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Spectrofluorimetric determination of paraquat by manual and flow injection methods
T Pérez-Ruíz1, C Martínez-Lozano, V Tomás
1Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, Spain.
Abstract:
The reaction involving the formation of a fluorescent charge-transfer complex between paraquat and benzaldehyde was studied in ethanol-water medium. In the presence of a large excess of benzaldehyde, the fluorescence intensity is linearly related to paraquat concentration from 0.13 to 7.4 micrograms ml-1. The method can be easily adapted to a flow system using a two-channel manifold, the peak height being proportional to the paraquat concentration over the range 1.6-22.3 micrograms ml-1. Manual and flow-injection procedures were satisfactorily applied to the determination of paraquat in commercial herbicides, waters, soils and potatoes.