A study of sorption processes in chromato-desorption systems based on nanostructured polymer sorbent Polysorb-1
Abstract
The optimization of various methods for obtaining standard gas mixtures is required due to increased accuracy and speed when calibrating analytical instruments. In analytical practice, there are many methods for obtaining gas mixtures containing volatile organic compounds that meet existing standards for metrological support of gas analysis, in particular, the chromatography-desorption method.
The purpose of the study was investigation of the processes occurring in a chromatography-desorption system based on the nanostructured polymer sorbent Polysorb-1, in order to optimize the chromatography-desorption method for producing standard gas mixtures.
The object of the study was chromatography-desorption systems, metal tubes of various lengths filled with nanostructured polymer sorbent Polysorb-1. In this study, it was proposed to eliminate the chromatography-sorption stage to increase the speed of the process of obtaining SGM. Instead, a certain volume of a volatile component (hexane) in a liquid state with a volume of 10–500 μl was added to the initial section of the system using an automatic dispenser. After this, the CDS was connected to an air compressor.
The experimental study of the resulting CDS consisted of varying the gas flow rate passing through the system, the length of the CDS, and the amount of hexane placed in the system.
It has been established that a decrease in the flow rate of gas passing through the CDS led to an increase in the time of maintaining a quasi-constant concentration of the analyte in the gas phase, while the average concentration changed slightly. An increase in the amount of hexane introduced into the system led to an increase in the concentration of the analyte in the resulting mixture and an increase in the time of maintaining a constant concentration. However, when a certain amount of introduced hexane was reached (in the studied system it was 100 μl), the concentration of the volatile component in the resulting gas mixture did not change, and the time to maintain a constant concentration increased.
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References
Slominska M., Konieczka P., Na-miesnik J., Standard gas mixture indispen-sable reference materials in the analysis of gaseous media. Trends in Analytical Chem-istry, 2010;29: 419-429.
Aleksashina O.V., Problemy kontrol-ya vrednyh primesej v vozduhe proizvod-stvennyh pomeshchenij, Ecology of indus-trial production, 2015; 3: 41-44. (In Russ.)
Platonov I.A. Rodinkov O.V., Gorba-cheva A.R., Metody i sredstva prigotovleniya standartnyh gazovyh smesej, J. of Analytical Chemistry, 2018; 73(2): 84-99. (In Russ.)
Smygina I.N. Diss. cand. chem. nauk. Samara, 2007. 172 p. (In Russ.)
Berezkin V.G., Platonov I.A., Onuchak L.A., Dinamicheskij sposob polu-cheniya parogazovyh smesej s post-oyannymi koncentraciyami letuchih or-ganicheskih soedinenij s regeneriruemym potokom zhidkogo rastvora. Sorbtsionnye i khromatograficheskie protsessy, 2006; 6(4): 591-595. (In Russ.)
Sakodynsky K.I. Polimernye sorbenty dlja gazovoj hromatografii. M., Nauka, 1977, 168 p. (In Russ.)
GOST R ISO 6144-2008. Nacion-al'nyj standart rossijskoj federacii analiz gazov. Prigotovlenie graduirovochnyh gazovyh smesej. Staticheskij ob’emnyj metod. Gas analysis. Preparation of calibra-tion gas mixtures. Static volumetric meth-od. (In Russ.)
GOST R ISO 6144-2008. Nacion-al'nyj standart rossijskoj federacii. analiz gazov. Prigotovlenie graduirovochnyh gazovyh smesej. Staticheskij obemnyj metod. (In Russ.)
Moskvin L.N., Rodinkov O.V. Hro-matomembrannoe koncentrirovanie mikro-primesej organicheskih zagryaznitelej pri-rodnyh vod i atmosfernogo vozduh. J. of Analytical Chemistry. 2002; 57(10): 1057-1063.
Berezkin V.G., Arutyunov Yu.I., Platonov I.A. Patent RF, № 2324174, 2008. (In Russ.)
Berezkin V.G., Arutyunov Yu.I., Platonov I.A. Patent RF, № 2324473, 2008. (In Russ.)
Platonov I.A., Kolesnichenko I.N., Lange P.K. Chromatographic-Desorption Method for Preparing Calibration Gas Mix-tures of Volatile Organic Compounds. Measurement Techniques. 2017; 59(12): 1330-1333.
Berezkin V.G., Platonov I.A., Smygina I.N. Hromato-desorbcionnyj sposob polucheniya potoka gaza, soderzhashchego mikroprimesi letuchih soedinenij. Chemistry and chemical tech-nology. 2007; 50(8): 22-24.
Novikov V.F. Perikova E.S., Kara-taev O.R. Problemy ekologicheskoj be-zopasnosti vozdushnoj sredy promyshlen-nyh predpriyatij. Izvestija KazGASU. 2009; 2: 289-294. (In Russ.)
Vitenberg A.G., Ioffe B.V. Gazovaja jekstrakcija v hromatograficheskom an-alize. Parofaznyj analiz i rodstvennye metody, 1982, 280 p.
