Fig. 5

a First derivative of the ratio spectra of MOM when 1 μg/mL IND was used as the divisor and b first derivative of the ratio spectra of IND when 1 μg/mL MOM was used as the divisor
a First derivative of the ratio spectra of MOM when 1 μg/mL IND was used as the divisor and b first derivative of the ratio spectra of IND when 1 μg/mL MOM was used as the divisor