A Sequential Spectrophotometric Method for the Determination of Paraquat and Diquat in Plasma
- 1 September 1993
- journal article
- bioanalytical methods
- Published by Taylor & Francis in Analytical Letters
- Vol. 26 (9) , 1891-1904
- https://doi.org/10.1080/00032719308017438
Abstract
A sequential spectrophotometric method for the simultaneous determination of paraquat and diquat in plasma using second-derivative spectroscopy after ion-pair liquid-liquid extraction was developed. The paraquat and diquat in the last extract are reduced with alkaline sodium dithionite to coloured complexes whose absorption peaks appear at a different wavelength. The two herbicides can thus be determined sequentially over the wavelength ranges 454.3—446.4 nm (diquat) and 460—396 nm (paraquat), respectively.Keywords
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