CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...
CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...
CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Fig.24. Box plot for salicylic acid with resorcinol mixture .................................................30<br />
Fig.25. Scree plot for salicylic acid with resorcinol mixture...............................................30<br />
Fig.26. The degree of overlapping between benzoic and salicylic acid ..............................31<br />
Fig.27. The degree of spectral overlapping between<br />
salicylic acid and resorcinol......................................................................................32<br />
Fig.28. First derivative spectra of pure benzoic acid at<br />
different concentration levels...................................................................................33<br />
Fig.29. First derivative spectra of pure salicylic acid at<br />
different concentration levels...................................................................................33<br />
Fig.30. First derivative spectra for benzoic acid and salicylic acid<br />
indicating the zero-crossing points of each of them .................................................34<br />
Fig.31. First derivative spectra of resorcinol at different<br />
concentration levels ..................................................................................................38<br />
Fig.32. First derivative spectra for salicylic acid resorcinol, indicating the<br />
zero-crossing points of each of them ........................................................................38<br />
Fig.33. Benzoic acid spectral ratio (divisor is 25 µg of<br />
salicylic acid at 3 nm difference intervals) .............................................................43<br />
Fig.34. Benzoic acid derivative ratio ( divisor is 25 µg<br />
salicylic acid at 2 nm difference intervals) .............................................................44<br />
Fig.35. Salicylic acid spectral ratio (divisor is 50 µg/ml<br />
benzoic acid at 4 nm difference intervals) ...............................................................44<br />
Fig.36. Salicylic acid derivative ratio (divisor is 50 µg/ml<br />
benzoic acid at 4 nm difference intervals) ..............................................................45<br />
Fig.37. Salicylic acid spectral ratio (divisor is 25 µg/ml<br />
resorcinol at 3 nm difference intervals) .................................................................49<br />
Fig.38. Salicylic acid derivative ratio (divisor is 25 µg/ml<br />
resorcinol at 3 nm difference intervals) .................................................................49<br />
Fig.39. Resorcinol spectral ratio (divisor is 5 µg/ml<br />
salicylic acid at 1 nm difference intervals) ............................................................50<br />
Fig.40. Resorcinol derivative ratio (divisor is 5 µg/ml<br />
salicylic acid at 1nm difference intervals) ............................................................50<br />
viii