Search results for "Iodometry"

showing 3 items of 3 documents

Comparison of several methods used for the determination of cephalosporins. Analysis of cephalexin in pharmaceutical samples

2002

The precision of UV absorbance of intact and acid degraded cephalosporins, ninhydrin, high performance liquid chromatography and iodometric methods used for analysis of cefoxitin, cefotaxime, cephazolin and cephalexin were compared. To obtain the calibration graphs the analytical signal used were: absorbance, first derivative absorbance, second derivative absorbance and H-point Standard Additions Method by using absorbance values at two selected wavelengths as analytical signal. These methods and calibration graphs were also used for the determination of cephalexin in pharmaceutical samples.

Clinical BiochemistryPharmaceutical ScienceCapsulesHigh-performance liquid chromatographyAnalytical ChemistryAbsorbancechemistry.chemical_compoundIodometrySpectrophotometryDrug Discoverypolycyclic compoundsmedicineChromatography High Pressure LiquidSpectroscopyAntibacterial agentSecond derivativeCephalexinChromatographymedicine.diagnostic_testChemistrydigestive oral and skin physiologyTitrimetryNinhydrinCephalosporinsSolutionsStandard additionNinhydrinIndicators and ReagentsSpectrophotometry UltravioletJournal of Pharmaceutical and Biomedical Analysis
researchProduct

A clean method for flow injection spectrophotometric determination of cyclamate in table sweeteners

2005

Abstract A flow system based on the multicommutation is proposed for fast and clean determination of cyclamate. The procedure exploits the reaction of cyclamate with nitrite in acidic medium and the spectrophotometric determination of the excess of nitrite by iodometry. The flow system was designed with a set of solenoid micro-pumps to minimize reagent consumption and waste generation. The detection limit was estimated as 30 μmol L −1 (99.7% confidence level) with linear response ranging up to 3.0 mmol L −1 . The coefficient of variation was estimated as 1.7% for a solution containing 2.0 mmol L −1 cyclamate ( n  = 20). About 60 samples can be analyzed per hour, consuming only 3 mg KI and 1…

Detection limitChromatographymedicine.diagnostic_testChemistryCoefficient of variationBiochemistryAnalytical ChemistryWaste generationchemistry.chemical_compoundIodometrySpectrophotometryReagentmedicineEnvironmental ChemistryNitriteEffluentSpectroscopyAnalytica Chimica Acta
researchProduct

Über eine neue Methode zum Nachweis des als Primärprodukt der Autoxydation der Metalle Eisen, Nickel und Kobalt in Säure- und Salzlösungen gebildeten…

1971

H2O2 als Zwischenprodukt der Autoxydation (bzw. · OOH oder · OH) kann mit Hilfe der Phosphin-, Phosphinoxid- Methode bei Fe, Ni und Co wirksamer als mit Hilfe der Jodometrie erfast werden. In saurem Medium sind Tris-(m-aminophenyl)-phosphin (1), im alkalischen Bereich Tris-(p-carboxyphenyl)- phosphin (2) wirksame auch fur quantitative Bestimmungen geeignete Reagentien auf H2O2 · 1 und 2 reagieren bei hoheren Konzentrationen bis zu 20 ma1 schneller mit H2O2 als dieses mit der Eisengrenzflache. Ni und Co erzeugen mehr H2O2 als Fe. Bei Eisen entsteht im neutralen Medium mehr H2O2 als im sauren Bereich. Die unterschiedlichen Anfangsgeschwindigkeiten des Sauerstoffverbrauchs in sauerstoffhaltige…

Reaction mechanismAutoxidationMechanical EngineeringMetals and Alloyschemistry.chemical_elementSulfuric acidGeneral MedicineSurfaces Coatings and Filmschemistry.chemical_compoundNickelIodometrychemistryMechanics of MaterialsReagentMaterials ChemistryEnvironmental ChemistryHydrogen peroxideCobaltNuclear chemistryMaterials and Corrosion
researchProduct