[Distribution of phosphorus species in the sediment from Weishanhu district in Lake Nansihu].
In order to learn the phosphorus (P) species distribution in sediments of Lake Nansihu, 0-25 cm sediments from Weishanhu district in Lake Nansihu were analyzed with a sequential extraction method. The results show that: the average values of Ex-P, Al-P, Fe-P, Oc-P, Ca-P, De-P, Org-P in Weishanhu district sediments are 5.62 mg/kg, 4.08 mg/kg, 12.25 mg/kg, 13.34 mg/kg, 116.67 mg/kg, 232.36 mg/kg and 396.79 mg/kg respectively, and the rank order of P-fractionation for Lake Nansihu is Al-P < Ex-P < Fe-P < Oc-P < Ca-P < De-P < Org-P. The vertical phosphorous species distribution exhibits the obvious rule that exchangeable P (Ex-P), Fe-bound P (Fe-P), occluded P (Oc-P), organic P (Org-P) value decrease with depth, while the values of Al-bound P (Al-P), authigenic calcium bound P (A Ca-P), detrital apatite P (De-P) increase. The Sum1 content (the sum of Ex-P, Al-P and Fe-P) in surficial sediments is remarkably positively correlated with the PO4(3-) concentration of overlaying water, to which Fe-P content contributes the most with the correlation index 0.72. In spatial phosphorous species distribution, the discrepancy of potential active species(Ex-P, Al-P and Fe-P) is greater than those inert ones (Oc-P, Ca-P and De-P), and Org-P is only second to those potential active species.
Zhang
Zhi-Bin
ZB
College of Environmental and Municipal Engineering, Shandong Architecture University, Ji'nan 250101, China. zhazhb@163.com
Zhang
Xue-Yang
XY
Zhang
Bo
B
Li
Mei
M
Huang
Qing-Hui
QH
Li
Jian-Hua
JH
D002681:China; D004784:Environmental Monitoring; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
D014874:Water Pollutants, Chemical; D010758:Phosphorus