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Characteristics of phosphorus fractions in sediments and its influence on the water quality of Lake Nanyi |
XIE Fa-zhi1, LUO Kun1, ZHU Yuan-rong2, LI Hai-bin1, LI Guo-lian1, LIU Zhan1, LI Wan-lu1, CAI Ge-ge1 |
1. Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei 230601, China; 2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract Fractions of phosphorus (P) in sediments were investigated by using an improved sequential extraction procedure for inorganic P in 39 sampling sites from Lake Nanyi, Xuancheng city, Province of Anhui, China. The relationships between P fractions in sediments, concentrations of P in the overlying water and pore water were analyzed. Results show that the concentrations of total P (TP) in the overlying water of Lake Nanyi were in a high level, which were closely related with concentrations of TP in the pore water. Contents of TP in the sediments of Lake Nanyi ranged from 463.3 to 1016.6 mg/kg. Spatial distribution of P fractions in sediments was significant difference, which was closely related with the inputs of external P. Contents and their relative percentages were decreased in the order that calcium-bound P (Ca-P)>iron-bound P (Fe-P)>aluminium-bound P (Al-P)>reduced soluble P (RS-P)>residual P (Res-P)>loosely absorbed and dissolved P (L-P). Contents of TP in the sediments were significantly correlated with Fe-P, RS-P, Res-P and L-P. Input of external P and aquiculture was likely contributed large of internal Fe-P and RS-P in sediments from Lake Nanyi. The potential risk of internal load of P in sediments was high, which bioavailable P fractions including L-P, Al-P, Fe-P, and Rs-P accounted for 60% approximately. Concentrations of P in pore water were closely related with the spatial distribution characteristics of P fractions in sediments. The main compositions of P including Al-P and Ca-P have important influence on migration and transformation of P in the pore water. The zero equilibrium P concentration (EPC0) value of the sediments from the area of main river estuary ranged from 0.009 to 0.014 mg/L, which showed that the EPC0
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Received: 02 April 2022
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