摘要
于2016年12月到次年1月采集了珠海市及周边的26个地下水样并测定了常规物化指标,以及样品中的Cu、As、Cd、Pb、Zn等重金属和类金属浓度。结果表明,随着取样深度的增加,地下水的p H、NH+4和总溶剂固体(TDS)呈逐渐上升趋势,深层地下水的水化学类型趋向于与海水相似的Na-Cl型,并且基岩出露区地下水的重金属和类金属浓度较低,而平原区地下水的重金属和类金属存在超标现象,且具有p H较低、TDS高于基岩出露区地下水的特点。研究区地下水中重金属Cd的污染程度最高,污染程度为Cd>Pb>As>Cu。从来源上看,地下水中污染重金属和类金属主要是由于沉积有机质在沉积古海水存在的环境中发生矿化引发的还原释放、岩石风化及人为污染等。
In order to investigate the status and sources of heavy metal/metalloid pollution in groundwater system of Zhuhai City,26 groundwater samples from Zhuhai City and its surrounding areas were collected and analyzed during December2016 to January 2017. Besides heavy/metalloid concentrations,such as Cu,As,Cd,Pb and Zn,physical and chemical parameters of all the samples were measured. The results show that pH,EC and TDS in groundwater increase with the depth. The water type of deep groundwater is Na-Cl,similar to the seawater. Groundwater in the plain area has low pH value and heavy metal/metalloid higher than the drinking water standard. In contrast,groundwater in bedrock exposed area has TDS and heavy metal/metalloid lower than that in plain area. All samples show a contaminating order of Cd>Pb>As>Cu,with the highest pollution degree of Cd. Our study demonstrated that heavy metal/metalloid is originated from the reducing processes induced by the reaction between sedimentary organic matter and paleo-seawater,the weathering of rocks and the anthropogenic influence.
作者
程焰
王亚
周永章
顾涛
CHENG Yan;WANG Ya;ZHOU Yong-zhang;GU Tao(School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275 ,China;Guangdong Provincial Key Laboratory of Geological Processes & Mineral Resources Survey,Guangzhou 510275 ,China;Wuhan Center of Geological Survey,China Geological Survey,Wuhan 430205 ,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2019年第3期595-603,共9页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目(41602253)
广东省自然科学基金资助项目(2017A030313222,2016A030313308)
关键词
珠海市
地下水
重金属和类金属
污染来源
Zhuhai city
groundwater
heavy metal/metalloid
source of pollution analysis
