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Effect of copper binding by suspended particulate matter on toxicity
Author(s) -
Ma Huizhong,
Kim Sang Don,
Allen Herbert E.,
Cha Daniel K.
Publication year - 2002
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620210404
Subject(s) - particulates , environmental chemistry , copper , toxicity , chemistry , copper toxicity , environmental science , organic chemistry
The kinetics of Cu(II) interactions with Susquehanna River (mid‐Atlantic, USA) particle suspensions using the copper ion selective electrode (Cu‐ISE) method indicated that the concentration of Cu 2+ in both the suspension and filtrate was kinetically controlled; the reaction of Cu(II) in the suspension was faster than that in the filtrate. Bioassay tests were performed in continuous flow‐through bioassay systems to examine the effect of kinetics of Cu(II) interactions with suspended solids on the toxicity of Cu to Ceriodaphnia dubia . The toxicity curves were displaced to higher total Cu concentration as the reaction time increased, indicating that such interaction of Cu with solids was time dependent. Further, the toxicity curves overlapped for reaction times of 6 and 24 h, indicating that the reaction was relatively rapid and that equilibrium was achieved within 6 h. The survival of organisms was related to the free Cu 2+ concentration but deviated from the result for bioassays in which dissolved organic matter (DOM) rather than particles reacted with the added Cu(II) to affect the free Cu 2+ concentration. It may be interpreted that, besides the toxic effect of Cu 2+ , particles exert adverse influences on the organisms.