Abstract
IT is known that certain motile Protozoa and Bacteria gather near the surface film in water containing organic matter. Polytoma uvella, Ehr. (Fig. 1), one of the Phytoflagellata, in narrow upright tubes rests in a stable zone about 4 mm. below the meniscus, and this reaction may be utilised in detecting organic impurities in water and estimating the biochemical oxygen demand of sewage and sewage effluents.
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LLOYD, L. Biological Estimation of the Quality of Sewage Effluents. Nature 129, 577–578 (1932). https://doi.org/10.1038/129577a0
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DOI: https://doi.org/10.1038/129577a0
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