The concentration of the phycoerythrin pigments is measured in 0.1 m phosphate buffer, p H 6.0–7.0, using a sensitive fluorometer. Ten units on our fluorometer are equal to 0.002 OD 1‐cm cell at 540 nm. The maximum variation after extraction is less than 5%. The method is highly suitable for routine analysis at sea or in the laboratory.
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Moreth et al. (1970) studied this question.