Chemiluminescent determination of the pesticide bromoxynil by on-line photodegradation in a flow-injection system.
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.
Pawlicová
Z
Z
Department of Analytical Chemistry, University of Valencia, Valencia, Spain.
Albert-García
J R
JR
Sahuquillo
I
I
García
Mateo J V
MJ
Catalá Icardo
M
M
Martínez Calatayud
J
J
D017022:Flow Injection Analysis / Q000295:instrumentation / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008163:Luminescent Measurements / Q000295:instrumentation* / Q000379:methods*; D015394:Molecular Structure; D009570:Nitriles / Q000032:analysis*; D010777:Photochemistry; D012680:Sensitivity and Specificity
D009570:Nitriles; C006826:bromoxynil