[Phosphorus exchange between suspended solids sediments overlying water under repeated disturbance].
The variation of phosphorus (P) exchange between suspended solids, sediments and overlying water under repeated disturbance was investigated, with the sediments from Meiliang Bay (MLB) and Moon Bay (MB) as materials. The results showed that the concentrations of total P (TP) and particulate P (PP) decreased under repeated disturbance. Dissolved total P (DTP) reached equilibrium at 8 d, and was kept at 0.019 mg x L(-1) (MLB) and 0.039 mg x L(-1) (MB). On the contrary, dissolved inorganic P (DIP) increased in the overlying water, due to the highest concentration of NH4Cl-P in the sediments, and then decreased. It reached equilibrium at 8 d, and was kept at 0.013 mg x L(-1) (MLB) and 0.028 mg x L(-1) (MB). It was coincided with the variation of DO. In addition, the concentrations of DTP and DIP in MLB were higher than those of MB under repeated disturbance. The distribution of P forms (NH4Cl-P, Fe/Al-P, HCl-P) changed due to repeated disturbance. During the repeated disturbance, the concentrations of NH4Cl-P, Fe/Al-P and HCl-P decreased gradually. At the same time, the concentrations of TP, PP, DTP and DIP decreased in the overlying water, but the NH4Cl-P, Fe/Al-P, HCl-P increased in the sediments gradually. The trend in MB was not obvious, but the trend was the same as MLB. The results suggested that suspended solids were the medium in the phosphorus exchange between sediments and overlying water under repeated disturbance.
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. ustsldp@163.com
Da-Peng
DP
Li
Jing
J
Wang
Yong
Y
Huang
D002681:China; D003198:Computer Simulation; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; D010758:Phosphorus