsenic (As) sinter deposited from geothermal water is a potentially overlooked hazardous matrix and there remain substantial gaps in our comprehension of the stability of As sequestered within it. In this study, qualitative and quantitative analysis of the mineralogy of As-bearing sinter was conducted by Mineral Liberation Analyzer (MLA) in geothermal areas of the Tibetan Plateau to reveal the geochemical stability of As. Our results indicated that the contents of As in sinter were 3 orders of magnitude higher than the local soil. The dominant host minerals of As were calcite (40.9 %), thenardite (22.5 %), calcium silicate (13.0 %), and halite (8.1 %). Additionally, it was found that a relatively higher As bioavailability was extracted by ethylene diamine tetraacetic acid (EDTA), with a leaching rate of 41.2 %. Notably, the X-ray diffraction (XRD) showed that the thenardite and halite were decomposed after the leaching. The combination of mineralogy and geochemistry data suggested that calcite and calcium silicate were a crucial mechanism for As retention in sinter, while the dissolution of saline minerals (e.g., thenardite, halite, and calcium chloride) served as the primary sources for As release. This finding unveils the potential risks and mechanisms associated with high-As sinter, providing scientific guidance for risk management of sinter.
关键词	Quantitative analysis of As Leaching test Sinter in geothermal areas Mineral composition
英文关键词	CALCITE; PH; ELEMENTS; CONTAMINATION; SPECIATION; BORON; SOIL
WOS研究方向	Environmental Sciences
WOS记录号	WOS:001080422100001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283788
作者单位	Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS
推荐引用方式 GB/T 7714	Wen, Qiqian,Yang, Linsheng,Dai, Weijie,et al. The geochemical stability of typical arsenic-bearing sinter in the Tibetan plateau: Implications from quantitative mineralogy[J],2023,904.
APA	Wen, Qiqian,Yang, Linsheng,Dai, Weijie,Yu, Jiangping,Wei, Binggan,&Yin, Shuhui.(2023).The geochemical stability of typical arsenic-bearing sinter in the Tibetan plateau: Implications from quantitative mineralogy.SCIENCE OF THE TOTAL ENVIRONMENT,904.
MLA	Wen, Qiqian,et al."The geochemical stability of typical arsenic-bearing sinter in the Tibetan plateau: Implications from quantitative mineralogy".SCIENCE OF THE TOTAL ENVIRONMENT 904(2023).