摘要
为揭示南水北调中线工程水体中溶解性有机质(Dissolved Organic Matter,DOM)的组成变化特征,采集南水北调中线总干渠沿线及丹江口水库水样,利用傅里叶变换离子回旋共振质谱(Fourier Transform Ion Cyclotron Resonance Mass Spectrometry,FT-ICR MS)分析了DOM的分子组成及其空间变化,并探讨了总干渠沿线DOM变化成因和环境意义。结果表明:丹江口水库和总干渠均检出DOM物质3200余种,仅含C、H和O的物质(CHOs)为主要组分,约占所有检出物质的61%,含C、H、O和N的物质(CHONs)占30.5%~31.5%,含C、H、O和S的物质(CHOSs)仅占7.3%~8.4%,结合O/C和H/C分类,丹江口水库和总干渠水体DOM主要组分为木质素(60%以上)。相较于丹江口水库,总干渠水体DOM组分发生了较大变化,蛋白质类组分占比由3.70%升至8.65%,表明总干渠中有蛋白质生成;稠环类物质占比由9.43%下降至4.77%,单宁酸类的变化趋势与稠环类物质类似。总干渠局部区域藻类增殖过程是引起总干渠中CHONs和CHOSs类DOM组分和占比升高的主要原因。研究成果可为科学认识南水北调中线工程水体水质变化过程提供科学依据。
In order to reveal the composition variation characteristics of dissolved organic matter(DOM)in the water of the Middle Route of South-to-North Water Diversion Project,we collected water samples in the main channel of the Middle Route of South-to-North Water Diversion Project and Danjiangkou Reservoir,and analyzed the molecular composition and spatial variation of DOM by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry(FT-ICR MS).The causes and environmental significance of DOM changes along the main canal were explored.The results showed that more than 3200 kinds of DOM substances were detected in the Danjiangkou Reservoir and the main canal.Substances only containing C,H,and O(CHOs)were the main components,accounting for 61%of all detected substances;substances containing C,H,O,and N(CHONs)accounted for 30.5%~31.5%;while substances containing C,H,O,and S(CHOSs)only accounted for 7.3%~8.4%.Based on the O/C and H/C classification,the main component of DOM in both the Danjiangkou Reservoir and the main canal was lignin(over 60%).Compared with the Danjiangkou Reservoir,the composition of DOM in the water of the main canal has undergone significant changes,with the proportion of protein-like substances increasing from 3.70%to 8.65%,indicating the generation of protein in the main canal;the proportion of condensed ring-like substances decreased from 9.43%to 4.77%,and the trend of tannic acid-like substances was similar to that of condensed ring-like substances.The main reason for the increase in the proportion of CHONs and CHOSs-like DOM components in the main canal was the local algae proliferation process.The research results can provide a basis for the scientific understanding of the water quality changes of the Middle Route of the South-to-North Water Diversion Project.
作者
都诚
王超
郝智能
岳前升
张洪
DU Cheng;WANG Chao;HAO Zhineng;YUE Qiansheng;ZHANG Hong(College of Chemistry&Environmental Engineering,Yangtze University,Jingzhou 434000,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Changjiang Water Resources Protection Institute,Wuhan 430051,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《人民长江》
北大核心
2023年第3期56-62,共7页
Yangtze River
基金
国家自然科学基金项目(22176199,52270202)。
关键词
溶解性有机质
超高分辨质谱
跨流域调水
南水北调中线工程
dissolved organic matter
ultra-high resolution mass spectrometry
inter-basin water transfer
Middle Route of South-to-North Water Diversion Project
