caa a22 4500 463220382 CHVBK 20180405153210.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1134/S1061934807050103 doi (NATIONALLICENCE)springer-10.1134/S1061934807050103 Determination of phthalic, terephthalic, and isophthalic acids in the presence of each other by gas chromatography [Elektronische Daten] [V. Lipik, N. Cherkes, V. Martsul'] 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. Pleiades Publishing, Ltd., 2007 Lipik V. LEMP/MAO CC021, Universite Montpellier 2, S.T.L., Place Eugene Bataillon, 34095, Montpellier, France aut Cherkes N. Belarussian State Technological University, ul. Sverdlova 13a, 220050, Minsk, Belarus aut Martsul' V. Belarussian State Technological University, ul. Sverdlova 13a, 220050, Minsk, Belarus aut Journal of Analytical Chemistry Nauka/Interperiodica 62/5(2007-05-01), 454-457 1061-9348 62:5<454 2007 62 10809 https://doi.org/10.1134/S1061934807050103 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807050103 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lipik V. LEMP/MAO CC021, Universite Montpellier 2, S.T.L., Place Eugene Bataillon, 34095, Montpellier, France aut NATIONALLICENCE 700 1- Cherkes N. Belarussian State Technological University, ul. Sverdlova 13a, 220050, Minsk, Belarus aut NATIONALLICENCE 700 1- Martsul' V. Belarussian State Technological University, ul. Sverdlova 13a, 220050, Minsk, Belarus aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/5(2007-05-01), 454-457 1061-9348 62:5<454 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer