干旱区生态环境知识资源中心(Arid): 原生高砷地下水的类型、化学特征及成因

Arid

	原生高砷地下水的类型、化学特征及成因
其他题名	Types, chemical characteristics and genesis of geogenic high-arsenic groundwater in the world
	郭华明; 倪萍; 贾永锋; 郭琦; 姜玉肖
来源期刊	地学前缘
ISSN	1005-2321
出版年	2014
卷号	21 期号:4 页码:1-12
中文摘要	由于分布广、危害大,原生高砷地下水严重威胁全球内数亿居民的身体健康。研究原生高砷地下水的分布、化学特征及成因有助于进一步理解地下水中砷的迁移转化规律,并确保高砷区地下水的可持续利用。在查阅大量文献资料的基础上,结合近10年的高砷地下水研究经验,把原生高砷地下水分为还原性-中性高砷地下水(Ⅰ-1型)和还原性-弱碱性高砷地下水(Ⅰ-2型)、氧化性-弱碱性高砷地下水(Ⅱ型)和氧化性-弱酸性高砷地下水(Ⅲ型)。Ⅰ-1型高砷地下水主要分布于河流三角洲地区,Ⅰ-2型分布于干旱-半干旱封闭内陆盆地,Ⅱ型主要分布于干旱-半干旱平原-盆地,Ⅲ型主要分布于富含黄铁矿或硫化物矿物的基岩地区。Ⅰ-1型高砷地下水处于还原环境,pH呈中性,Fe/Mn氧化物矿物的还原性溶解是造成As富集的主要原因。Ⅰ-2型高砷地下水处于还原环境,pH呈弱碱性,除了Fe/Mn氧化物矿物的还原性溶解外,As的解吸附是含水层中砷释放的重要原因。Ⅱ型高砷地下水处于氧化-弱氧化环境,pH呈弱碱性,As的解吸附是含水层中砷释放的主要原因。Ⅲ型高砷地下水处于氧化环境,pH呈弱酸性,黄铁矿及其他硫化物矿物的氧化溶解导致了含水层中砷的释放。对于Ⅰ-2型高砷地下水,需要深入研究Fe/Mn氧化物矿物的还原性溶解以及As的解吸附对地下水砷富集的相对贡献量。
英文摘要	Because of its wide distribution and high toxicity, the geogenic high-arsenic groundwater has posed negative impacts on thousands of million residents. Investigation on distribution, chemical characteristics and genesis of high-arsenic groundwater would help in better understanding arsenic transfer and transportation in groundwater systems and ensuring sustainable usage of groundwater resources in As-affected areas. On the basis of recently-published literatures and ten-year experiences on high-As groundwater study, we divide the geogenic high-As groundwater into four types: reducing-neutral pH high As groundwater (Type Ⅰ-1), reducing-weak alkaline high As groundwater (Type Ⅰ-2), oxic-weak alkaline high As groundwater (Type Ⅱ), and oxic-weak acid high As groundwater (Type Ⅲ). Type Ⅰ-1 is mainly distributed in river delta areas, while Type Ⅰ-2 in arid-semiarid closed inland basins. Type Ⅱ has been mainly found in arid-semiarid plain-basin areas, and Type Ⅲ in bedrock areas containing substantial pyrite and sulfide minerals. Type Ⅰ-1 groundwater occurs in reducing conditions, with neutral pH. The major mechanism for As mobilization is the reductive dissolution of Fe/Mn oxides. Type Ⅰ-2 groundwater has been observed in reducing conditions with weak alkaline pH, where both the reductive dissolution of Fe/Mn oxides and desorption of As lead to As release from sediments. Type Ⅱ groundwater is present in oxic-weak oxic conditions with weak alkaline pH. The desorption of arsenic under high pH conditions has been believed to cause As enrichment in groundwaters. In Type Ⅲ groundwater with weak acid pH, oxic conditions result in oxidation of pyrite and other sulfide minerals, subsequently releasing As into groundwater. Concerning Type Ⅰ-2 groundwater, It is important to deeply study the relative contribution of the reductive dissolution of Fe/Mn oxides and of the desorption of As to the As enrichment in groundwaters.
中文关键词	砷形态 ; 水文地球化学 ; 含水层 ; 水-岩相互作用 ; 富砷机理
英文关键词	arsenic species hydrogeochemistry aquifer water-rock interaction enrichment mechanism
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5152386
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230986
作者单位	中国地质大学(北京), 地下水循环与环境演化教育部重点实验室, 北京 100083, 中国
推荐引用方式 GB/T 7714	郭华明,倪萍,贾永锋,等. 原生高砷地下水的类型、化学特征及成因[J],2014,21(4):1-12.
APA	郭华明,倪萍,贾永锋,郭琦,&姜玉肖.(2014).原生高砷地下水的类型、化学特征及成因.地学前缘,21(4),1-12.
MLA	郭华明,et al."原生高砷地下水的类型、化学特征及成因".地学前缘 21.4(2014):1-12.