干旱区生态环境知识资源中心(Arid): The Origin of Major Ions of Groundwater in a Loess Aquifer

Arid

DOI	10.3390/w11122464
	The Origin of Major Ions of Groundwater in a Loess Aquifer
	Huang, Tianming 1,2; Ma, Baoqiang 3
通讯作者	Huang, Tianming
来源期刊	WATER
EISSN	2073-4441
出版年	2019
卷号	11 期号:12
英文摘要	When groundwater represents most of the world's reserves of unfrozen freshwaters, water quality is commonly a limiting factor in quantifying usable fresh groundwater storage, especially in arid and semi-arid areas. Tracing the origin of major ions is important to the understanding of hydrochemical evolution and water-rock interaction. Strontium (Sr) and calcium (Ca) are geochemically similar in terms of ionic radius and ionic charge and can substitute for each other in mineral lattices such as in carbonates and silicates. This allows the use of Sr as a proxy for Ca during water-rock interaction. Geochemical mass balance and carbon and strontium isotope techniques were employed to study the origin of each major ion (such as Na, Ca, Mg, Cl, and SO4) in a loess aquifer (there is 10% to 20% of carbonate in the loess). Geochemical mass balance between atmospheric deposition and groundwater shows that the Cl (average concentration of 5.5 mg/L) and SO4 (average concentration of 6.8 mg/L) in groundwater originated from atmospheric deposition. The dissolution of loess using acetic acid was used to analyze the Sr-87/Sr-86 ratio of carbonate (mainly deposited in continental environments). Groundwater Sr-87/Sr-86 ratios (0.710677 to 0.712319) are consistent with Sr-87/Sr-86 ratios in carbonate (0.710329 to 0.711085) but are significantly lower than the whole-rock (0.715136 to 0.717155) and residue (0.719091 to 0.720438), suggesting that Ca and Mg mainly originated from the dissolution of carbonate in the loess aquifer. However, Na originated from the dissolution of albite, suggesting saturation controls the ability of dissolution. There are cation exchanges between Ca + Mg and Na, resulting in Na concentration increases and Ca + Mg concentration decreases in groundwater. This study is important to the understand of the origin of the major ions in groundwater and the geochemical processes in silicate-carbonate aquifers.
英文关键词	groundwater strontium isotopes geochemical methods acetic acid Sr-87 Sr-86
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000507378600037
WOS关键词	CARBONATE ; RECHARGE ; ISOTOPES ; DISSOLUTION ; TRACER ; CHINA ; RAIN ; ND
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
EI主题词	2019-12-01
来源机构	中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311183
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China; 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China; 3.China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Huang, Tianming,Ma, Baoqiang. The Origin of Major Ions of Groundwater in a Loess Aquifer[J]. 中国科学院地质与地球物理研究所,2019,11(12).
APA	Huang, Tianming,&Ma, Baoqiang.(2019).The Origin of Major Ions of Groundwater in a Loess Aquifer.WATER,11(12).
MLA	Huang, Tianming,et al."The Origin of Major Ions of Groundwater in a Loess Aquifer".WATER 11.12(2019).