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 CaCl2and NaHCO3extraction.
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 CaCl2and 0.5 M NaHCO3separately. 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.
Jiangsu Provincial Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China. ldhuangnz@163.com.
Lidong
L
Huang
School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Zhenxuan
Z
Li
Jiangsu Provincial Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Renying
R
Li
Jiangsu Provincial Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Hongsheng
H
Wu
D000327:Adsorption; D002122:Calcium Chloride / Q000737:chemistry*; D002681:China; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes; D008962:Models, Theoretical; D010758:Phosphorus / Q000737:chemistry*; D017693:Sodium Bicarbonate / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D014874:Water Pollutants, Chemical; D010758:Phosphorus; D017693:Sodium Bicarbonate; D002122:Calcium Chloride
Adsorption and desorption; CaCl2; NaHCO3; Phosphorus; Sediments
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