title: Phosphorus fractions and the effect of pH on the phosphorus release of the sediments from different trophic areas in Taihu Lake, China.
abstract: The sediment characteristics, different phosphorus (P) fraction concentrations and the effect of pH on P release were investigated in a shallow eutrophic lake in China. The total phosphorus (TP) concentrations in the sediments ranged greatly from 420 to 3408 mg kg(-1) and inorganic P (IP) was the main P fraction. For the heavily eutrophic sediment, IP mainly consisted of NaOH-P; while for the mesotrophic sediments, IP mainly consisted of HCl-P. The rate of P release decreased as pH increased from 2 to 6. But it increased as pH increased from 8 to 12. It is suggested that high pH promoted the release of NaOH-P, and low pH promoted the release of HCl-P, and there was no P release occurring in the neutral condition.
authors.affiliation: Research Center of Lake Environment, Chinese Research Academy of Environment Sciences, 100012 Beijing, China. jinxiang@public.bta.net.cn
authors.forename: Xiangcan
authors.initials: X
authors.lastname: Jin
authors.forename: Shengrui
authors.initials: S
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Pang
authors.forename: Feng
authors.initials: F
authors.lastname: Chang Wu
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D006851:Hydrochloric Acid; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010758:Phosphorus / Q000032:analysis*; D012972:Sodium Hydroxide; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D012972:Sodium Hydroxide; D006851:Hydrochloric Acid