Determination of phthalic, terephthalic, and isophthalic acids in the presence of each other by gas chromatography

Autor:	N. S. Cherkes, V. T. Lipik, V. N. Martsul
Rok vydání:	2007
Předmět:	Chromatography Sulfuric acid Isoamyl alcohol Analytical Chemistry law.invention Phthalic acid chemistry.chemical_compound chemistry law Azeotrope Sample preparation Gas chromatography Distillation Triethylamine
Zdroj:	Journal of Analytical Chemistry. 62:454-457
ISSN:	1608-3199 1061-9348
Popis:	A procedure was developed for the simultaneous determination of phthalic acid isomers; the procedure includes the preparation of diisoamyl esters by reaction with isoamyl alcohol in a benzene solution in the presence of sulfuric acid with the distillation of an azeotrope mixture of benzene with water, the neutralization of acid with triethylamine, and the separation of esters by gas-liquid chromatography on a steel column (1 m × 3 mm) filled with Chromaton N-AW-HMDS with 5% Apiezon L in the temperature programming mode with flame-ionization detection. The time of separation is 13 min. The time of the sample preparation step is 2–2.5 h. The lower determination limit is 20 ng. The procedure allows the determination of phthalic acids in the concentration range from 0.02 to 2 mg/L in liquid samples and from 0.03 to 3 mg/m3 in air.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::87fe348ae9ad4aa5a490d08ac58e6770 https://doi.org/10.1134/s1061934807050103 Zobrazit plný text záznamu Plný text ve formátu PDF