Fluorometric analysis of chlorophyll a in the presence of chlorophyll b and pheopigments

Abstract

A fluorometric method is described which provides sensitive measurements of extracted chlorophyll a free from the errors associated with conventional acidification techniques. Fluorometric optical configurations were optimized to produce maximum sensitivity to Chl a while maintaining desensitized responses from bath Chl b and pheopigments. Under the most extreme Chl b:Chl a ratio likely to occur in nature (1:1 molar), the new method results in only a 10% overestimate of the true Chl a value, while estimates from older acidification meth- ods are 2.5-fold low. Under conditions of high pheopigment concentrations (pheo a : Chl a =1:1 molar), the new method provides Chl a estimates that are equivalent to those determined from the acidification technique. The new simple method requires a single fluorescence determination and provides ad- equate sensitivity for small sample sizes (<200ml) even in the most oligotrophic marine and freshwater environment