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Zinc isotope characteristics in the biogeochemical cycle as revealed by analysis of suspended particulate matter (SPM) in Aha Lake and HongfengLake, Guizhou, China

Li-li LIANG 1,2, Cong-qiang LIU2, Xiang-kun ZHU3,Bryne-T. Ngwenya4, Zhong-liang Wang2, et al.
1. School of Environmental Studies, China University of Geoscience, Wuhan, 430074, China;2. State Key Laboratory of Environmental Geochemistry, Chinese Academy of Science, Guiyang 550002, China;3. Key Laboratory of Isotopic Geology, The Ministry of Land and Resources; Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 4. School of Geosciences, James Hutton Road, University of Edinburgh, The King’s Buildings, Edinburgh EH9 3FE, U.K;5. College of water Sciences, Beijing Normal University, Beijing 100875, China


Zn isotope is a useful tool for tracing biogeochemical processes as zinc plays important role in the biogeochemistry of natural systems. However, Zn isotope composition in the lake ecosystems has not been well characterized. This study aim to investigate the Zn isotope compositions of suspended particulate matter (SPM) and biological samples collected from the Aha Lake and Hongfeng Lake, and their tributaries in summer and winter, in order to explore the potential of this novel isotope system as a proxy for biogeochemical processes in aqueous environments.Concentration of dissolved Zn ranged from 0.65 to 5.06μg/Land 0.74 to 12.04μg/L for Aha Lake and Hongfeng Lake respectively, while the SPM-Zn ranged from 0.18 to 0.70 mg/gand 0.24 to 0.75mg/gfor Aha Lake and Hongfeng Lake respectively. The Zn isotope composition in SPM from Aha Lake and its main tributaries ranged from -0.18‰ to 0.27‰ and -0.17‰ to 0.46‰ respectively, andit varied from -0.29‰ to 0.26‰ and -0.04‰ to 0.48‰ respectively in Hongfeng Lakes and its main tributaries, displaying a wider range in tributaries than lakes. From the results and discussion, they impliedthat Znisotope composition mainly affected by tributaries inputting in Aha Lake, while adsorption process by algeawas major factor for the Zn isotope composition in Hongfeng Lake, andZnS precipitation leads to the light Zn isotope composition of SPM in summer.These data and results provide the basic information of the Zn isotope for the lake ecosystem, and promote the application of Zn isotope in biogeochemistry.

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Keywords:Zn isotope composition; SPM (Suspended particulate matter); Lake; Tributary

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