[Regeneration and transformation of BAPP in suspended solids under short term sediment disturbance].

The change of phosphorus forms in suspended solids under short-term sediment disturbance of different modes and its influence on BAPP in suspended solids were investigated, using sediments and overlying water from Meiliang Bay. The results showed that the concentrations of DIP in the overlying water decreased under disturbance. The concentrations of DIP under continuous disturbance were lower than those under intermittent disturbance. The NH4Cl-P, Ca-P and Res-P concentrations increased by 2.97%, 12.23%, 4.09% under continuous disturbance and 3.53%, 10.35%, 2.07% under intermittent disturbance and the non-occluded Fe/Al-P decreased by 5.55% under continuous disturbance and 1.78% under intermittent in suspended solids during the experiment, indicating that sediment disturbance could promote the transformation of sedimentary phosphorus from mobile forms to refractory forms. According to the speculation, the content of BAPP should decrease. However, it increased from 20.68% (initial state) to 49.27% (average, under continuous disturbance) and 57.92% (average, under intermittent disturbance). This result indicated that it is problematic to estimate the BAPP using solely the mobile phosphorus forms, such as NH4 Cl-P and non-occluded Fe/Al-P.