Spectrophotometric determination of diquat and paraquat in aqueous herbicide formulations

摘要: Methods are described for determining diquat and paraquat, singly in admixture, formulations. For diquat, ultraviolet absorptiometry at 310 mµ a sodium acetate buffer solution pH 4·05 is adopted. Paraquat determined diluted by measuring the optical density, 600 mµ, of blue free radical produced reduction with alkaline dithionite. analysing mixtures containing both these methods combined use made base-line correction procedure to compensate interference determination paraquat. The error established be within ±2 per cent.