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RESEARCH PRODUCT
Spectrophotometric determination of ethiofencarb in waters by reaction with p-aminophenol
Karim D. KhalafM. De La GuardiaJ. Sancenónsubject
AbsorbanceDetection limitHydrolysischemistry.chemical_compoundChemistryP-AminophenolEthiofencarbAnalytical chemistryPhenolAlkaline hydrolysis (body disposal)BiochemistryChemical reactionNuclear chemistrydescription
An automatized procedure has been developed for the spectrophotometric determination of ethiofencarb in water by reaction with p-aminophenol after alkaline hydrolysis to obtain the corresponding phenol sulphone. The hydrolyzed samples are continuously introduced into different manifolds at the same time as 300 mg/l p-aminophenol, 0.004 mol/l KIO4 and 0.04 mol/l NaOH solutions. The absorbance is measured at 638 nm after a reaction time of 6 min in stop flow. This absorbance band corresponds to the indo dye obtained from the reaction between the phenol sulphone of ethiofencarb and the quinoneimine form of the p-aminophenol and it permits a matrix-free spectrophotometric determination of ethiofencarb with a limit of detection of 33 μg/l. The recovery of ethiofencarb in different water matrices varies from 71 to 126%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-01-01 | Fresenius' Journal of Analytical Chemistry |