Assertion: chlorophyll | /r/HasProperty | a. hallegraeff
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Source sentences:
text: Hallegraeff (1976) found magnesium-containing degradation products, on some dates, to comprise over 50% of what would have been estimated as chlorophyll a. Hallegraeff (1976), as well as a number of other authors, emphasize that the acidification technique really eliminates only the interference of non-manganese-containing pigments.