鄱阳湖流域砷的理化特性及来源分析  

Sources and physicochemical properties of arsenic in Poyang Lake

作　　者：李艳红[1,2] 王茂林[1] 周晓岚[1] 葛刚[1] 胡春华[1] 

机构地区：[1]南昌大学鄱阳湖环境与资源利用教育部重点实验室,江西南昌330029 [2]江西省水利科学研究院,江西南昌330047

出　　处：《南昌大学学报（理科版）》2015年第3期280-285,295,共7页Journal of Nanchang University(Natural Science)

基　　金：国家水体污染控制与治理科技重大专项(2008zx07526-008-03);国家自然科学基金(40672159);中国经济改革实施技术援助项目(支援期TCC5jxspyhzxh09-03);鄱阳湖环境与资源利用重点实验室支持项目(13005879,13005870)

摘　　要：通过对鄱阳湖湖区以及江西省五大河流中溶解态砷的跟踪调查,研究不同区域砷含量的空间分布、污染特征及与水体理化性质之间的关系,探究影响砷空间分布的影响因素,分析鄱阳湖区不同断面采砂前后砷的动态变化。结果表明,鄱阳湖流域主湖区以及赣江、饶河、抚河、修河水体砷浓度在检测限水平以下,而在信江中游的鹰潭市和长江流经的九江砷含量出现局部高浓度,其平均值分别为12.53、1.33μg·L-1,污染最为严重,主要是受到了鹰潭冶炼工业和九江火山岩层下地热水的影响;水体理化性质与溶解性砷含量之间存在不同程度的相关性,水体砷含量与pH、TP、TN具有正相关关系,其相关系数分别是0.48、0.44、0.34,水体中砷含量与Eh、S2-、砂粒的相关系数分别是-0.32、-0.31、-3.13,表现出负相关关系,TC与砷的相关关系不明显;水体中Eh-pH通过控制水溶液中砷的形态影响可溶性砷含量,高浓度的溶解性砷存在于pH较高、还原性的地下水体中,但在低pH并且含有高浓度自由S2-的还原性水体中溶解性砷含量很低;水体中砷的存在形态与TP、TN具有相似性,深度富营养化加速浮游藻类的繁殖从而可降低溶解性As含量,同时禁砂之后的时间段内水体中砷也相应的下降。Dissolved arsenic of Poyang Lake and five major rivers in Jiangxi Province were characterized systemically.We discovered that it contained the spatial distribution of arsenic in different areas We also investigated the relationship between physical and chemical properties,and analyzed the different sections of sand around the Lake District dynamic changes of arsenic.The results showed that the arsenic concentrations of main lake,Poyang Lake,Basin Gan River and Fuhe were all below the level of water test line.The heavy concentrations mainly distributes in the middle rivers of Xinjiang,especially Yingtan City and Jiujiang city of Yangtze River.The average concentrations were 12.53ug·L^-1 and 1.33ug·L^-1,mainly due to the impact of Yingtan Smelting industries and Jiujiang Geothermal water influenced by hot volcanic rocks.Arsenic had different degrees of correlations between the physical and chemical nature of the water solubility.Arsenic in water with pH,TP,TN had a positive correlation,with the correlation coefficientsbeing 0.48,0.44,0.34,Eh,S^2-.Sand correlation coefficients were-0.32,-0.31,-3.13,showing a negative correlation with arsenic.TC relationship was not obvious.Eh-pH influenced the morphological changes of water soluble arsenic,presenting higher concentrations with higher pH.However,at low pH and abundant concentrations freedom S2-,solubility of arsenic was lower.Depth eutrophication and sand Prohibit could reduce the solubility of As content.

关 键 词：鄱阳湖 砷污染 重金属 富营养化 影响因子 

分 类 号：X501[环境科学与工程—环境工程]