Identification of inorganic and organic species of phosphorus and its bio-availability by aequential extraction method in surface sediments of Danjiangkou Reservoir
WANG Wen-wen, WANG Shu-hang, ZHAO Li, JIANG Xia, ZHANG Bo, CHEN Jun-yi
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Forms and occurrence characteristics of organic phosphorus and inorganic phosphorus in surface sediments of Danjiangkou Reservoir were studied by sequential extraction method, and the bio-availability and release risk of phosphorus in various forms were also discussed combining with the spatial distribution characteristics of dissolved total phosphorus (DTP) in interstitial water. Contents of phosphorus with different forms were higher in rivers than that in reservoir area. TP of sampling sites ranged from 203.08 to 1625.61mg/kg, with the mean value of 642.51mg/kg. IP was the main phosphorus form, and IP took 52.9% of TP. Average value of Ca-Pi was 642.51mg/kg, taking 57.8% of IP. Ca-Pi was the main fraction for IP. NA-Po dominated organic phosphorus (OP) in sediments, and the mean value was 180.83mg/kg, taking 59.7% of OP. WA-Pi、PA-Pi、Fe/Al-Pi、WA-Po、PA-Po had significant positive correlations with DTP in pore water, but not significant positive correlation between Ca-Pi, MA-Po, NA-Po and DTP. Both contents of bio-available phosphorus and release flux of sediments from rivers were higher than that of reservoir area, and the release risk for phosphorus was higher.
王雯雯, 王书航, 赵丽, 姜霞, 张博, 陈俊伊. 丹江口水库表层沉积物有机/无机磷形态特征[J]. 中国环境科学, 2016, 36(3): 808-818.
WANG Wen-wen, WANG Shu-hang, ZHAO Li, JIANG Xia, ZHANG Bo, CHEN Jun-yi. Identification of inorganic and organic species of phosphorus and its bio-availability by aequential extraction method in surface sediments of Danjiangkou Reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(3): 808-818.
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