Ammonium release characteristics of the sediments from the shallow lakes in the middle and lower reaches of Yangtze River region,China |
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| Authors: | Juan Wang Shengrui Wang Xiangcan Jin Shuquan Zhu Fengchang Wu |
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| Institution: | (1) School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, China;(2) State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, Chaoyang District, Anwai Da Yangfang, Beijing, 100012, China;(3) State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China |
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| Abstract: | Ammonium release from sediments has significant effects on the water quality in eutrophic lakes. In this study, the ammonium
release kinetics and adsorption–desorption processes were investigated in 13 sediments of 6 shallow lakes from the middle
and lower reaches of Yangtze River region, China. The results show that First Order Model best described the ammonium release
process, the maximal release capacity had a strong correlation with organic matter (OM), cationic exchange capacity (CEC),
total nitrogen (TN) and total phosphorus (TP). But it only had a weak correlation with Fe, Ca and Al. The ammonium release
capacity in more polluted sediments was higher than that in less polluted sediments. The average release rate within 0–5 min
was the highest among the experimental period, the amount released within 0–5 min accounted for approximately 50–70% of the
total release capacity. The ammonium release rate had a significant and positive correlation with OM. But it did not have
a strong correlation with TN, TP, Fe, Ca and Al. The ammonium potential release capacity (obtained when the water/sediment
ratio was about 2,500) had strong and positive relation with OM and maximal release capacity, and it may provide useful information
for the sediment release risk assessment. Henry Model best described the ammonium sorption isotherms, and ammonium adsorption–desorption
equilibrium concentration can be considered as the ammonium release threshold to assess the release risk in the sediments. |
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| Keywords: | Ammonium Release Kinetics Lake Sediments |
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