COLORIMETRY SPECTROPHOTOMETRY 



123 



little will be absorbed. The actual positions of the maxima and minima 

 depend on the type of molecule. Figure 9-8 shows curves for two pink 

 pigments extracted from different species of algae. Both solutions were 

 pink although there was a noticeable difference in the shade of pink. 



0.9 r- 



u 



c 

 o 



o 

 </> 



< 



440 480 520 560 600 640 

 Wavelength (m/i) 



Fig. 9-8. Absorption spectra of pink pigments ex- 

 tracted from two different species of algae, traced 

 from a record measured by the Gary Model 14 re- 

 cording spectrophotometer. 



