Abstract
The industrial waste effluents generally contain heavy metals like Pb, Cr and Cu etc., dumped into rivers. In present study, the toxicity of industrial effluent was investigated using fish “Labeo Rohita” and found that fish was unable to survive even in 15% concentration of the effluent. An interesting feature of the study was that when the pH of the effluent decreased the toxicity of the effluent increased several times. It also found by the study that among three metals Pb, Cr and Cu, Chromium is more toxic than other two metals. The results also shows that the Cr toxicity in enhanced at lower pH- 5.5. This result is in agreement with the already established toxicity which reported that high Cr accumulation occurred at lower pH- 6.5 that of high pH- 7.8. It also established by the present investigation that as the pH decreases, the toxicity of the metal increases.
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