Chemical modification by ascorbic acid and oxalic acid in graphite furnace atomic absorption spectrometry

Autor:	Peter C. Bertels, Marc M. Lamoureux, John P. Byrne, Chuni L. Chakrabarti, Glen F. R. Gilchrist
Rok vydání:	1993
Předmět:	Hydrogen Chemistry Oxalic acid Inorganic chemistry chemistry.chemical_element Ascorbic acid Analytical Chemistry law.invention chemistry.chemical_compound law Graphite Graphite furnace atomic absorption Atomic absorption spectroscopy Pyrolysis Carbon monoxide
Zdroj:	Analytical Chemistry. 65:1267-1272
ISSN:	1520-6882 0003-2700
DOI:	10.1021/ac00057a025
Popis:	The effects of addition of ascorbic and oxalic acids on the atomic absorption signal for lead are explained by a gas-phase thermodynamic equilibrium model. The gas-phase composition of the graphite furnace was determined as samples containing ascorbic or oxalic acid were pyrolyzed. Hydrogen and carbon monoxide were identified as two of the major pyrolysis products. The amounts of these reducing gases, formed in the atomization cycle, varied with the modifier used, the charring temperature employed, and the condition of the surface of the pyrolytically coated graphite tube. The extent of the shift in the appearance temperature showed correlation with variations in concentrations of hydrogen and carbon monoxide produced by pyrolysis
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b23ce7c7b99137ba7a6fc1f7746b793 https://doi.org/10.1021/ac00057a025 Zobrazit plný text záznamu