Spectrofluorimetric determination of paraquat by manual and flow injection methods.
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.
Pérez-Ruíz
T
T
Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, Spain.
Martínez-Lozano
C
C
Tomás
V
V
Fenoll
J
J
D001547:Benzaldehydes; D017022:Flow Injection Analysis; D005470:Fluorometry; D005506:Food Contamination / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D006801:Humans; D010269:Paraquat / Q000032:analysis*; D012680:Sensitivity and Specificity; D012989:Soil Pollutants / Q000032:analysis*; D011198:Solanum tuberosum
D001547:Benzaldehydes; D006540:Herbicides; D012989:Soil Pollutants; D010269:Paraquat