a Pictorial representation of the qualitative color reaction with different pesticides in Phosphate Buffer Saline (PBS; pH 7.5). It is observed that among the tested compounds, i.e. neostigmine, malathion, and aluminium phosphide only malathion gives a color detected by inspection. b Pictorial representation of the qualitative color reaction with increasing concentrations of different organophosphorus pesticides added in human urine samples. It is observed that the low concentration of organophosphorus compounds is detectable by inspection following the color reaction
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