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A specific method is described for determining paraquat (1,l'-dimethyl-4,4'-bipyridylium cation) in fruits with a sensitivity of 0.01 p.p.m. It depends on measurement of the light absorption of reduced solutions of paraquat after they have been concentrated and purified -by cation-exchange chromatography. Correction for extraneous background absorption from naturally occurring plant substances is made by using a "base-line" method of calculation. The method has been used with minor modifications for determining paraquat in a wide variety of other food crops and in water.PARAQUAT is the common name for the l,l'-dimethyl-4,4'-bipyridylium cation, which is manufactured in the form of its dichloride (I) or di-(methyl sulphate) salt, and is the active ingredient of the commercial formulation, Gramoxone.

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