Abstract
Pesticides are the major source of concern as water pollutants. Chlorpyrifos (CPY) (O,O-diethyl-O-(3,5,6-trichloro-2-pyridinyl) phosphorothioate; CAS No. 2921-88-2). CPY is a widely used organophosphate insecticide. The aim of current study was to determine the effects of CPY on the second instar larvae of Culex mosquito as a bio-indicator of water pollution. Levels of CPY in stream water was evaluated. Toxicity of CPY was estimated on mosquito. Along with the evaluation of effects of water polluted with CPY on mosquito to predict the water pollution levels. Results showed that LC95 of CPY was 6331.30 mg/kg after 24hr and increased to 230506.4 ppm after 48hr of exposure. It was noted that the activity of CPY is concentration and time dependent. The 0.09 ppm concentration of CPY (the amount that was found in the stream water) had no effect on the second instar Culex larvae similar to the control (tap water). There is no effect after 72,96h of exposure of the population to the detected insecticide. It could be concluded that mosquito is not a bioindicator of CPY pollution at the detected level in stream water.
Highlights
Persistent organochlorines can accumulate in food chains
The aim of the current study was to determine the adverse effects of some the detected-pesticides (Chlorpyrifos) on the larvae of second instar Culex mosquito larvae as a bio-indicator of aquatic pollution
The present study had been undertaken in order to determine the adverse effects of detected-pesticides (Chlorpyrifos) on the larvae of Culex mosquito larvae as bio-indicator, with a serial number of www.openaccesspub.org IJLI
Summary
Persistent organochlorines can accumulate in food chains. This bioaccumulation has been well documented with the pesticide dichlorodiphenyltrichloroethane (DDT) [1, 2, 3]. Organochlorine pesticides are washed into the aquatic ecosystem by water runoff and soil erosion. Pesticides can drift during application and contaminate aquatic systems samples [4, 5]. Organophosphate pesticides have been the insecticides most commonly used by professional pest control bodies [9]. CPY is a widely used organophosphorus insecticide that is available in a granular formulation for treatment in soil [10]. Pesticides are used to control wide range of pests including Mosquitoes. Mosquito borne diseases infect over 7000000 people every year globally, being prevalent in more than 100 countries across the world [11, 12,13,14]
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