I need to calculate the pseudo first order kinetic parameters from the PL spectral data. The reactants include a fluorescent compound (A; used in excess) and different concentration of a fluorescence inhibitor (B). I have the data for F(max)-F(t) vs time. Can I use the formula ln(Fmax-Ft)=ln (Fmax)-kobs*t to calculate. I need to calculate k(obs) from the plot. Can anyone help me how to calculate the pseudo first order kinetic parameters from the data.