Scan each standard solution and each blank or sample filter extract from 3200 to 2700 cm-1 in absorbance mode vs. CCl4 in reference beam. Record absorbance at wavelength of largest absorbance near 2940 cm-1 (± 11.8%).
Scan each standard solution and each blank or sample filter extract from 3200 to 2700 cm-1 inabsorbance mode vs. CCl4 in reference beam. Record absorbance at wavelength of largestabsorbance near 2940 cm-1 (± 11.8%).