6533b836fe1ef96bd12a1bb0
RESEARCH PRODUCT
A clean analytical method for the spectrophotometric determination of formetanate incorporating an on-line microwave assisted hydrolysis step
M. De La GuardiaÁNgel Morales-rubioM.j. Escuriolasubject
ChromatographyMicrowave ovenAlkaline hydrolysis (body disposal)BiochemistryAnalytical ChemistryHydrolysischemistry.chemical_compoundchemistryTap waterFormetanateSlurryEnvironmental ChemistryIndophenolSpectroscopyMicrowavedescription
Abstract A fast and completely automated procedure is proposed for the spectrophotometric determination of formetanate in waters by means of its reaction with p-aminophenol (PAP). The method involves the on-line alkaline hydrolysis of formetanate to m-aminophenol (MAP) and its reaction, in the presence of KIO 4 as oxidant agent, with the quinoneimine form of PAP, to form a blue indophenol dye which absorbs at 576 nm. The on-line hydrolysis can be carried out in a 6 m reaction coil located inside the cavity of a domestic microwave oven operated at 650 W, or in a 4 m reaction coil located inside the cavity of a Microdigest 301 microwave system operated at 60 W and allows us, in both cases, a complete hydrolysis of formetanate thus improving the complete automation of the analytical procedure. After the measurement step, the analytical waste is merged with a TiO 2 slurry and then detoxified by on-line UV-irradiation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-05-01 | Analytica Chimica Acta |