Acute toxicity of cadmium to fish Labeo rohita and copepod Diaptomus forbesi pre-exposed to CaO and KMnO4.
96-h LC50 values of cadmium (Cd) to fish Labeo rohita and the copepod Diaptomus forbesi, determined by static bioassays, were, respectively, 89.5 and 10.2 mg/l. LC50 values increased significantly when fish pre-exposed to 100-350 mg/l CaO or 0.5-1.5 mg/l KMnO4 for 4 d and the copepod to 20-70 mg/l CaO or 0.25-1.0 mg/l KMnO4 for same period. The LC50 values also increased when the pre-exposure period of CaO was increased to 12 d at concentration 100 mg/l for fish and 20 mg/l for copepod. All fish died when pre-exposed to 1.5 mg/l KMnO4 for 8 d. But LC50 values of Cd to copepod increased when pre-exposure period of 0.5 mg/l KMnO4 was increased from 4 to 8 d.
Dutta
T K
TK
Department of Zoology, University of Kalyani, Nadia, India.
Kaviraj
A
A
D000222:Adaptation, Physiological; D000818:Animals; D002104:Cadmium / Q000633:toxicity*; D017610:Calcium Compounds / Q000008:administration & dosage / Q000737:chemistry / Q000633:toxicity*; D003445:Crustacea; D004347:Drug Interactions; D005399:Fishes; D007928:Lethal Dose 50; D010087:Oxides / Q000008:administration & dosage / Q000737:chemistry / Q000633:toxicity*; D010545:Peroxides / Q000008:administration & dosage / Q000737:chemistry / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D017610:Calcium Compounds; D010087:Oxides; D010545:Peroxides; D014874:Water Pollutants, Chemical; C097259:potassium manganese peroxide; D002104:Cadmium; C016538:lime