Chemiluminescent determination of the pesticide bromoxynil by on-line photodegradation in a flow-injection assembly

[EN] A new, robust and simple method is proposed for the chemiluminescent determination of the pesticide Bromoxynil. The empirical procedure is performed with the aid of a flow-injection manifold provided with an on-line photo-reactor to obtain chemiluminescent photofragments. After a period of 12 s of irradiation with an 8 W low-pressure mercury lamp, a chemiluminescent oxidation was performed with the system potassium permanganate in a polyphosphoric acid medium. The photolysis required a basic medium (KOH 0.014 mol l(-1)) with ethanol (1%) as a sensitizer. The method allowed the determination of 134 samples h(-1) of Bromoxynil in a wide interval of concentrations, over the range 5 x 10(-3) - 1 mg l(-1); the detection limit was 5 x 10(-3) mg l(-1). The RSD (n = 24) at 0.25 mg l(-1) of the pesticide level was 2.3%. The method was applied to a water sample and to a formulation.This research was supported by Ministerio de Educación y Ciencia (Spanish Government), Project BQU2002-04248-C02-01.Pawlicova, Z.; Albert-Garcia, JR.; Sahuquillo, I.; García Mateo, JV.; Catalá-Icardo, M.; Martínez Calatayud, J. (2006). Chemiluminescent determination of the pesticide bromoxynil by on-line photodegradation in a flow-injection assembly. Analytical Sciences. 22(1):29-34. doi:10.2116/analsci.22.29S293422