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Chlorophyll a determinations were made on lakewater and algal samples by spectrophotometric, fluorometric and high performance liquid chromatographic methods. Acetone, methanol and ethanol solvents were evaluated for their ability to extract photosynthetic pigments from Scenedesmus sp. cultures. Routinely used methods overestimated the chlorophyll a concentrations present in the samples. Significant differences resulted when various standard equations were used to calculate chlorophyll a concentrations. Acetone did not quantitatively extract chlorophyll pigments, even after 24 h. Mechanical disruption was found to be important in assuring complete extraction of the chlorophyll pigments.
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Jacobsen et al. (1990) studied this question.
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