中国环境科学 2020,40(11)：4989~4997 China Environmental S cience 微生物降解影响下湖泊草源DOM与重金属的相互作用
任浩宇1，姚昕1,2*，马飞扬1(1.聊城大学环境与规划学院，山东聊城 252000；2.中国科学院南京地理与湖泊研究所，湖泊与环境国家重点实验室，江苏南京 210008)
摘要：通过微生物降解实验以及荧光滴定法研究草源溶解性有机质(DOM)光谱特性的不同以及铜(Cu)与草源DOM在微生物降解影响下的相互作用.三维荧光光谱结合PARAFAC分析显示，草源DOM含有3个荧光组分，新鲜的草源DOM以类蛋白质组分C2为主，微生物降解之后类腐殖质组分C1和C3成为草源DOM中的主要物质.二维相关光谱(2D-COS)，表明类蛋白物质在微生物降解过程中比类腐殖物质有着更高的敏感度和更快降解速率.并且随着Cu的增加，草源DOM中所有组分的荧光强度在微生物降解前后均发生明显猝灭.草源DOM原始样品中类腐殖质组分的络合常数大于类蛋白质组分，说明相比于类蛋白质组分，原始草源 DOM中的类腐殖质组分有着更高的金属结合能力.而类蛋白质组分的络合常数在微生物降解之后的草源DOM中却高于类腐殖质组分.微生物降解对草源DOM的光谱特性以及金属结合能力有着显著影响，并对湖泊中重金属的生物有效性以及生态风险有着重要的意义.
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draw something关键词：可溶性有机质；微生物降解；铜；荧光猝灭；2D-COS；金属结合能力
finish是什么意思中图分类号：X524 文献标识码：A 文章编号：1000-6923(2020)11-4989-09
匈牙利语英文The interaction between macrophytes-derived dissolved organic matter and heavy metal under the influence of microbial degradation. REN Hao-yu1, YAO Xin1,2*, MA Fei-yang1 (1.School of Environment and Planning, Liaocheng University, Liaocheng 252000, China；2.Nanjing Institute of Geography and Limnology, Chine Academy of Sciences, Nanjing 210008, China). China Environmental Science, 2020,40(11)：4989~4997
Abstract：Fluorescence properties of the macrophytes-derived dissolved organic matter (DOM) and the interaction between Cu-binding and macrophytes-derived DOM under the influence of microbial degradation were studied by microbial degradation experiments and fluorescence titrimetric method. Three-dimensional fluorescence spectra combined with PARAFAC analysis showed that macrophytes-derived DOM contained three fluorescence components, i.e., humus-like components C1, C3, and protein-like components C2, and it was dominated by protein- and humus-like components before and after microbial degradation, respectively. 2D correlation spectra (2D-COS) showed that the protein-like substances were more nsitive and had faster degradation rate in the process of microbial degradation compared with the humus-like materials. Meanwhile, with the increasing concentration of Cu2+, the intensity of all fluorescence components was significantly quenched before and after microbial degradation. Compared with the protein-like components, the lo
gKa values of humus-like components of macrophytes-derived DOM before microbial degradation was significantly larger, indicating that humus-like components had a higher metal-binding capacity than protein-like components. However, the logKa values of humus-like components in DOM were smaller than that of protein-like components after microbial degradation. Microbial degradation has a significant impact on the spectral properties and metal-binding capacity of macrophytes-derived DOM, which is meaningful to the bioavailability and ecological risks of heavy metals in lakes.
原来如此日文Key words：dissolved organic matter；microbial degradation；Cu；fluorescence quenching；2D-COS；metal-binding capacity
溶解性有机质(DOM)常见于各种天然水体与土壤中，对水陆生态系统起到极其重要的作用[1-2].由于DOM中含有多种疏水、亲水官能团，如羧基、羟基和羰基等，可通过化学螯合及极性作用等方式与有机污染物相互作用，影响有机污染物在生态环境中的形态、迁移和生物有效性[3-4].湖泊中重金属与DOM之间的相互作用已被广泛报道，然而相关研究经常得到不一致甚至是相反的结论,DOM来源与构成的差异被认为是造成该现象的主要原因之一[3,5-7].
中英文翻译公司湖泊DOM主要受到外源输入和湖泊内源2种输入方式的影响，外源输入多反应人类活动对湖泊的影响.而内源输入主要反映了水生动、植物以及底泥释放等湖泊内部因素对有机质的影响[8-9].草型湖泊是我
国北方较为常见的湖泊类型，大型沉水植物的存在对重金属吸附以及净化水质起到重要作用. 收稿日期：2020-03-09
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基金项目：国家自然科学基金(41977322,41901120)；湖泊科学与环境国家重点实验室开放基金(2018SKL004)；山东省自然科学基金(ZR2019BD052)
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