title: Spectrophotometric method for the determination of paraquat in water, grain and plant materials.
abstract: A sensitive spectrophotometric method for the determination of paraquat using ascorbic acid (an easily available reducing agent) is described. Paraquat is reduced with ascorbic acid in alkaline solution to give a blue radical ion with an absorbance maximum at 600 nm. Beer's law is obeyed in the range 12-96 micrograms of paraquat in 10 ml of the final solution (1.2-9.6 ppm). The important analytical parameters and the optimum reaction conditions were evaluated. The method was applied successfully to the determination of paraquat in water, grain and plant materials.
authors.affiliation: Department of Chemistry, Ravishankar University, Raipur, India.
authors.forename: P
authors.initials: P
authors.lastname: Shivhare
authors.forename: V K
authors.initials: VK
authors.lastname: Gupta
mesh_terms: D001205:Ascorbic Acid; D002523:Edible Grain / Q000032:analysis*; D010269:Paraquat / Q000032:analysis*; D010944:Plants / Q000032:analysis*; D006109:Poaceae / Q000032:analysis; D011198:Solanum tuberosum / Q000032:analysis; D013053:Spectrophotometry / Q000379:methods*; D014867:Water / Q000032:analysis*
chemical_list: D014867:Water; D010269:Paraquat; D001205:Ascorbic Acid