“…The effectiveness of digital filters at different data densities has been evaluated (106). Algor-ithms for calculating derivative spectra from recorded zeroorder data have been described (139,183,249) as well as those for determining acidity constants of dibasic acids (172). The improper use of digital signal processors has been discussed, particularly in regard to the types of errors that can occur and their avoidance in the observed absorption spectrum and the Fourier transform power spectrum (493).…”