title: An improved back-flush-to-vent gas chromatographic method for determination of trace permanent gases and carbon dioxide in ultra-high purity ammonia.
abstract: A novel method for rapid, quantitative determination of trace permanent gases and carbon dioxide in ultra-high purity ammonia by dual-channel two-dimensional GC-PDHID is presented. An improved matrix back-flush-to-vent approach combining back-flush column switching technique with auxiliary NaHSO4 ammonia trap is described. The NaHSO4 trap prevents traces of ammonia from entering the analytical column and is shown not to affect the impurity content of the sample. The approach allows shortening the analysis time and increasing the amount of measurements without extensive maintenance of the GC-system. The performance of the configuration has been evaluated utilizing ammonia- and helium-based calibration standards. The method has been applied for the analysis of 99.9999+% ammonia purified by high-pressure distillation at the production site.
authors.affiliation: Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., 603950 Nizhny Novgorod, Russia. Electronic address: m.trubyanov@gmail.com.
authors.forename: Maxim M
authors.initials: MM
authors.lastname: Trubyanov
authors.affiliation: Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., 603950 Nizhny Novgorod, Russia.
authors.forename: Georgy M
authors.initials: GM
authors.lastname: Mochalov
authors.affiliation: Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., 603950 Nizhny Novgorod, Russia.
authors.forename: Ilya V
authors.initials: IV
authors.lastname: Vorotyntsev
authors.affiliation: Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., 603950 Nizhny Novgorod, Russia.
authors.forename: Andrey V
authors.initials: AV
authors.lastname: Vorotyntsev
authors.affiliation: Firm HORST Ltd., 14-2-257 Akademika Yangelya str., 117534 Moscow, Russia.
authors.forename: Sergey S
authors.initials: SS
authors.lastname: Suvorov
authors.affiliation: Firm HORST Ltd., 14-2-257 Akademika Yangelya str., 117534 Moscow, Russia.
authors.forename: Konstantin Y
authors.initials: KY
authors.lastname: Smirnov
authors.affiliation: Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., 603950 Nizhny Novgorod, Russia.
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Vorotyntsev
mesh_terms: D000641:Ammonia / Q000032:analysis*; D002138:Calibration; D002245:Carbon Dioxide / Q000032:analysis; D002849:Chromatography, Gas / Q000379:methods / Q000592:standards; D006371:Helium
chemical_list: D002245:Carbon Dioxide; D006371:Helium; D000641:Ammonia
keywords: Ammonia; Back-flush technique; GC-PDHID; Sodium hydrogen sulfate; Trace impurities