caa a22 4500 467886326 CHVBK 20180406152735.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s10924-006-0024-5 doi (NATIONALLICENCE)springer-10.1007/s10924-006-0024-5 Assessing Aerobic Biodegradability of Plastics in Aqueous Environment by GC-Analyzing Composition of Equilibrium Gaseous Phase [Elektronische Daten] [Pavel Dřímal, Josef Hrnčiřík, Jaromír Hoffmann] Testing biodegradability of plastics under varied conditions of the environment as well as under laboratory conditions in accordance with valid international standards is very laborious, lengthy and often also economically demanding. For this reason, applicability was verified of gas chromatography to analyze gaseous phase when investigating the biodegradation course of plastics in an aqueous environment as an alternative to customary employed methods. A mathematical model of acid-basic CO2 equilibrium in a gas-liquid system was worked out, enabling to determine quantity of produced CO2 through chromatographic analysis of gaseous phase, in dependence on ratio of liquid and gas phase volumes (V l/V g) and on actual pH of liquid phase. Experimental conditions for organizing the tests were optimized. A ratio that proved suitable was V l/V g≅0.1at pH≈7.1 of liquid phase. Under these test conditions, biodegradability of model samples, PHB, Gellan gum and Xanthan gum, was explored; course of biodegradation was studied through produced CO2 (values $$D_{\rm {CO}_2}$$ ) determined by analyzing gaseous phase through gas chromatography on the one hand, and through customary "titration” procedure on the other. With water-soluble polymers, the decrement in dissolved organic carbon (values D DOC) was also studied. Difference between values does not exceed 5%. The procedures in question are alternative "substituting” procedures for observing course of aerobic biodegradation of substances in an aqueous environment. Springer Science+Business Media, Inc., 2006 Gas chromatography nationallicence Aerobic biodegradation nationallicence Carbon dioxide balance nationallicence Plastics nationallicence Dřímal Pavel Faculty of Technology, Department of Environmental Protection Engineering, Tomas Bata University, T. G. Masaryka 275, 762 72, Zlín, Czech Republic aut Hrnčiřík Josef Faculty of Technology, Department of Food Engineering and Chemistry, Tomas Bata University, T.G.Masaryka 275, 762 72, Zlín, Czech Republic aut Hoffmann Jaromír Faculty of Technology, Department of Environmental Protection Engineering, Tomas Bata University, T. G. Masaryka 275, 762 72, Zlín, Czech Republic aut Journal of Polymers and the Environment Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 14/3(2006-07-01), 309-316 1566-2543 14:3<309 2006 14 10924 https://doi.org/10.1007/s10924-006-0024-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10924-006-0024-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dřímal Pavel Faculty of Technology, Department of Environmental Protection Engineering, Tomas Bata University, T. G. Masaryka 275, 762 72, Zlín, Czech Republic aut NATIONALLICENCE 700 1- Hrnčiřík Josef Faculty of Technology, Department of Food Engineering and Chemistry, Tomas Bata University, T.G.Masaryka 275, 762 72, Zlín, Czech Republic aut NATIONALLICENCE 700 1- Hoffmann Jaromír Faculty of Technology, Department of Environmental Protection Engineering, Tomas Bata University, T. G. Masaryka 275, 762 72, Zlín, Czech Republic aut NATIONALLICENCE 773 0- Journal of Polymers and the Environment Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 14/3(2006-07-01), 309-316 1566-2543 14:3<309 2006 14 10924 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer