title: Photo-induced chemiluminometric determination of Karbutilate in a continuous-flow multicommutation assembly.
abstract: The present paper deals with the chemiluminescent determination of the herbicide Karbutilate on the basis of its previous photodegradation by using a low-pressure Hg lamp as UV source in a continuous-flow multicommutation assembly (a solenoid valves set). The pesticide solution was segmented by a solenoid valve and sequentially alternated with segments of the 0.001 mol l(-1) of NaOH solution, the suitable media for the formation of photo-fragments; then it passes through the photo-reactor and was lead to the flow-cell after being divided in small segments which were sequentially alternated with the oxidizing system; 2 x 10(-5) mol l(-1) of potassium permanganate in 0.2% pyrophosphoric acid. The studied calibration range, from 0.1 microg l(-1) to 65 mg l(-1), resulted in a linear behaviour over the range 20 microg l(-1)-20 mg l(-1) and fitting the linear equation: I=(1180+/-30)C+(15+/-5) with the correlation coefficient 0.9998. The limit of detection was 10 microg l(-1) and the sample throughput 17 h(-1). After testing the influence of a large series of potential interfering species, the method was applied to water and human urine samples.
authors.affiliation: Department of Analytical Chemistry, University of Valencia, Valencia, Spain.
authors.forename: C M P G
authors.initials: CM
authors.lastname: Amorim
authors.forename: J R
authors.initials: JR
authors.lastname: Albert-García
authors.forename: M C B S
authors.initials: MC
authors.lastname: Montenegro
authors.forename: A N
authors.initials: AN
authors.lastname: Araújo
authors.forename: J Martínez
authors.initials: JM
authors.lastname: Calatayud
mesh_terms: D002138:Calibration; D002219:Carbamates / Q000032:analysis* / Q000528:radiation effects / Q000652:urine; D011756:Diphosphates / Q000737:chemistry; D005260:Female; D017022:Flow Injection Analysis / Q000295:instrumentation* / Q000592:standards; D006540:Herbicides / Q000032:analysis* / Q000528:radiation effects / Q000652:urine; D006801:Humans; D008163:Luminescent Measurements / Q000379:methods* / Q000592:standards; D008297:Male; D015394:Molecular Structure; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D010782:Photolysis; D011196:Potassium Permanganate / Q000737:chemistry; D015203:Reproducibility of Results; D012972:Sodium Hydroxide / Q000737:chemistry; D013696:Temperature; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry
chemical_list: D002219:Carbamates; D011756:Diphosphates; D006540:Herbicides; D016877:Oxidants; D011196:Potassium Permanganate; D014867:Water; C019276:BPMC; C014631:karbutilate; C107241:diphosphoric acid; D012972:Sodium Hydroxide; C065256:isoprocarb