end point yield curve
4.alkali and surfactant mainly decrease the resid ual oil saturation while increasing the height of relative permeability curve fo r water phase. The experiments indicated the relations between polymer retention and irreducible water saturation, end?point relative permeability reductions f or water and oil phases, and that between interfacial tension and residual oil s aturation, end?point relative permeability for water phase.
5.Pefloxacin mesylate was precipitated as PEFM TPB in HCl NaAc buffer solution (pH=5.2). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with thallous sulfate standard solution in an alkaline solution. The disappearance of the incision of TPB on dE/dt=f (E) curve was used to indicate the end point of titration.
