长江口水环境中纳米颗粒物初探  

Study on Nanoparticles in Yangtze Estuary

作　　者：付佳露[1] 杨毅[1] 彭欢[1] 周立旻[1] 侯立军[2] 刘敏[1] 

机构地区：[1]华东师范大学地理系,教育部地理信息科学重点实验室,上海200062 [2]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《环境科学》2011年第7期1924-1931,共8页Environmental Science

基　　金：国家自然科学青年基金项目(40901256);中央高校基本科研业务费专项资金项目;上海市教委“晨光计划”项目(09CG19)

摘　　要：利用抽滤及切向超滤(cross-flow ultrafiltration,CFUF)技术对长江口水环境中的纳米级颗粒物(NP)进行了有效地分离,对其理化性质进行表征,进而初步探讨了水环境因子对NP理化特性的影响机制.结果表明,长江口水环境中NP粒径变化范围为69.5～263.5 nm,平均值为157.3 nm;Zeta-电位为-40.1～196.0 mV;NOC的浓度在0.3～1.5 mg/L之间,平均为0.7mg/L,NOC在DOC中的质量分数为5.1%～30.5%,平均为16.7%;金属元素与NP结合能力的大小依次为锌>铜>总铬>钴>镍>锰>铁>锂>铝>硼>钾>钡>锶>镁>钙>钠.显示了陆源物质输入可能为长江口水体中NOC的主要来源;NP与痕量金属结合的能力大于常规金属元素.相关分析表明NP粒径与盐度、DOC、NOC、SPM及Zeta-电位均无显著相关性,相对于NOC和UOC,DOC及盐度对NP形态痕量金属含量有较大的影响.Filtration and cross-flow ultrafiltration（CFUF） was applied for the effective separation of NPs in the Yangtze Estuary.The physiochemical properties of NP were characterized,and their relationships with environmental factors were further studied in the present study.The results show that NP size in Yangtze Estuary ranged from 69.5 to 263.5 nm with the average value of 157.3 nm and Zeta-potential values ranged from-40.1 mV to 196.0 mV.NOC concentrations ranged from 0.3 mg/L to 1.5 mg/L and the average value was 0.7 mg/L.NOC account for 5.1% to 30.5% of DOC,with an average of 16.7%.The binding capacity of metals with NP in the Yangtze River Estuary was in the order of Zn〉Cu total Cr〉Co〉Ni〉Mn〉Fe〉Li〉Al〉B〉K〉Ba〉Sr〉Mg〉Ca〉Na,which reveals that terrigenous input may be the main source of NOC in the Yangtze River.The binding capacity of NP with trace metal is generally higher than the conventional metallic element.There was no significant correlation between NP size and salinity,DOC,NOC,SPM and Zeta-potential,respectively.Compared to NOC and UOC,better correlation was investigated between DOC,salinity and NP bound trace metals.

关 键 词：长江口 NP 切向超滤 痕量金属 环境因子 

分 类 号：X522[环境科学与工程—环境工程]