T. Perezruiz et al., SPECTROFLUOROMETRIC DETERMINATION OF PARAQUAT BY MANUAL AND FLOW-INJECTION METHODS, Analyst (London. 1877. Print), 123(7), 1998, pp. 1577-1581
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 fluore
scence intensity is linearly related to paraquat concentration from 0.
13 to 7.4 mu g ml(-1). The method can be easily adapted to a flow syst
em using a two-channel manifold, the peak height being proportional to
the paraquat concentration over the range 1.6-22.3 mu g ml(-1) Manual
and flow-injection procedures were satisfactorily applied to the dete
rmination of paraquat in commercial herbicides, waters, soils and pota
toes.