首页|基于光谱特征的多重金属离子与DOM结合特性

基于光谱特征的多重金属离子与DOM结合特性

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通过淬灭滴定实验,文章采用同步荧光光谱和傅里叶红外光谱(FTIR)结合二维相关光谱分析,探究Cu2+和Cd2+多重离子与溶解态有机质(DOM)结合特性.研究结果表明,(1)DOM与Cu2+和Cd2+结合稳定常数(lgKM)分别为4.75～5.18和3.71～4.12,Cu2+与DOM的结合能力要强于Cd2+.(2)Cd2+浓度为0和100 μmol/L时,DOM点位与Cu2+的结合顺序均为430～500 nm＞330～420 nm,且Cd2+存在时Cu2+与DOM的lgKM为4.56～4.95.对比结果表明Cd2+的存在并未影响DOM点位与Cu2+的结合顺序,但减弱了 DOM与Cu2+的结合能力.(3)FTIR结果表明,Cd2+浓度为0和100 μmol/L时DOM官能团与Cu2+结合顺序依次为酚类C—O＞酰胺N—H＞酰胺C=O＞羧基C=O＞芳香族C—H＞多糖C—O和酰胺N—H＞酰胺C=O＞酚类C—O＞芳香族C—H＞多糖C—O.Cd2+与酚类C—O结合后影响了 Cu2+与DOM中酚类C—O和羧基C=O官能团的结合.水环境中多重金属离子共存时的生物有效性和生态风险应受到关注.
Binding Characteristics Between DOM and Multiple Metal Ions:Based on Spectral Features
In this study,synchronous fluorescence spectroscopy and Fourier transform infrared spectroscopy combined with two-dimensional correlation spectroscopy analyses were applied to investigate binding characteristics between dissolved organic matter(DOM)and multiple Cu2+and Cd2+through quenching titration experiments.The results suggested that the binding constant(lgKM)for Cu2+and Cd2+ranged from 4.75～5.18 and 3.71～4.12,respectively,indicating the stronger binding affinity with Cu2+than Cd2+.The binding sequence to DOM for Cu2+both were 430 nm～500 nm＞330 nm～420 nm under 0 and 100 μmol/L Cd2+,and the lgKM for Cu2+ranged from 4.56～4.95 in the presence of Cd2+.The comparative result showed that the presence of Cd2+had no effect on the binding sequence,but attenuate the binding affinity between DOM and Cu2+.FTIR results showed that,the structural changes of DOM upon interaction with Cu2+under 0 and 100 μmol/L Cd2+followed the order of phenolic C—O＞amide N—H＞amide C=O＞carboxyl C=O＞aromatic C—H＞polysaccharides C—O and amide N—H＞amide C=O＞phenolic C—O＞aromatic C—H＞polysaccharides C—O,respectively.The phenolic C—O interacted with Cd2+and then affect the interaction between Cu2+and DOM functional groups,such as phenolic C—O and carboxyl C=O.The bioavailability and ecological risk of heavy metals should be pay close attention under co-existence of heavy metals in wa-ter environments.

fluorescence spectroscopymultiple metal ionsdissolved organic matterfourier transform infrared spectrosco-pytwo-dimensional correlation spectroscopy analyses

胡斌、陈婷、张楠楠、施玥、包天力

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河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏 南京 210024

河海大学环境学院,江苏 南京 210024

江苏环保产业技术研究院股份公司,江苏 南京 210019

江苏省苏力环境科技有限责任公司,江苏 南京 210019

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荧光光谱 多重金属离子 有机质 傅里叶红外光谱 二维相关光谱分析

国家重点研发计划国家自然科学基金项目中央高校科研基本业务费项目

2022YFC320240242007342B220202063

2024

10.19672/j.cnki.1003-6504.0052.24.338

环境科学与技术
湖北省环境科学研究院

环境科学与技术

CSTPCD北大核心
影响因子：0.943
ISSN：1003-6504
年,卷(期)：2024.47(3)