环境因素对溶解性有机质(DOM)与砷/锑相互作用的影响  

THE EFFECT OF ENVIRONMENTAL FACTORS ON THE INTERACTION BETWEEN As / Sb AND DOM

作　　者：王颖[1] 余艳鸽 张曼曼[1] 沈潺潺[1] 张笛[1] 

机构地区：[1]北京师范大学环境学院水沙科学教育部重点实验室,北京100875

出　　处：《环境工程》2015年第12期29-34,38,共7页Environmental Engineering

基　　金：国家自然科学基金(21177013);国家重点基础研究计划(973)项目(2010CB429003);国家国际科技合作专项(2013DFR90290)

摘　　要：利用荧光发射光谱和三维荧光光谱研究了环境因素(pH值、盐度、共存离子和光照)对长江口不同区域(南支岸边、北支岸边、河道和海域)沉积物提取DOM样品与砷/锑(As/Sb)之间相互作用的影响。结果表明,DOM的荧光强度随水体pH值的升高而增大,其主要归因于类蛋白峰B、D峰的增强。Sb^(3+)对类蛋白峰B、D的淬灭最为明显,但不同pH值条件对DOM与As/Sb相互作用的影响不大。盐度的增加可促进As/Sb与DOM的结合。Ca^(2+)的加入可减弱As/Sb对DOM类蛋白荧光的淬灭作用,因此Ca^(2+)抑制DOM与As/Sb的相互结合,并且随Ca^(2+)浓度的增加抑制作用增强。Mg^(2+)的影响很小。光照可促进DOM自身发生光降解,其对As5+淬灭类蛋白D峰有明显的促进作用。The effects of environmental factors（ pH,salinity,ions and sunlight） on the interaction between trivalent or pentavalent As / Sb and dissolved organic matter（ DOM） in sediments from the Yangtze Estuary（ the north and south nearshore,the river channel and the adjacent coastal area） were studied using the fluorescence emission spectrum and excitation emission matrix spectra. The results showed that DOM fluorescence intensity increased with the pH increasing,which may be due to the increase of the protein-like components（ protein-like peak B and D）. The protein-like eak B and D were quenched obviously by Sb^（3＋）. The little influence of p H on the interaction between As / Sb and DOM was observed. A decrease in fluorescence intensity was found after the addition of NaCl in the DOM-As / Sb solution. The addition of Ca^（2＋）decreased the quench effect of As / Sb on the protein-like components. This inhibition effect increased with the increase of Ca^（2＋）concentration. No influence of Mg^（2＋）was observed. Sunlight could lead to the degradation of DOM itself. The fluorescence intensity of protein-like peak D significantly weakened with the addition of As^（5＋）in the sunlight.

关 键 词：长江口 溶解性有机质 砷/锑 环境因素 

分 类 号：X131.2[环境科学与工程—环境科学]