2-(?-Pyridyl)-thioquinaldinamide (PTQA)-A novel fluorimetric reagent in inorganic trace analysis. I: The nonextractive, nonquenching fluorescent method for the determination of chromium(VI)

Autor:	Mohamed J. U. Ahmed, Anil K. Chakrabarti, B. K. Pal
Rok vydání:	1989
Předmět:	chemistry.chemical_classification Aqueous solution Bicyclic molecule Fluorescence spectrometry Analytical chemistry chemistry.chemical_element Fluorescence Fluorescence spectroscopy Analytical Chemistry Chromium chemistry Reagent Thioamide Nuclear chemistry
Zdroj:	Mikrochimica Acta. 97:393-401
ISSN:	1436-5073 0026-3672
DOI:	10.1007/bf01242262
Popis:	A direct fluorimetric method for determining Cr(VI) in aqueous solutions is described. The nonfluorescent reagent 2-(α-pyridyl)-thioquinaldinamide (PTQA) and Cr(VI) interact to produce an intensely fluorescent species [λex(max) 360 nm; λem(max) 500 nm] showing constant and maximum fluorescence intensity in slightly acidic media (0.18N–1.08N H2SO4). The fluorescence attains its maximum value within 5 min and remains unchanged for 24 h. The system obeys Beer's law from 2 ng/ml to 0.8 μg/ml of Cr(VI). Over sixty cations, anions and complexing agents are without any effect on the fluorimetric determination of 0.1 μg/ml of Cr(VI). The method has been tested with synthetic mixtures, steels, solutions containing both Cr(III) and Cr(VI), and environmental samples.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cd8c4374b67eda2d9f1c321ff67f328f https://doi.org/10.1007/bf01242262 Zobrazit plný text záznamu Full text from SpringerLink