Abstract
DAS et al. 1 have recently published results on the quantitative and qualitative aspects of plankton of some eutrophic fresh-water lakes of Uttar Pradesh, India ; but no satisfactory information is available regarding the physico-chemical factors bearing upon them. Some work on related fields has been done by Chacko et al. 2 and Alikunhi3, but their results deal only with part of the season in fish-hatching tanks and small bodies of water. In order to get detailed information regarding pH and plankton, regular weekly quantitative hauls were made and water samples obtained in ‘Pyrex’ glass-stoppered bottles. Hydrogen ion concentration was determined for each sample colorimetrically by using Helige comparators and Helige indicator solutions in daylight so far as possible in the field. Carbon dioxide was estimated by making use of phenolphthalein as indicator and the titration was done in Nessler jars in the usual way.
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References
Das, S. M., et al., Proc. Nat. Acad. Sci. (India), 26 (1); 26 (4) ; 27 (3); 29 (4); 29 (4) (1956–59).
Chacko, P. I., et al., Symp. Marine and Freshwater Plankton in the Indo-Pacific, Bangkok (Unesco, 1954).
Alikunhi, K. H., et al., Ind. J. Fisheries, 2 (1955).
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DAS, S. Hydrogen Ion Concentration, Plankton and Fish in Fresh-water Eutrophic Lakes of India. Nature 191, 511–512 (1961). https://doi.org/10.1038/191511b0
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DOI: https://doi.org/10.1038/191511b0
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