| 城郊与城镇河流中溶解性有机质与重金属的相关性 |
| 摘要点击 2904 全文点击 841 投稿时间：2017-10-13 修订日期：2017-11-13 |
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| 中文关键词 溶解性有机质 三维荧光 重金属 相关性 樟溪 芦江 |
| 英文关键词 dissolved organic matter excitation-emission matrix fluorescence heavy metals correlation Zhangxi River Lujiang River |
| 作者 | 单位 | E-mail | | 梁梦琦 | 安徽师范大学生命科学学院, 安徽省高校生物环境与生态安全省级重点实验室, 芜湖 241000 | mengqiliangcp@163.com | | 邵美玲 | 安徽师范大学生命科学学院, 安徽省高校生物环境与生态安全省级重点实验室, 芜湖 241000 | | | 曹昌丽 | 中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
中国科学院宁波城市环境观测研究站, 宁波 315830 | | | 纵亚男 | 安徽师范大学生命科学学院, 安徽省高校生物环境与生态安全省级重点实验室, 芜湖 241000
中国科学院宁波城市环境观测研究站, 宁波 315830 | | | 唐剑锋 | 中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
中国科学院宁波城市环境观测研究站, 宁波 315830 | jftang@iue.ac.cn |
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| 中文摘要 |
| 溶解性有机质（dissolved organic matter，DOM）在水体环境中广泛存在，对重金属在水环境中的环境行为有重要影响.本研究为探讨DOM与重金属的相关性，以宁波市城郊流域樟溪和城镇流域芦江为例，利用三维荧光技术分析不同城镇化梯度下河流水体溶解性有机质（DOM）的结构组成特征，分析DOM各项参数与重金属之间的相关性.结果表明，城镇化程度较高的河流水体具有较高的DOC、有色溶解性有机质（CDOM）和荧光溶解性有机质（FDOM）浓度；城郊流域与城镇流域水体中DOM均含有4个荧光峰，类富里酸荧光峰A和C以及类蛋白荧光峰B和T，且城镇流域水体荧光峰B和T的强度显著高于城郊流域，DOM腐殖化程度与芳香性也具有同样的趋势；城镇流域水体中重金属As、Cu和Mn浓度显著高于城郊流域.DOM与重金属的相关性结果表明，城镇河流中DOM与Cu、Cr、Mn、As、Zn和Pb都存在显著的正相关关系，而城郊河流中DOM只与Mn、Pb和Cu呈显著正相关，与其它重金属相关性不明显.总之，城镇化水平影响河流水体中CDOM的浓度和性质，而CDOM浓度和性质与重金属的行为密切相关. |
| 英文摘要 |
| Dissolved organic matter (DOM) is ubiquitous in the aquatic environment, playing an important role in the fate of heavy metals in aquatic systems. In this study, we characterized the DOM and heavy metals and their distribution in a peri-urban river and an urban river in Ningbo city. In addition, the relationship between DOM and dissolved heavy metals was also determined. Results showed that higher DOC, CDOM, and FDOM concentrations were found in the river with the higher urbanization level. Four fluorescence peaks were identified in the excitation-emission matrix (EEM) of DOM, including fulvic acid-like fluorescence peaks A and C and protein-like fluorescence peaks B and T. The higher fluorescence intensities of peak B and T were found in the urban river, and similar trends were also found for the degree of humification and aromaticity of DOM. Similarly, concentrations of heavy metals, such as As, Cu, and Mn, were significantly higher in the urban river. Moreover, DOM had significant positive correlations with Cu, Cr, Mn, As, Zn, and Pb in the urban river, while DOM only exhibited significant positive correlations with Mn, Pb, and Cu in the peri-urban river. In conclusion, urbanization level influenced the characteristics and concentrations of CDOM in rivers which were closely related to the distribution of heavy metals. |
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