IN “Fundamental Problems relating to River Pollution” (NATURE, Mar. 26, p. 463), Mr. H. W. Harvey mentions the probable effect of the hydrogen ion concentration on river flora and fauna, and suggests that possibly pH 5.5 is a critical value.
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MENZIES, W. River Pollution and the Acidity of Natural Waters. Nature 119, 638–639 (1927). https://doi.org/10.1038/119638b0
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