On exposure to LC-50 of cadmium chloride, Ophiocephalaus punctatus alters the physicochemical parameters of water
Abstract
Cadmium is highly toxic to aquatic biota and severely alters the biochemical, physiological and histopathological aspects of organisms. It also induces the change in physico-chemical parameters of water. It is observed that the Cadmium chloride gradually increases the pH, conductivity, free carbon dioxide and total alkalinity of water from 24 hrs to 48 hrs of exposure to Ophiocephalus punctatus. However the temperature and dissolved oxygen showed no appreciable changes as to our expectation. It has been concluded that the increase in pH, conductivity could be due to excretion of negatively charged ions by the fish. Increase in free carbon dioxide might be due to high metabolic rate, total alkalinity as calcium carbonate could be the result of calcium excretion and formation of calcium carbonate after complex chemical reaction
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