A Study of Adsorption and leachability of Monuron on Five Soils and Implications Concerning Groundwater Contamination
Publication Date : 31/01/2020
The aim of this study was to determine monuron herbicide contamination in surface and ground water. The adsorption of herbicide on five soils of different characteristics has been carried out by using a batch equilibrium technique at two different temperatures viz 25oC and 35oC. A spectrophotometric methodology has been developed based on the reaction of dimethyl amine (formed from hydrolysis of monuron with potassium tert.-butoxide) with carbon disulphide and nickel (II) acetate to form methyl isobutyl ketone (MIBK) extractable yellow nickel(II) dimethyl dithiocarbamate [Ni(DTC)2] complex showing λmax at 428 nm for this purpose. The molar absorptivity (ε) and Sandell’s sensitivity were found to be 3.35x103L/mol cm and 0.059µg/cm2 respectively. The leaching potential has been evaluated by Groundwater Ubiquity Score (GUS) and the values obtained in the range 2.88-3.07 classify as leacher pesticide thereby could endanger live of aquatic environment and consumers. Thus, necessitate it for judicious use to reduce contamination risk to ecosystem.
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