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  • Chemiluminescence determination of carbofuran and promecarb by flow injection analysis using two photochemical reactions.

Chemiluminescence determination of carbofuran and promecarb by flow injection analysis using two photochemical reactions.

The Analyst (2002-12-12)
Tomas Pérez-Ruiz, Carmen Martínez-Lozano, Virginia Tomás, Jesús Martín
ABSTRACT

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.