The ratio carbon to chlorophyll varies enormously, from 5 to 345 mg C/mg
Chl... The Chl content in the cell depends on its physiological state, and
different species have different C:Chl. For instance, diatoms have a lower
C:Chl and dinoflagelattes have a higher C:Chl. I'm attaching a paper
published in Marine Pollution Bulletin about this subject (see section 2.3).
I hope it will help!