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Aquatic organisms as biomarkers of insecticide residues [electronic resource].

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El-Tantawy, M. A

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Language: English Summary language: Arabic Description: p.1615-1629Other title:

الكائنات المائية ككواشف لمتبقيات المبيدات [Added title page title]

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Zagazig journal of agricultural research, 2005 v. 32 (5) [electronic resource].

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In: Zagazig Journal of Agricultural Research 2005.v.32(5)Summary: Three organophosphorus insecticides ( malathion, profenofos, and chlorpyrifos) were tested to determine their toxicity against the four larval instars of the mosquito Culex pipiens L. , the adult stage of the water flea Daphnia magna (Straus) and two ages of the Nile Bolti Oreochromis niloticus (one and seven -days- old). Residues of one of the three preceding insecticides, malathion, were analyzed on and in squash fruits chcmically , using the colorimetric and gas chromatography methods, as well as biologically using the three tested organisms as biomarkers . Regarding the acute toxicity, it was found that mosquito larvae exhibited the highest sensitivity to all insecticides tested ; 24h LC50 values ranged between 0.013 to 0.044 , 0.023 to 0.557 , and 0.047 to 0.086 ug / L. for profenofos, malathion, and chlorpyrifos , respectively.

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Three organophosphorus insecticides ( malathion, profenofos, and chlorpyrifos) were tested to determine their toxicity against the four larval instars of the mosquito Culex pipiens L. , the adult stage of the water flea Daphnia magna (Straus) and two ages of the Nile Bolti Oreochromis niloticus (one and seven -days- old). Residues of one of the three preceding insecticides, malathion, were analyzed on and in squash fruits chcmically , using the colorimetric and gas chromatography methods, as well as biologically using the three tested organisms as biomarkers . Regarding the acute toxicity, it was found that mosquito larvae exhibited the highest sensitivity to all insecticides tested ; 24h LC50 values ranged between 0.013 to 0.044 , 0.023 to 0.557 , and 0.047 to 0.086 ug / L. for profenofos, malathion, and chlorpyrifos , respectively.

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