Abstract
Specimens of fresh water fish,Notopterus notopterus were exposed to phenol (P), 2,4-dinitrophenol (DNP) and pentachlorophenoi (PCP) separately, and to their three combinations: (PCP + DNP)/P (highly antagonistic), (DNP + P)/PCP (additive) and (P + DNP)/PCP (highly synergistic) at three dissolved oxygen (DO) levels, i.e. 5.0 ± 0.2 mg 1−1, 6.5 ± 0.2 mg 1−1 and 7.8 ± 0.2 mg 1−1 for 96 h to evaluate the influence of DO on toxicity of phenolic compounds individually and in combination. The present investigation reveals that a decrease in DO level from 6.5 ± 0.2 to 5.0 ± 0.2 mg 1−1 increased the toxicity of P, DNP, PCP, (PCP + DNP)/P, (DNP + P)/PCP and (P + DNP)/PCP by 88.0, 188.01, 219.0, 123.01, 152.0, and 610.0%, respectively, while an increase in DO level from 6.5 ± 0.2 to 7.8 ± 0.2 mg 1−1 decreased their toxicity by 31.0, 31.6, 22.5, 23.1, 43.9, and 54.9%, respectively. These results suggest that toxicity of phenolic compounds is influenced by DO levels.
Published Version
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