海拉尔河典型傍河型地下水源砷的富集机制与溶解性有机物三维荧光特性解析  

The enrichment mechanisms of arsenic and three-dimensional fluorescence spectroscopy characteristics of dissolved organic matters in typical riverside groundwater sources of the Hailar River

作　　者：樊月婷 昌盛[1] 张茉莉[1] 杨光[1] 王山军[1] 谢琼[1] 赵少延[1] FAN Yueting;CHANG Sheng;ZHANG Moli;YANG Guang;WANG Shanjun;XIE Qiong;ZHAO Shaoyan(State Environmental Protection Key Laboratory of Drinking Water Source Protection,State Key Laboratory of Environmental Criteria and Risk Assessment,National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences,Beijing,100012,China)

机构地区：[1]中国环境科学研究院,国家环境保护饮用水水源地保护重点实验室,环境基准与风险评估国家重点实验室,湖泊水污染治理与生态修复技术国家工程实验室,北京100012

出　　处：《环境化学》2024年第7期2280-2290,共11页Environmental Chemistry

基　　金：生态环境部专项-大气、水、土壤污染防治行动计划实施管理-饮用水环境监管项目资助.

摘　　要：傍河型地下水是我国北方地区较为普遍的一种饮用水水源地类型,其水质水量受临近河道和地下径流补充双重影响.海拉尔河沿线傍河型地下水源中砷浓度较高,备受关注.溶解性有机质(dissolved organic matter,DOM)是影响地下水中砷释放的主要因素,为此,本研究对海拉尔河和沿线地下水水源中砷(As)的含量和DOM进行调查监测,展开三维荧光光谱分析,利用平行因子法确定水体的有机物组分,对探究砷的富集机理具有重要意义.结果表明,满洲里水体中DOM包括含陆源类腐殖质(C1)、类醌化合物(C2)和微生物来源的腐殖质(C3)的3种组分.傍河地下水源的腐殖化程度高于地表河流,且浅水井多为陆源和微生物源混合来源有机物.有机质通过多种方式影响地下水中砷的浓度,主要为C1通过络合方式促进溶解性砷浓度升高,C2则穿梭于易分解的DOM、Fe和As之间,对微生物的氧化还原作用起传递作用.综上,在陆源类有机物和微生物利用内源有机碳的共同作用下,使As在地下水中的浓度逐年升高.Riverside groundwater is a common type of drinking water source in northern China,and its water quality and quantity are affected by both neighboring river courses and groundwater runoff supplement.Arsenic concentration in riverside groundwater along the Hailar River is high,which has attracted much attention.Dissolved organic matter(DOM)is a key factor of arsenic release in groundwater.This study investigated and monitored the arsenic content and DOM of the Hailar River and groundwater sources along the line,carried out three-dimensional fluorescence spectrum analysis,determined the organic matter composition in water body by parallel factor method,which was of great significance to explore the enrichment mechanism of arsenic.The results showed that the DOM in the water of Manzhouli included three components,C1 was terrestrial humic-like;C2 was semiquinone-like;C3 was microbial humic.The degree of humification in groundwater was relatively higher,and most shallow wells were organic matters of mixed source from terrestrial and microbial sources.Organic matters affect the concentration of As in groundwater in a variety of ways.The main reason was that C1 promoted the increase of soluble arsenic concentration through complexation;and C2 shuttled to enhance microbial oxidation and reduction between DOM,Fe and As.In summary,the concentrations of As in groundwater increased year by year due to the simultaneous use of endogenous organic carbon by terrestrial organisms and microorganisms.

关 键 词：满洲里 地下水源 砷 三维荧光光谱 平行因子分析 

分 类 号：X-1[环境科学与工程] O6[理学—化学]