Investigation on Short-term Toxicity of Copper and Mercury in Relation to Selected Water Hardness and Temperature to a Freshwater Copepod
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Date
2005
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Publisher
MPUAT, Udaipur
Abstract
In the present study short-term (96 h) toxicity of copper and mercury, separately
and in combination in relation to selected water hardness and temperature to a
freshwater copepod, Cyclops has been evaluated using static bioassay. Median
lethal concentrations (LC50’s) of copper and mercury, separately and in
combination for Cyclops for the time intervals of 24, 48, 72 and 96 hours with
water hardness of 520 mg/l, at a temperature of 18±20C have been recorded
highest as compared to waters of other hardness and at different temperatures
(water hardness of 520 mg/l at a temperature of 30±10C and water hardness of 270
mg/l at both the temperatures, i.e. 30±1 and 18±20C). In comparison to mercury,
copper was found less toxic to Cyclops.
The presumable safe concentrations for Cyclops ranged between 0.373-1.186 mg/l
for copper and 4.011-18.695 μg/l for mercury. These values ranged between
0.322-0.792 mg/l for copper in combination with mercury ions and 6.712-12.885
μg/l for mercury in combination with copper ions at both the water hardness of
270 and 520 mg/l and at both the temperatures of 30±1 and 18±20C. The safe
dischargeable concentrations for copper and mercury separately and in
combination ranged between 1.037-1.125 mg/l and 1.037-1.254 μg/l, respectively.
Description
Investigation on Short-term Toxicity of Copper and Mercury in Relation to Selected Water Hardness and Temperature to a Freshwater Copepod
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Citation
Chaudhary and Gupta, 2005