Molecular Weight and Concentration Influenced Dissolved Organic Matter Complexation with Heavy Metals
SHI Taoran
WU Fuyong
YU Tao
XU Feifei
TIAN Kai
MA Xiaona
Abstract：The equilibrium dialysis method and spectroscopy technology were performed to explore the interaction between different concentrations of heavy metal and different molecular weights DOM from Dianchi Lake sediment.Results indicated that TOC concentration was maximal in the DOM fraction with molecular weight lower than 1 000 u after different molecular weights DOM combined with total Cu,TOC concentration was maximal in the DOM fraction with molecular weight of 1 000 to 2 000 u after different molecular weights DOM combined with total Pb.TOC concentration decreased with increased molecular weight,and was not effected by concentration gradient of heavy metal.Total Cu concentration was maximal in the DOM fraction with molecular weight lower than 1 000 u,total Pb concentration was maximal in the DOM with molecular weight between 1 000 and 2 000 u.Total Cu and total Pb concentrations affected by concentration gradient of heavy metal were higher in Caohai individual DOM fractions than in Waihai.This research will provide the theory basis for the research on interaction of DOM and heavy metals in the lake sediments.
Keywords：equilibrium dialysisheavy metaldissolved organic mattermolecular weightconcentration gradient
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1-8 )