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| Study on aquatic chemistry characteristics of Bagaxue wetland in Lhasa river basin, Tibet |
| BU Duo1,3, LI Ming-li2, XU Zu-yin2, HUANG Dao-jun1, DAN Zeng1, WU Jianzhaxi1 |
1. Environmental Institute of Tibet University, Lhasa 850000, China;
2. Tibetan Center Laboratory of Geologic Reconnaissance, Lhasa 850000, China;
3. Department of Environmental Science and Engineering, Fudan University, Shanghai 200043, China |
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Abstract Bagaxue wetland is one of an important natural wetland in the Lhasa River basin. We investigated the colority, turbidity, pH, temperature, dissolved oxygen (DO), and 15metal elements in water samples from Bagaxue wetland in the present study. The pH and DO value of water samples collected from Bagaxue wetland were 7.68and 7.01mg/L, respectively. The concentrations of metals were relatively low, Hg and Sn were not detected in all samples. The concentrations of rest 13metal elements followed the order of Fe >Cr >V >Ni >Mn >As >Sb >Mo> Pb >Zn >Cu >Co >Cd. The concentrations of metals in all water samples were under the criterion suggested by GB 3838-2002(The quality I of environmental quality standards for surface water). Compared with the influent of the water of wetland, the colority and turbidity were significantly decreased in effluent water of the wetland. The removal rates of colority and turbidity reached 51.73%、94.8%, respectively. Moreover, the removal rates of individual metal elements were different, the removal rates of V, Cu, Zn, Pb, As, and Mo were 67%, 64.2%, 40.7%, 36.9%, 31.9% and 28.2%, respectively.
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Received: 29 June 2015
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