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| Authors: | Yanhong Wu Xinhua Hou Xiaoying Cheng Shuchun Yao Weilan Xia Sumin Wang |
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| Institution: | (1) Key Laboratory of Lake Sedimentation and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China;(2) The Key Laboratory of Industrial Biotechnology, Ministry of Education, Southern Yangtze University, Wuxi, 214036, China |
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| Abstract: | Metals in lacustrine sediment have both anthropogenic and natural sources. Because of intensified human activities, the anthropogenic
input of metal elements has exceeded the natural variability. How to distinguish the anthropogenic sources in lake sediments
is one of the tasks in environmental management. The authors present a case study, which combined the geochemical and statistical
methods to distinguish the anthropogenic sources from the natural background. A 56 cm core (core DJ-5) was collected from
Dongjiu Lake, Taihu Lake catchment, China. The concentration distributions of Al, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg,
Mn, Na, Ni, Pb, Sr, Ti, V and Zn in core DJ-5 indicated that Dongjiu Lake had serious Cd pollution, and the concentrations
of Cr, Cu, Pb, Mn and Zn had also exceeded the Chinese State Standards of Soil Environmental Quality in the upper layer of
the core. Using Al as a reference element, the other metals were normalized and compared with their baselines to calculate
the enrichment factors (EFs). The principal component analysis (PCA) of metal concentrations was performed using ViSta6.4.
The results of EFs and PCA indicated that the concentration variations of Cd, Cu, Pb, Mn and Zn were mainly caused by the
anthropogenic sources, and the concentration variations of Cr and Ni were influenced by both the anthropogenic and natural
factors, while the other metals were mainly derived from the natural sources. Intensified human activities within the lake
catchment area resulted in the increase of heavy metal inputs directly and the acceleration of erosion which caused other
metal elements to deposit in the aquatic environment. The results of this work will be useful in probing changes forced by
humans in the lake environment and in adjusting human activity in restoring the lake environment.
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| Keywords: | Metal element Principal component analysis Enrichment factors Human activity Anthropogenic sources Dongjiu Lake China |
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