[Formation mechanism of bioavailable phosphorus in sediments under the conditions of sediment re-suspension].
The concentrations of different sedimentary phosphorus forms and bioavailable phosphorus were studied and the formation mechanism of BAP in sediments was discussed, under the conditions of sediments re-suspension. The results show that sediment re-suspension had obvious effect on the distribution of different sedimentary phosphorus forms. The BD-P, Al-P, Ca-P were increased evidently and the NH4Cl-P was decreased with the time of sediment re-suspension extending. The BAP in sediments after re-suspended was reduced by 6.59%, indicating that sediment re-suspension could promote the transformation from BAP to nonbioavailable phosphorus. The formation of AAP might mainly have close relationships with BD-P. After extracting AAP, the BD-P was decreased by 33.4% averagely in the sediments after re-suspended, while the release of BD-P in sediments from the control experiment was increased by 19.8%, showing that the formation of AAP was affected marked by the properties of BD-P. The Olsen-P could be mainly formed from BD-P, Al-P, NaOH-nrP. The formation of Olsen-P was closely correlated to BD-P, based on the release of BD-P, Al-P, NaOH-nrP.
Li
Da-Peng
DP
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. ustsldp@163.com
Huang
Yong
Y
Li
Wei-Guang
WG
D005591:Chemical Fractionation; D004784:Environmental Monitoring; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; D010758:Phosphorus