Chemiluminescence determination of carbofuran and promecarb by flow injection analysis using two photochemical reactions.
A flow injection-chemiluminescent method for the determination of carbofuran and promecarb is proposed. The assay was based on the on-line conversion of the pesticides into methylamine by irradiation with UV light. The methylamine generated was subsequently reacted with tris(2,2'-bipyridine)ruthenium(III), which was generated through the on-line photo-oxidation of tris(2,2'-bipyridine)ruthenium(II) with peroxydisulfate. The emitted light showed a linear relationship with the concentration of the pesticide over the ranges 0.22-11.2 microg ml(-1) for carbofuran and 0.41-16.6 microg ml(-1) for promecarb. The repeatability was 1.6% expressed as relative standard deviation (n = 10) and the reproducibility, studied on five different days, was 2%. The sample throughput was 200 injections per h. The reliability of the method for routine analysis of these pesticides in water, soil and grains is demonstrated.
Pérez-Ruiz
Tomas
T
Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, Spain. tpr@um.es
Martínez-Lozano
Carmen
C
Tomás
Virginia
V
Martín
Jesús
J
D002219:Carbamates / Q000032:analysis*; D002235:Carbofuran / Q000032:analysis*; D017022:Flow Injection Analysis; D005506:Food Contamination / Q000032:analysis*; D008163:Luminescent Measurements; D010573:Pesticide Residues / Q000032:analysis*; D010777:Photochemistry / Q000379:methods
D002219:Carbamates; D010573:Pesticide Residues; C009051:promecarb; D002235:Carbofuran