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| Binding Characteristics of Heavy Metals with DOM from Different Aquatic Macrophyte Zones |
| Received:June 09, 2015 |
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| KeyWord:DOM;heavy metals;binding characterics;aquatic macrophyte zone |
| Author Name | Affiliation | E-mail | | YU Bo | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | HE Jiang | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | ndjhe@imu.edu.cn | | LÜ Chang-wei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | FAN Ming-de | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | WANG Wei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | ZHANG Rui-qing | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | XIE Zhi-lei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | WANG Jing-hua | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | LI Yu-qing | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | DING Tao | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | EN He | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | |
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| Abstract: |
| Dissolved organic matter(DOM) in aquatic environment can bind with heavy metals, which thus affects the geochemical behaviors of heavy metals. However, DOM from different sources have various binding characteristics with heavy metals. Here we investigated the characteristics of DOM in the overlying water from different aquatic macrophyte zones(Potamogeton pectinatus, Phragmites australis and Myriophyllum spicatum L.) in Lake Wuliangsuhai and its binding characteristics with Cu2+, Pb2+, and Cd2+. Compared with Myriophyllum spicatum L. zone(Myri. zone), DOM from Potamogeton pectinatus zone(Pota. zone) and Phragmites australis zone(Phra. zone) had higher aromaticity, smaller molecular weight, and stronger association with heavy metals, especially with Cu2+, with an association rate of 96%. The DOM from Phra. zone had higher hydroxyl and less carboxyl content than that from other zones, leading to higher saturation binding capacity with heavy metals. On the other hand, DOM from Myri. zone had higher aliphatic compound content, greater molecular weight and larger radius colloid, weakening its binding with heavy metals. In conclusion, DOM from overlying water of different aquatic macrophyte zones has different structural feature such as molecular weight, aliphaticity, and functional group, and shows different binding characteristics with heavy metals. |
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