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Bioconcentration of haloxyfop-methyl in bluegill (Lepomis macrochirus rafinesque)
Abstract Bluegill (Lepomis macrochirus Rafinesque) were exposed to a 14C haloxyfop-methyl [methyl 2-(4-((3-chloro-5-(trifluoromethyl)-2-pyridinyl)oxy)phenoxy) propanoatel] concentration averaging 0.29 μg/L under flow-through conditions for 28 days. At the end of 28 days, the fish were transferred to clean water for a 4-day flow-through clearance period. Bluegill were found to rapidly absorb the ester from water which was then biotransformed at an extremely fast rate within the fish, such that essentially no haloxyfop-methyl was detected in the fish. The estimated bioconcentration factor for haloxyfop-methyl in whole fish was <17, based upon the detection limit for the ester in fish (0.005 μg/g) and the average concentration of haloxyfop-methyl in exposure water (0.29 μg/L). The principal component of the 14C residue within whole fish was haloxyfop acid [2-(4-((3-chloro-5-(trifluoromethyl)-2-pyridinyl)oxy)phenoxy)propanoic acid] which accounted for an average of about 60% of the total radioactivity. The high rate of biotransformation of the parent compound within the fish demonstrates the importance of basing the bioconcentration factor upon the actual concentration of parent material within the organism rather than the total radioactive residue levels for bioconcentration studies with radiolabeled compounds.
Bioconcentration of haloxyfop-methyl in bluegill (Lepomis macrochirus rafinesque)
Abstract Bluegill (Lepomis macrochirus Rafinesque) were exposed to a 14C haloxyfop-methyl [methyl 2-(4-((3-chloro-5-(trifluoromethyl)-2-pyridinyl)oxy)phenoxy) propanoatel] concentration averaging 0.29 μg/L under flow-through conditions for 28 days. At the end of 28 days, the fish were transferred to clean water for a 4-day flow-through clearance period. Bluegill were found to rapidly absorb the ester from water which was then biotransformed at an extremely fast rate within the fish, such that essentially no haloxyfop-methyl was detected in the fish. The estimated bioconcentration factor for haloxyfop-methyl in whole fish was <17, based upon the detection limit for the ester in fish (0.005 μg/g) and the average concentration of haloxyfop-methyl in exposure water (0.29 μg/L). The principal component of the 14C residue within whole fish was haloxyfop acid [2-(4-((3-chloro-5-(trifluoromethyl)-2-pyridinyl)oxy)phenoxy)propanoic acid] which accounted for an average of about 60% of the total radioactivity. The high rate of biotransformation of the parent compound within the fish demonstrates the importance of basing the bioconcentration factor upon the actual concentration of parent material within the organism rather than the total radioactive residue levels for bioconcentration studies with radiolabeled compounds.
Bioconcentration of haloxyfop-methyl in bluegill (Lepomis macrochirus rafinesque)
Murphy, P.G. (author) / Lutenske, N.E. (author)
Environmental International ; 16 ; 219-230
1990-01-12
12 pages
Article (Journal)
Electronic Resource
English
Histological examination of sublethal effects of diazinon on ovary of bluegill, Lepomis macrochirus
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