| 派河及其支流溶解性有机质分子组成特征 |
| 摘要点击 2835 全文点击 1001 投稿时间：2021-08-17 修订日期：2021-08-28 |
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| 中文关键词 溶解性有机质(DOM) 静电场轨道阱质谱仪 分子组成 派河 来源 |
| 英文关键词 dissolved organic matter(DOM) orbitrap mass spectrometry molecular distribution Paihe River source |
| 作者 | 单位 | E-mail | | 詹亚 | 安徽大学资源与环境工程学院, 安徽省矿山生态修复工程实验室, 合肥 230601 | x19301078@stu.ahu.edu.cn | | 尹浩 | 中国科学技术大学地球与空间科学学院, 合肥 230026 | | | 冯景伟 | 合肥工业大学土木与水利工程学院, 安徽省农村水环境治理与水资源利用工程实验室, 合肥 230009 | | | 冯艾荣 | 中国科学技术大学理化科学实验中心, 合肥 230026 | | | 胡艳云 | 中国科学技术大学理化科学实验中心, 合肥 230026 | | | 张浏 | 安徽省环境科学研究院, 合肥 230071 | zlbod5@163.com | | 郑刘根 | 安徽大学资源与环境工程学院, 安徽省矿山生态修复工程实验室, 合肥 230601 | lgzheng@ustc.edu.cn |
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| 中文摘要 |
| 溶解性有机质（DOM）是水生生态系统中的重要组成部分，派河作为"引江济淮"清水廊道工程江淮段的唯一输水通道，其DOM分子层面的组成信息和特性尚不明确.利用静电场轨道阱高分辨质谱技术对派河及其支流（光明大堰河）DOM分子进行表征，并且利用皮尔逊（Pearson）相关性分析和主成分分析（PCA）研究两条河流DOM的分子组成信息、特性和来源间的关系.结果表明，派河DOM的相对分子质量与含氧量相对较低；光明大堰河DOM分子的相对分子质量、芳香性和不饱和度相对较高.从元素组成和化合物组成看，两条河流主要以CHO类化合物和来源于陆地植物的木质素与单宁化合物为主，DOM分子均受到陆源DOM的强烈影响，派河DOM中还存在较高百分比CHOS类、蛋白质和脂质化合物.结合Pearson相关性分析和PCA分析结果，派河DOM还受到生活污水与污水处理厂尾水汇入、城市化进程加剧和微生物活动的影响.结果可为派河流域DOM时空组成变动研究提供详细资料，并为派河清水廊道工程提供技术支撑. |
| 英文摘要 |
| Dissolved organic matter (DOM) is an abundant and critical component of aquatic ecosystems, participating in many physicochemical and biogeochemical processes. The Paihe River is the only inflow river in the Jianghuai section of "Yangtze-Huaihe water diversion" clear water gallery project; however, its DOM molecular composition information and characteristics are still unclear. In this study, the molecular characterization of DOM in the Paihe River and Guangming Dayan River was determined using Orbitrap mass spectrometry. The Pearson's correlation and principal component analysis (PCA) were used to study the relationship between molecular composition information, characteristics, and sources of DOM in two rivers. The results showed that the molecular weight and oxygen content of DOM molecules in the Paihe River were relatively low; the molecular weight, aromaticity, and unsaturation of DOM molecules in the Guangming Dayan River were relatively high. From the element composition and compound composition of the two rivers' DOM, both rivers were mainly composed of CHO-compounds, lignin, and tannins derived from land plants, which indicates that both rivers were severely affected by terrestrial input. There were high percentages of CHOS, protein, and lipid compounds of DOM in the Paihe River. According to the results of the Pearson's correlation and PCA analyses, the DOM molecules of the Paihe River were also influenced by wastewater from sewage treatment plants, urbanization processes, and microbial activity. Molecular composition information and characteristics of DOM can provide a detailed reference to improve the theoretical support for the Paihe River clear water gallery project. |
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