diplomsko delo
Kaja Ručigaj (Author), Irena Kralj Cigić (Mentor)

Abstract

Različne lastnosti PVC-ja je možno doseči z dodajanjem termičnih stabilizatorjev, mehčal, antioksidantov, polnil in drugih dodatkov. PVC ima s temi dodatki boljše mehanske in toplotne lastnosti. V diplomskem delu sem določevala antioksidante v 44 različnih vzorcih PVC. Metoda in kromatografski pogoji so bili že optimizirani. Uporabila sem reverznofazno kolono C18 z gradientno elucijo dveh mobilnih faz – acetonitrila in MQ vode, volumen injiciranja je znašal 30 μL, pretok pa sem ohranjala konstanten pri 0,5 mL/min. Na UV detektorju je bila nastavljena valovna dolžina 210 nm. Injicirala sem različne koncentracije standardnih raztopin dveh antioksidantov Irganox 1076 in Irgafos 168 in integrirala ploščine posameznih vrhov na kromatogramih. Izrisala sem umeritveno premico za vsak antioksidant – graf ploščine kromatografskega vrha izbranega antioksidanta v odvisnostni od masne koncentracije tega antioksidanta v mešani standardni raztopini. Na osnovi tega sem določila mejo zaznave in mejo določitve. Nato sem pripravila vzorce za analizo in jih injicirala v HPLC. Na podlagi kromatografskih vrhov sem vzorce razdelila v 6 skupin. Ugotovila sem, da vzorci poleg antioksidantov Irganox 1076 in Irgafos 168 vsebujejo še ostale spojine, ki so lahko mehčala, drugi antioksidanti ali drugi dodatki.

Keywords

polivinilklorid;PVC;identifikacija;HPLC;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [K. Ručigaj]
UDC: 543.544.5HPLC:678.743.2.048(043.2)
COBISS: 125624323 Link will open in a new window
Views: 36
Downloads: 15
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Other data

Secondary language: English
Secondary title: Determination of antioxidants in PVC
Secondary abstract: Various forms of PVC can be achieved by adding thermal stabilizers, plasticizers, antioxidants, fillers and other additives. Additives in PVC enhances its mechanical and thermal properties. In my work, I determined antioxidants in 44 different PVC samples. The method and chromatographic conditions were already optimized. I used C18 reverse phase column and for gradient-elution two mobile phases: acetonitrile and MQ water, the injection volume was 30 μL and flow rate constant at 0.5 mL/min. A wavelength of 210 nm was set on the UV detector. At the beginning, I injected different concentrations of the mixed standard solution of antioxidants and integrated the peak areas in the obtained chromatograms. I plotted a calibration line for each antioxidant - a graph of the peak area of the chromatographic peak of the selected antioxidant as a function of the mass concentration of this antioxidant in the mixed standard solution. Based on obtained results limit of detection and limit of quantification were determined. Then, I prepared the samples for analysis and injected them into the HPLC. Based on the chromatographic peaks, I divided the samples into 6 groups, according to the peaks at the same retention times. I found that, in addition to the antioxidants Irganox 1076 and Irgafos 168, the samples also contain other compounds that could be softened by other antioxidants or other additives.
Secondary keywords: antioxidants;HPLC;polyvinyl chloride;identification;Antioksidanti;Tekočinska kromatografija;Univerzitetna in visokošolska dela;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000374
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, VSŠ Kemijska tehnologija
Pages: 28 str.
ID: 16354537