Comparative study of phosphorus adsorption behaviors in lake sediments over short and long periods of time: implication for the prediction of the release of phosphorus by CaCl₂ and NaHCO₃ extraction

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• 作者：Lidong Huang ; Zhenxuan Li ; Renying Li…
• 关键词：Sediments ; Phosphorus ; NaHCO3 ; CaCl2 ; Adsorption and desorption
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：23
• 期：24
• 页码：25145-25155
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment, general; Environmental Chemistry; Ecotoxicology; Environmental Health; Atmospheric Protection/Air Quality Control/Air Pollution; Waste Water Technology / Water Pollution Control / Water M
• 出版者：Springer Berlin Heidelberg
• ISSN：1614-7499
• 卷排序：23

文摘

Ten sediments were collected from the northern part of Taihu Lake, China. They were incubated for 24 h and 80 days to analyze the adsorption characteristics. After adsorption, the residual sediments were extracted with 0.01 M CaCl₂ and 0.5 M NaHCO₃ separately. Maximum buffer capacities of the Langmuir and Freundlich functions of 80-day incubation were highly correlated with 24 h (R2 = 0.97). A longer time would enhance the resistance of the sediments to P changes in the water. Adsorption and NaHCO₃-P were highly linearly related with R2 > 0.969, but the relationships between 24 h and 80 days were different. The relationships between adsorption and CaCl₂-P could be better explained (97 %) by segmented line models, but the fitting results were affected by incubation time. An interesting finding is that when we plotted the NaHCO₃-P and CaCl₂-P together by a segmented line model, the data showed a uniform trend unrelated to the incubation time. NaHCO₃-P is seldom used to evaluate P status in sediments in comparison with soils. Yet, our results suggested NaHCO₃-P is a good bridge to link the sediments P retention ability and P release risk. Due to its simplicity, NaHCO₃-P has promising potential in predicting the transfer of P from sediments.