Yuan Dong-hai, Guo Xu-jing, Wen Li, He Lian-sheng, Wang Jing-gang, Li Jun-qi
Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Biogas Institute of Ministry of Agriculture, Chengdu 610041, China.
Environ Pollut. 2015 Sep;204:152-60. doi: 10.1016/j.envpol.2015.04.030. Epub 2015 May 14.
Fluorescence excitation-emission matrix (EEM) spectra coupled with parallel factor analysis (PARAFAC) was used to characterize dissolved organic matter (DOM) derived from macrophyte decomposition, and to study its complexation with Cu (II) and Cd (II). Both the protein-like and the humic-like components showed a marked quenching effect by Cu (II). Negligible quenching effects were found for Cd (II) by components 1, 5 and 6. The stability constants and the fraction of the binding fluorophores for humic-like components and Cu (II) can be influenced by macrophyte decomposition of various weight gradients in aquatic plants. Macrophyte decomposition within the scope of the appropriate aquatic phytomass can maximize the stability constant of DOM-metal complexes. A large amount of organic matter was introduced into the aquatic environment by macrophyte decomposition, suggesting that the potential risk of DOM as a carrier of heavy metal contamination in macrophytic lakes should not be ignored.
采用荧光激发-发射矩阵（EEM）光谱结合平行因子分析（PARAFAC）对大型植物分解产生的溶解有机物（DOM）进行表征，并研究其与铜（II）和镉（II）的络合作用。类蛋白质和类腐殖质成分均显示出被铜（II）显著猝灭的效应。成分1、5和6对镉（II）的猝灭效应可忽略不计。类腐殖质成分与铜（II）的稳定常数和结合荧光团的比例会受到水生植物不同重量梯度的大型植物分解的影响。在适当的水生植物生物量范围内进行大型植物分解可使DOM-金属络合物的稳定常数最大化。大型植物分解向水生环境中引入了大量有机物，这表明在大型植物湖泊中，DOM作为重金属污染载体的潜在风险不容忽视。
