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Environmental Engineering Research 2001;6(3): 131-138.
ACUTE TOXICITY OF COPPER IN FLOW-THROUGH SYSTEM WITH SUSPENDED PARTICLES
Sang Don Kim
Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, Kwangju 500-712, Korea
Corresponding Author: Sang Don Kim ,Tel: +82-62-970-2445, Fax: +82-62-970-2434, Email: sdkim@kjist.ac.kr
Received: March 19, 2001;  Accepted: July 19, 2001.
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ABSTRACT
The effect of kinetics of copper binding to particulate matter from the Susquehanna River on copper toxicity to Ceriodaphnia dubia was investigated using batch and continuous flow-through bioassay system. The toxicity of copper to C. dubia decreased in the presence of particles and with increasing the copper-particle reaction limes (i.e., increasing HRT). lloweer. in contrast to the results obtained for HA and DOM, the bioassay data for copper reaction with particles showed that the percent mortality of C. dubia was not different between HRT of 6 and 24 h. This result indicated that the reaction of copper with particulate is faster than HA and DOM as the reaction was completed within 6 h. The normalization of bioassay results with free copper ions indicated that C. dubia is more sensitive to free copper ions in the presence of particulate than when HA or DOM was presem. The deviation from the regression line (free copper dose-response line) that had been obtained for the DOM bioassay test may be attributed to the physical stress resulting from the presence of particles and weak adsorption reaction of Cu with particles.
Keywords: copper | kinetics | particles | toxicity
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