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Wyświetlanie 1-15 z 235
Tytuł:
A study on optimization of sample preparation for gas chromatographic methods used in routine irradiated foodstuffs detection
Autorzy:
Virgolici, M.
Medvedovici, A. V.
Manea, M. M.
Cutrubinis, M.
Moise, I. V.
Georgescu, R.
Powiązania:
https://bibliotekanauki.pl/articles/148092.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
irradiated foodstuffs detection
gas chromatography
Opis:
The study is focused on the optimization and minimization of sample preparation procedures given in EN 1784 and EN 1785 standardized methods for the detection of irradiated foodstuffs which contain fats. The techniques used in this study were gas chromatography (GC) with a flame ionization detector (FID) for hydrocarbons (HC) detection and GC coupled with mass spectrometry (MS) for 2-alkylcyclobutanones detection. Our work revealed that alternative extraction and clean-up procedures as well as alternative injection modes like large volume injection can significantly reduce the total analysis time and costs with comparable results.
Źródło:
Nukleonika; 2009, 54, 2; 115-121
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of pyrolysis process in processing of mixed food wastes
Autorzy:
Grycová, B.
Koutník, I.
Pryszcz, A.
Kaloč, M.
Powiązania:
https://bibliotekanauki.pl/articles/778553.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
pyrolysis
gas chromatography
food waste
Opis:
The food industry produces large amounts of solid and also liquid wastes. Different waste materials and their mixtures were pyrolysed in the laboratory pyrolysis unit to a final temperature of 800°C with a 10 minute delay at the final temperature. After the pyrolysis process of the selected wastes a mass balance of the resulting products, off-line analysis of the pyrolysis gas and evaluation of solid and liquid products were carried out. The highest concentration of methane, hydrogen and carbon monoxide were analyzed during the 4th gas sampling at a temperature of approx. 720–780°C. The concentration of hydrogen was measured in the range from 22 to 40 vol.%. The resulting iodine numbers of samples CHFO, DS, DSFW reach values that indicate the possibility of using them to produce the so-called “disposable sorbents” in wastewater treatment. The WC condensate can be directed to further processing and upgrading for energy use.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 1; 19-23
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dozowanie próbek gazów do kolumny chromatograficznej o podwyższonym ciśnieniu
Injection of gas samples to the high-pressure chromatography column
Autorzy:
Czech, K.
Słomkiewicz, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/270412.pdf
Data publikacji:
2011
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
kolumny chromatograficzne
chromatografia gazowa
gas chromatography
chromatography column
Opis:
Opracowano metodę dozowania próbek gazowych do kolumn chromatograficznych o podwyższonym ciśnieniu za pomocą strzykawki i zbudowano urządzenie służące do tego celu. Wykonano badania określające przydatność skonstruowanego urządzenia w porównaniu do tradycyjnej strzykawki do próbek gazowych.
The method of gas sampling by syringe to high pressure chromatography column was elaborated and the apparatus used to this aim was built. The usefulness investigations for comparison constructed device to traditional syringe to gas samples were made.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2011, 16, 2; 29-33
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pilot study on feasibility of application of gas chromatography for the assessment of acrylamide concentration in sewage sludge
Autorzy:
Włodarczyk, Elżbieta
Próba, Marta
Wolny, Lidia
Wojtal, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1039275.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
acrylamide
polyelectrolyte
sewage sludge
gas chromatography
Opis:
The aim of this study was to determine the possibility of using gas chromatography to measurement of the acrylamide concentration in sewage sludge. Acrylamide, as a toxic substance, is not indifferent to human health, but it is used in the production of plastics, dyes, adhesives, cosmetics, mortar, as well as a coagulant for water treatment, wastewater or sewage sludge conditioning. Determination of acrylamide by gas chromatography was based on standard: EPA Method 8032A "Acrylamid by gas chromatography." It consists of a bromination reaction of the compound in the presence of dibromopropendial derivative, a triple extraction with the ethyl acetate, a concentration of the eluate sample up to the 1 ml volume, and an analysis by the gas chromatography using an electron capture detector (ECD). The acrylamide concentration of was calculated according to the formula presented in the mentioned standard. All samples were performed twice (the difference between the results was not greater than 10%), and the average value of the four samples was 17.64 µg/L−1. The presence of acrylamide in sewage sludge has been confirmed.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 201-203
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Headspace Solid Phase Microextraction Procedure for Trace Analysis of Toluene
Autorzy:
Heidari, H. R.
Shahtaheri, S. J.
Golbabaei, F.
Alimohammadi, M.
Rahimi-Froushani, A.
Powiązania:
https://bibliotekanauki.pl/articles/90998.pdf
Data publikacji:
2008
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
headspace
solid phase microextraction
gas chromatography
toluene
Opis:
This study describes optimization of headspace solid phase microextraction followed by gas chromatography equipped with a flame ionization detector for toluene at trace level in spiked urine. The parameters affecting the extraction and gas chromatographic determination of analytes were studied: extraction time and temperature; desorption time and temperature; addition of NaCl; and pH, volume and agitation of the sample. Optimized headspace extraction was carried out at 30 °C for 6 min in the presence of 0.2 g⋅m–1of NaCl in the sample solution. Also, sample volume and sample pH were optimized at 5 ml and 7 (neutral pH), respectively. Desorption of the analytes was carried out at 250 °C for 60 s. The optimized procedure was validated with 3 different pools of spiked urine; it showed good reproducibility over 6 consecutive days and 6 within-day experiments. The study also determined the accuracy, linearity and detection limits of this method.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2008, 14, 4; 395-405
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review on physicochemical measurements by headspace gas chromatography. Studies of vapour-liquid equilibria.
Autorzy:
Lewandowski, Andrzej
Szymczyk, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/764138.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
headspace gas chromatography, vapour-liquid equilibrium, vapour pressure
Opis:
Headspace gas chromatography (HS-GC) is a powerful technique for the analysis of volatile compounds. It has found broad applications for quantitative and qualitative analyses of various samples as well as for physicochemical measurements. This paper briefly reviews the basic physicochemical applications of HS-GC including vapour pressure measurements and studies of vapour-liquid equilibria in multicomponent systems. A special attention is paid to methodological aspects of these measurements. The advantages and limitations of HS-GC in this field as well as typical applications are also pointed out.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2017, 72, 2
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-dimensional gas chromatography – principles and application in fruits analysis
Autorzy:
Lubinska, Martyna
Namieśnik, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1179569.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
aparature
applications
history
principles
two-dimensional gas chromatography
Opis:
Two-dimensional gas chromatography is a rapidly developing analytical technique. One of the major uses of this technique is its use for food analysis. The paper presents the principle of operation and history of this analytical technique. The specification of the two-dimensional gas chromatography technique has been discussed. The principles of separation of ingredients and application of the method, particularly in the analysis of food products, have also been described. A literature review was also done, presenting the use of two-dimensional gas chromatography for the analysis of fruit and fruit products.
Źródło:
World Scientific News; 2017, 75; 89-95
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and characterisation of bacteria degrading polycyclic aromatic hydrocarbons : phenanthrene and anthracene
Autorzy:
Nzila, A.
Sankaran, S.
Al-Momani, M.
Musa, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/204726.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phenanthrene
biodegradation
anthracene
gas chromatography
polycyclic aromatic hydrocarbons
Opis:
The aim was to isolate and characterise bacteria that can be used to degrade phenanthrene and anthracene. Bacteria were isolated by enrichment of contaminated soil in mineral medium. Growth profiles were assessed by colony forming units (CFU). Electron microscopy and 16S rRNA gene sequencing were employed to characterise these bacteria. Growth profiles were quantified by analysing the culture doubling time, and both the quantification of utilisation of aromatic compounds and the detection of phenanthrane metabolites were carried out by gas chromatography and mass-spectrometry. Two co-cultures of phenanthrene- and anthracene-biodegrading bacteria (PHEN-Cult and ANT-Cult, respectively) were isolated and characterised. The two co-cultures grew rapidly, reaching maximum counts of 1010 CFU/mL, within 2–10 days. The doubling time (dt) fell between 0.5–1.5 day (at PHEN and ANT concentrations of 1–100 ppm), making them among the most active PAH degrading microorganisms described so far. PHEN-Cult consists of two strains, Pseudomonas citronellolis, PHC3Z1A, and Stenotrophomonas maltophilia, JPHC3Z2B, while ANT-Cult is made of Ralstonia pickettii, JANC1A and Thermomonas haemolytica, JANC2B. Both co-cultures were more active at pH 7, 0–4% NaCl, and 37–40°C. They were also able to utilise naphthalene, salicylic acid and catechol. Starting with 100 ppm, within 15 days, 50–75% of PHEN and ANT were degraded, and the following were the PHEN metabolites that were identified: 3-naphthyl-allyl alcohol, phthalic acid ethyl diester, 2-hydroxybenzalpyruvic acid-methyl ester. These bacteria are appropriate for the removal of PHEN and ANT in contaminated environments, thus further studies are warranted to establish their ability to remove these PAHs in pilot and large scale.
Źródło:
Archives of Environmental Protection; 2018, 44, 2; 43-54
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation of the highly complex polycyclic aromatic hydrocarbon coronene by the halophilic bacterial strain Halomonas caseinilytica, 10SCRN4D
Autorzy:
Okeyode, Ajibola H.
Al-Thukair, Assad
Chanbasha, Basheer
Nazal, Mazen K.
Afuecheta, Emmanuel
Musa, Musa M.
Algarni, Shahad
Nzila, Alexis
Powiązania:
https://bibliotekanauki.pl/articles/27311570.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
coronene
biodegradation
polycyclic aromatic hydrocarbons
Halomonas
gas chromatography
Opis:
Polycyclic aromatic hydrocarbons (PAHs) are significant pollutants found in petroleum products. There is ample literature on the biodegradation of PAHs containing less than five rings, but little has been done on those with more than five rings. Coronene (CRN), a seven-ring-containing PAH, has only been shown to be degraded by one bacterial strain. In this study, a bacterial strain 10SCRN4D was isolated through enrichment in the presence of CRN and 10% NaCl (w/v). Analysis of the 16S rRNA gene identified the strain as Halomonas caseinilytica. The strain was able to degrade CRN in media containing 16.5–165 μM CRN with a doubling time of 9–16 hours and grew in a wide range of salinity (0.5–10%, w/v) and temperature (30–50°C) with optimum conditions of pH 7, salinity 0.5%–10% (w/v), and temperature 37°C. Over 20 days, almost 35% of 16.5 μM CRN was degraded, reaching 76% degradation after 80 days as measured by gas chromatography. The strain was also able to degrade smaller molecular weight PAHs such as benzo[a]pyrene, pyrene, and phenanthrene. This is the first report of Halomonas caseinilytica degrading CRN as the sole carbon source in high salinity, and thus highlights the potential of this strain in bioremediation.
Źródło:
Archives of Environmental Protection; 2023, 49, 3; 78--86
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary suggestions on the Pleistocene palaeovegetation around the Biśnik Cave (Częstochowa Upland, Poland) based on studies of molecular fossils from cave sediments
Autorzy:
Krajcarz, Maciej T.
Gola, Marek R.
Cyrek, Krzysztof J.
Powiązania:
https://bibliotekanauki.pl/articles/2026713.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cave sediments
biomarkers
n-alkanes
gas chromatography
palaeoenvironment
Opis:
Bioenik Cave is an im por tant site of Mid dle Palaeo lithic, with the lon gest se quence of Neanderthal set tle ment phases in Cen tral Eu rope. In the pre vi ous stud ies of the Bioenik sed i ments, dif fer ent el e ments of palaeoenvironment in the pe ri - ods of Neanderthal oc cu pa tion have been re cog nised, ex cept of palaeovegetation, which could not be de rived be cause of lack of pre served plant mi cro- or macrofossils. The cur rent work is an at tempt to re con struct palaeovegetation in vi - cin ity of the Bioenik Cave, us ing anal y sis of com po si tion of plant-de rived n-al kanes, pre served in sed i ments. In our study, we an a lyzed one sam ple from each of the sed i ment’s lay ers 11 – 19c (early Late Pleis to cene and late Mid dle Pleis to cene). Abun dant n-al kanes (mostly n-C27, n-C29 and n-C31) were found in all the sam pled lay ers ex cept for the lay ers 12, 16 and 19d, show ing no al kanes at all. There is clear di ver si fi ca tion of n-al kanes com po si tion and CPI (car bon pref er ence in dex) val ues be tween lay ers. Anal y sis of this com po si tion, al lows us to claim that the lay ers 11 and 14 were ac cu mu lated when the cave’s vi cin ity was cov ered by dense co nif er ous for ests, hence upon warm cli mate. The lay ers 19, 19a lower, 19b and 19c, pre sumably orig i nated dur ing cold pe ri ods when open wood lands or grass lands dom i nated. The other an a lyzed lay ers could be con nected with in ter me di ate veg e ta tion in form of open wood land. How ever, not all of the achieved re sults stay in com pli ance with the ac tual stra tig ra phy, es tab lished bas ing on lithological data and palaeo ec ol ogy of fos sil fauna, and we hope that ex pla na tion of this dis crep ancy would be pos si ble af ter more ex ten sive stud ies of mo lec u lar fos sils are done.
Źródło:
Studia Quaternaria; 2010, 27; 55-61
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczanie objętości kapilary pomiarowej zaworu sześciodrożnego w chromatografii gazowej
The marking volume of sample loop of six port valve in gas chromatography
Autorzy:
Czech, K.
Słomkiewicz, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/270464.pdf
Data publikacji:
2011
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
chromatografia gazowa
kapilary dozownicze
gas chromatography
sample loop
Opis:
Przedstawiono metodę pomiaru objętości kapilar dozowniczych, złączy gazowych i wewnętrznych kanalików zaworów sześciodrożnych używanych do pobierania próbek w chromatografii gazowej. Objętości oznaczano wagowo rtęcią. Określono wpływ temperatury zaworu sześciodrożnego z kapilarą dozowniczą na wielkość pobieranej próbki.
The method of measurement of volume the sample loop, gas joints and the internal channels of six-port valves used to taking the samples in gas chromatography. The volumes were marked by weight of mercury. The effect of temperature six-port valve with sample loop on quantity of taken sample was determined.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2011, 16, 2; 93-98
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PURITY DETERMINATION OF THE STARTING MATERIALS USED IN THE SYNTHESIS OF PHARMACEUTICAL SUBSTANCES
Autorzy:
Groman, Aleksandra
Stolarczyk, Elżbieta
Mucha, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/895661.pdf
Data publikacji:
2019-02-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
quality control
Imatinib
BOSENTAN
gas chromatography
method validation
Opis:
High requirements on the API quality mean that the quality control of the starting material is crucial to the manufacturing process of drug substances. Three sensitive methods for the purity determination of the following starting materials: ethylene glycol (method I), 3-acetylpyridine (method II) and 4-chloromethyl-5-methyl-1,3-dioxol-2-one (method III) used in the synthesis of selected drug substances were developed using GC-FID techniques. All the methods were validated according to the International Conference on Harmonization guidelines. The correlation coefficient values were found about 0.99. The obtained RSD values from the replicate injections in the range of 20 - 120% of the nominal concentration ensured the precision.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 29-35
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on carcinogenic PAHs emission generated by vehicles and its correlation to fuel and engine types
Autorzy:
Kumar, V.
Kothiyal, N. C.
Powiązania:
https://bibliotekanauki.pl/articles/949327.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
polycyclic aromatic hydrocarbons
gas chromatography
pollutants
concentration
season
Opis:
The objective of this study was to find major PAHs produced in ambient air from the automobile exhaust as a function of fuels (diesel, petrol, and biodiesel) and engine type qualitatively and quantitatively. The recovery range was found between 30% and 70%. The study was carried out on two, three, and four wheelers. Biodiesel samples tested in the study were synthesized indigenously from different starting raw materials and analyzed for PAHs concentration in the exhaust on a Honda genset (EBK 2000AC Model). Biodiesel samples were blended with diesel in different ratio (25:75, 35:65 and 45:55) to investigate the exhaust behavior. Biodiesel was blended with Diesel the concentration of almost all PAHs reduces in comparison to pure Diesel exhaust. B(a)A and B(a) P was the common PAH found in higher concentration in almost all fuels. FTIR results indicate esterification of vegetable oil and NMR results indicate a complete conversion of oils into biodiesel.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 1; 48-58
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioassay and chemical assay of isoxaflutole residue in soil
Autorzy:
Swarcewicz, M
Bhowmik, P C
Praczyk, T
Skrzypczak, G
Powiązania:
https://bibliotekanauki.pl/articles/802438.pdf
Data publikacji:
2003
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
gas chromatography
soil residue
isoxaflutole herbicide
herbicide
bioassay
Opis:
The objective of this study was to evaluate plant bioassay techniques for various concentrations of isoxaflutole in soil and to compare them with the capillary gas chromatography (GLC). The field experiments with maize were conducted at three locations: South Deerfield, MA (USA), Brody and Winna Góra (Poland) in 1997 and 2000. A silt loam (typical Udifluvents soil) from South Deerfield, was used for the bioassay study. The chemical method was used for two soils from Experiment Stations, Brody and Winna Góra (Poland). The isoxaflutole half-life was 4 days in the Brody soil and 8 days in the South Deerfield soil. The degradation rate of isoxaflutole was very fast during the first ten days after treatment and the second phase of degradation was much slower. The bioassay method was more sensitive than the GLC and showed residues of the herbicide in the South Deerfield soil in 120 DAT. The amount of isoxaflutole residues in Brody soil was 15.3% in 21 DAT, if analyzed by GLC. In Winna Góra soil analyzed by GLC no residue was detected in 19 DAT. Bioassays have advantages over instrumental techniques because they provide more information on the biological significance of the remaining isoxaflutole, and its degradation products in soil. Instrumental methods are more costly and time consuming, as compared to bioassay methods.
Celem badań było opracowanie metody biologicznej oznaczania pozostałości nowego herbicydu isoksaflutolu w glebie z równoczesnym porównaniem uzyskanych wyników za pomocą metody chemicznej. Badania szybkości zanikania isoksaflutolu w glebie prowadzono w 1997 roku w doświadczeniu polowym z kukurydzą w Stacji Doświadczalnej South Deerfield, MA (USA) oraz w 2000 roku w Stacjach Doświadczalnych w Brodach i Winnej Górze. Glebę z South Deerfield oznaczano metodą biologiczną stosując pszenicę (Triticum aestivum L.) i rzepak (Brassica napus L.) jako rośliny testowe, natomiast w Polsce stosowano kapilarną chromatografię gazową. Czas połowicznego zaniku isoksaflutolu wynosił 4-8 dni zarówno przy metodzie biologicznej, jaki i chemicznej. Szybkość zanikania herbicydu w glebie była bardzo duża w pierwszych dziesięciu dniach doświadczenia, a następnie uległa znacznemu zmniejszeniu. Stwierdzono, że metoda biologiczna okazała się bardziej czuła od chemicznej. Metoda chemiczna jest czasochłonna i kosztowna, co stanowi jej ujemną stronę.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2003, 492
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GC investigation of post-irradiation oxidation phenomena on polypropylene
Autorzy:
Głuszewski, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2055682.pdf
Data publikacji:
2021
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gas chromatography
polypropylene
post-radiation oxidation
protective effect
radiolysis
Opis:
The paper summarizes the results of research on gas products of polypropylene (PP) radiolysis. Particular attention was paid to the phenomena of post-radiation degradation of PP. The protective effect of selected aromatic compounds was investigated. The research was carried out both from the point of view of obtaining radiation-resistant PP varieties and the possibility of accelerating biodegradation phenomena, e.g., PP/cellulose composition. The phenomena of post-radiation chain oxidation of PP were investigated by gas chromatography (GC). The GC in the system used (packed column, thermal conductivity detector, argon – carrier gas) enables the determination of H2, O2, CO, and CH4 in one measurement. The samples were irradiated with electron beams (EBs) accelerated in accelerators: Elektronika 10/10 with a power of 10 kW and energy of 10 MeV and LAE 13/9 with a power of 9 kW and energy up to 13 MeV. In the tests, PP without stabilizing additives (obtained directly from the production line) and non-stabilized styrene were used. Radiolytic efficiency of hydrogen evolution allowed us to estimate the number of originally formed free radicals. The maintenance of the secondary oxidation processes was the loss of oxygen and the formation of oxidation products (CO, CH4). Attention is paid to the protective effect of aromatic compounds (polystyrene (PS), polyethylene terephthalate (PET), anthracene, fluoranthene, acenaphthene, pyrene, naphthalene) both at the stage of hydrogen atom separation and the secondary oxidation process. The examples of post-radiation oxidation of PP irradiated in cryogenic conditions (–196°C) are presented. All used aromatic compounds showed a protective effect in PP radiolysis. We suppose that this phenomenon is responsible for the charge transfer along the polymer chain from the ionization spurs to the aromatic compound. The protective ranges of PS in PP radiolysis were estimated for the variously prepared PP/PS type compositions from 6 mers to 28 mers.
Źródło:
Nukleonika; 2021, 66, 4; 187--192
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 235

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