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Tytuł:
Epoxidation of allyl-glycidyl ether with hydrogen peroxide over Ti-SBA-15 catalyst and in methanol medium
Autorzy:
Walasek, M.
Wróblewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/778347.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
diglycidyl ether
allyl-glycidyl ether
Ti-SBA-15
epoxidation
Opis:
This work presents the studies on the epoxidation of allyl-glycidyl ether (AGE) over the Ti-SBA-15 catalyst. In these studies an aqueous hydrogen peroxide was used as an oxidizing agent and as a solvent methanol was applied. The studies on the influence the following parameters: temperature (20–80°C), molar ratio of AGE/H2O2  (1:1.5–5:1), methanol concentration (10–90 wt%), catalyst content (1–9 wt%) and reaction time (15–240 min.) were carried out and the most favourable values of these parameters were chosen (temperature 80°C, molar ratio of AGE/H2O2 = 5:1, methanol concentration 30 wt%, catalyst content 3 wt% and the reaction time 240 min.). At these conditions the functions describing the process reached the following values: the selectivity of diglycidyl ether (DGE) 9.2 mol%, the conversion of AGE 13.9 mol% and the efficiency of H2O2  conversion 89.9 mol%.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 4; 9-14
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historia eteru
Autorzy:
Rossa, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2158626.pdf
Data publikacji:
2012
Wydawca:
Instytut Studiów Międzynarodowych i Edukacji Humanum
Tematy:
history
ether
Einstein
Opis:
The author, on the basis of the history of philosophy and the history of physics, presents the history of ether. Particular attention is paid to the beliefs of Albert Einstein on the issue.
Źródło:
Prosopon. Europejskie Studia Społeczno-Humanistyczne; 2012, 2(4); 267-294
1730-0266
Pojawia się w:
Prosopon. Europejskie Studia Społeczno-Humanistyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological aspects of synthesis of poly(ethylene glycol) mono-1-propenyl ether monomers
Autorzy:
Urbala, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/779637.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
polyethylene glycol allyl ether
1-propenyl ether
isomerization
ruthenium complex
photopolymerization
Opis:
For the first time, the technological aspects of the highly productive and selective synthesis of UV-reactive poly(ethylene glycol) mono-1-propenyl ether monomers was developed. The solvent-free isomerization of model commercial available 2-allyloxyethanol and allyloxypoly(ethylene glycol) derivatives, type Allyl–[OCH2CH2]n–OH, n = 1–5, into a 1-propenyl derivative under the homogeneous catalysis conditions using the ruthenium complexes were evaluated. The effect of a various reaction conditions (i.e. the concentration of [Ru] complex, the reaction temperature, reaction gas atmosphere) together with trace amounts of allyl hydroperoxides formed via autoxidation reaction of allyl substrates on the productivity of catalyst was examined in detail. Moreover, the significant role of the allyl substrate structures on the catalytic activity of ruthenium catalysts were also recognized. The optimal parameters of the scaled-up synthesis together with productivity of catalyst were first established.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 3; 55-63
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selectivity of diphenyl-ether herbicide with postemergence applications in chickpea
Autorzy:
Silva, L.G.B.
Da Silva Araujo, L.
Goncalves, D.J.
Souza Valente, M.
Da Silva, A.R.
Nascimento, W.M.
Ribeiro da Cunha, P.C.
Powiązania:
https://bibliotekanauki.pl/articles/2084719.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cicer arietinum
diphenyl-ether herbicides
weeds
Opis:
There are few reports in literature about the selectivity of postemergence application of herbicides for the control of eudicotyledon weeds (broadleaf) in chickpea. For this reason, the aim of this study was to investigate the selectivity of diphenyl-ether herbicides in chickpea influenced by the herbicides and application rates. A field experiment was conducted from February to June 2017 in Urutaí, state of Goiás, Brazil. Cultivar BRS Aleppo was used in the experiment. The experiment was set up in a randomized block design with 2 × 3 + 1 factorial arrangement and three replications. The first factor was herbicides (fomesafen and lactofen) with the second factor being herbicide rate (50, 75, and 100% of referenced rate) plus an untreated check as a comparison. The applied rates of herbicides were 250 and 180 g ⋅ ha–1 of fomesafen and lactofen, respectively. The selectivity of herbicides was evaluated according to agronomic characteristics (plant population, height, dry matter, number of pods per plant and 100-grain weight) and yields. Both herbicides, regardless of dosage, were selective in chickpea cultivation, even exhibiting leaf necrosis symptoms with visible injuries below 20% with no effect on yield.
Źródło:
Journal of Plant Protection Research; 2019, 59, 3; 350-354
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption behavior and mechanism of an ether amine collector on collophane and quartz
Autorzy:
Fang, Ji
Ge, Yingyong
Yu, Jun
Powiązania:
https://bibliotekanauki.pl/articles/109589.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
collophane
collector
ether amine surfactant
flotation
Opis:
The adsorption behaviors of an ether amine surfactant, N1-(3-((8-methyl-nonyl)oxy) propyl)propane-1,3-diamine, on collophane and quartz were studied. Batch adsorption experiments were conducted to characterize the thermodynamic behavior of the adsorption process and to calculate the maximum adsorption. Results demonstrated that the adsorption of the ether amine on quartz was greater than collophane. Adsorption mechanisms were studied by means of contact angle measurement, zeta potential measurement, FT-IR analysis, and X-ray photoelectron spectroscopy. The results showed that the adsorption of the ether amine surfactant on quartz surface was easier and more efficient than collophane. Micro-flotation tests testified that the collector can efficiently separate collophane from quartz at room temperature in neutral medium.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 301-310
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Octabromodiphenyl ether — porphyrogenicity after repeated administration to rats
Autorzy:
Bruchajzer, Elżbieta
Frydrych, Barbara
Szymańska, Jadwiga A.
Powiązania:
https://bibliotekanauki.pl/articles/2180018.pdf
Data publikacji:
2012-09-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
octabromodiphenyl ether (OctaBDE)
porphyrins
rat
repeated administration
Opis:
Objectives: Octabromodiphenyl ether (OctaBDE) is a fl ame retardant which has been withdrawn from common use due to its negative effect on the environment. The literature data regarding its toxicity addresses its effect on liver function, the endocrine and reproductive systems, as well as its developmental toxicology aspects. The aim of this study was to investigate the effect of repeated administration of OctaBDE on heme biosynthesis in rats. Materials and Methods: The study was performed on female Wistar rats. OctaBDE was administered intragastrically at four different doses (2, 8, 40 or 200 mg/kg/day) for 7, 14, 21 or 28 days. The following measures of heme synthesis disturbance were used: urinary excretion of porphyrins, liver concentration of porphyrins, the activity of delta-aminolevulinate synthase (ALA-S) and delta-aminolevulinate dehydratase (ALA-D) in the liver. Results: After 28 days of exposure, lower ALA-S and ALA-D activity was observed in the liver. Additionally, increased concentrations of high carboxylated porphyrins (octa- and heptacarboxyporphyrins) were found in the liver: from 2- to 10-fold after the 2 mg/kg/day doses and from 4- to 14-fold after the 8-200 mg/kg/day doses. The porphyrogenic effect of OctaBDE was also evidenced by augmented, dose-dependent and exposure time-dependent, concentrations of total porphyrins in urine (2-7.5-fold increase) and their urinary excretion (2-9-fold increase). Tetracarboxyporphyrins predominated in the urine; their concentrations increased 2.5-10 fold. Conclusions: The study revealed that repeated exposure to OctaBDE affects heme biosynthesis and the levels of porphyrins. The lowest effective level which induced changes in porphyrin concentration was 2 mg/kg/day.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2012, 25, 4; 392-403
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sytuacja na rynku kryptowalut w 2018 roku
Autorzy:
Łuczyk, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/518218.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Gdański. Wydział Ekonomiczny
Tematy:
Kryptowaluta
altcoin
Ether
Cryptocurrency
Bitcoin Cash
Crisis
Opis:
Artykuł porusza kwestie związane z kryzysem na rynku kryptowalut w 2018 roku. Na początku artykułu zostało wyjaśnione pojęcie kryptowaluty. Autor dokonał charakterystyki wybranych krypotwalut. Ideą artykułu było zaprezentowanie zmian mających miejsce na rynku kryptowalut w 2018 roku. W artykule zostały przedstawione dane na temat kapitalizacji rynku, oraz kursów wybranych kryptowalut. Na potrzebę artykułu autor wybrał wydarzenia, którego w jego ocenie miały największy wpływ na powstanie kryzysu. Zostały omówione działania rządowe oraz działania ze strony portali społecznościowych.
The article discusses issues related to the crisis on the market of cryptocurrencies in 2018. At the beginning of the article the definition of cryptocurrency was provided. The characteristics of cryptocurrencies have been reviewed by the author. The idea of the article was to present the changes taking place on the market of cryptocurrencies in 2018. The article presents data of capitalization and exchange rates of selected cryptocurrencies. For the purpose of the article, the author chose the events which in his opinion had the greatest impact on the emergence of the crisis, governmental activities and activities from social networks have been discussed.
Źródło:
Zeszyty Studenckie Wydziału Ekonomicznego „Nasze Studia”; 2019, 9; 325-334
1731-6707
Pojawia się w:
Zeszyty Studenckie Wydziału Ekonomicznego „Nasze Studia”
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary phytochemical analysis of Barleria longiflora L.f. using different solvent
Autorzy:
Baskaran, A.
Karthikeyan, V.
Powiązania:
https://bibliotekanauki.pl/articles/1063059.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Barleria longiflora
chloroform and ethanol
petroleum ether
soxhlet
Opis:
Present investigation deals with the preliminary phytochemical analysis of Barleria longiflora. The leaf, stem and root of this plant were subjected to successive soxhlet extraction using petroleum ether, chloroform and ethanol. The various part of extracts, were subjected to preliminary phytochemical screening for different classes of phytoconstituents. Phytochemical analysis, ethanol extracts showed presence of all compounds.
Źródło:
World Scientific News; 2019, 124, 2; 319-325
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An influence of correction of the ignition advance angle on the combustion process in SI engine fuelled by lpg with the addition of DME
Autorzy:
Kubica, Grzegorz
Marzec, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/243249.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dimethyl ether
DME+LPG
fuel blend
SI engine
Opis:
The paper presents the results of tests of the SI engine fuelled by LPG with the addition of DME in the form of a mixture of gaseous fuels. Experimental tests were carried out on a chassis dynamometer in the full range of engine loads, at a fixed rotational speed: 2000, 2500 and 3000 rpm. The use of dimethyl ether (DME) as a fuel component makes it possible to exploit its important advantages. DME can be produced as a renewable fuel, which is important from the point of view of ecology. Another important fact is the presence of oxygen in this fuel, which has a positive effect on the engine volumetric efficiency. During the tests, the ignition timing was also adjusted due to the very good DME flammability. Two additional correction levels were applied, increasing the ignition advance by 3 and 6 CA degrees, compared to the factory settings of the driver. The analysis of the obtained results allowed determining the dependence of the basic engine parameters, in the function of the correction of ignition advance angle. In the summary, attention was also paid to the possibility of determining corrected maps of the ignition advance angle taking into account the variable proportions of fuel components.
Źródło:
Journal of KONES; 2019, 26, 4; 285-292
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process simulation of dimethyl ether synthesis via methanol vapor phase dehydration
Autorzy:
Bai, Z.
Ma, H.
Zhang, H.
Ying, W.
Fang, D.
Powiązania:
https://bibliotekanauki.pl/articles/779378.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dimethyl ether
methanol dehydration to DME
process simulation
Opis:
The production processes included catalytic dehydration of methanol in an adiabatic fixed-bed reactor and two columns product separations. In this study, the technological process for dimethyl ether (DME) synthesis is built on PRO/II platform based on the combined parameters of the reaction dynamic model for methanol dehydration reaction, the improved NRTL model of the liquid phase, the PR model of vapor phase. In order to validate the proposed model, the simulation results have been compared with the available data from a set of industrial production equipment with a production capacity of 200 000 tonnes per annum. A comparison between the calculated and measured results has proved that these results are satisfactory. The bed height and the volume of the catalytic bed are calculated aim at one million t/a DME yields and while taking account of high-purity DME production. After discussing the influence of feed stage location and reflux ratio for DME product purity, the suitable unit operation conditions are chosen. Accordingly, accurate process simulation results provide the basis and guidance for an improvement and development of the similar industrial device.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 2; 122-127
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Curing of an Aluminized Ammonium Perchlorate Composite Propellant Based on Nitrile Butadiene Rubber Using a Quinol Ether of 1,4-Benzoquinone Dioxime
Autorzy:
Singh, Sudhir
Raveendran, Sidharth
Kshirsagar, Dhirendra R.
Gupta, Manoj
Bhongale, Chetan J.
Powiązania:
https://bibliotekanauki.pl/articles/27788068.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
dinitrosobenzene
nitrile butatadiene rubber
quinol ether
unsaturated rubber
Opis:
The isocyanate-based curing agents used for polyurethane are toxic and hygroscopic in nature. In the present work, an alternate approach was adopted, a reaction between the unsaturated rubber having an α-methylene hydrogen atom and a dinitrosobenzene (DNB) - generating system (quinol ether of 1,4-benzoquinone dioxime, QE) without a catalyst, thus generating a cured system. QE is a novel curing agent for propellant applications which imparts the necessary curing. The curing reaction between nitrile butatadiene rubber (NBR) and quinol ether (QE) was studied by FTIR and the results revealed the formation of anil groups (Ar–C=N). The anil group results from the reaction between NBR and DNB, generated on decomposition of QE. Propellant formulations were prepared with variation of the curing agent from 0.2 to 0.5%. The composition and rheological, mechanical, ballistic and thermal properties of the resulting cured systems were investigated. The viscosity and spreadability were suitable for casting. The tensile strength, modulus, and hardness show an increasing trend and the elongation decreases on varying QE from 0.2 to 0.5% in the propellant. However, all of the compositions showed nearly the same burning rate and pressure exponent. The QE based curing system is non-hygroscopic and has extremely low toxicity. The experimental results revealed that the proposed curing agent may find application in explosives and propellants.
Źródło:
Central European Journal of Energetic Materials; 2022, 19, 1; 18--38
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural products in dentistry
Surowce naturalne w stomatologii
Autorzy:
Pytko-Polonczyk, Jolanta
Muszyńska, Bożena
Powiązania:
https://bibliotekanauki.pl/articles/1033719.pdf
Data publikacji:
2016
Wydawca:
Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Tematy:
"ether oils"
"eugenol"
"flavonoids"
"natural products in dentistry"
"zinc"
Opis:
Modern medicine used many methods of treatment; one of them is phytotherapy. It is documented that plants can not only prevent many diseases, but also cure diseases. Main activities of plant materials used in dentistry are anti-inflammatory, antibacterial, antiviral, decongestant, adtringent, anti-bleeding and regenerating. The natural materials used in dentistry are mainly in the form of lotions, tinctures, infusions, toothpaste, drops and gels. The most important group of active compounds in dental formulations of natural origin include essential oils, monoterpenoides, phenolic compounds, gums, resins, tannins, flavonoids, anthocyanins, carotenoids, chlorophyll, vitamins, elements such as especially zinc and minerals such as AlK(SO4)2. It occurs naturally and is used for control of bleeding, and as an antiseptic. The ideal antimicrobial agent should be effective in removing bacteria responsible for the periodontal disease process; to have the widest possible range of action, does not cause side effects and have a prolonged activity in the oral cavity. Accordingly natural products particularly as essential oils and phenol compounds can, fulfill these tasks.
Źródło:
Medicina Internacia Revuo; 2016, 27, 107; 68-75
0465-5435
Pojawia się w:
Medicina Internacia Revuo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective removal of Ag(I) and Cu(II) by plasticizer membranes with n-(diethylthiophosphoryl)-aza[18]crown-6 as a carrier
Autorzy:
Kolodziejska, M.
Kozlowski, C.
Kozlowska, J.
Ulewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/110729.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
plasticizer membranes
lariat ether
separation
silver(I)
copper(II)
Opis:
The competitive transport of equimolar mixtures of Ag(I) and Cu(II) ions from aqueous source phase (cMe = 0.001 mol/dm3) across polymer inclusion membranes PIMs with N-(diethylthiophosphoryl)aza[18]crown-6 as ion carriers, was studied. The influence of pH of source phase and metal concentration on an efficiency of silver(I) transport through polymer inclusion membranes containing cellulose triacetate as the support and o-nitrophenyl pentyl ether as the plasticizer was studied. The transport selectivity order for the PIM with N-(diethylthiophosphoryl)-aza[18]crown-6 was: Ag(I) >> Cu(II). The metal cations transport rate can be explained by size and nature of substituent in lariat ether molecule, which prefer formation of Ag(I) complex in the membrane phase.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 1; 237-247
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie reakcji Fentona do rozkładu utleniającego eteru etylowo-t-butylowego (ETBE) w wodnych ekstraktach benzyn
Application of the Fentons reaction for oxidative destruction of ETBE contained in water extracts of petrol
Autorzy:
Kędzierska, E.
Konopka, M.
Kardasz, K.
Piotrowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/256398.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
Fenton's reaction
ethyl-t-butyl ether
ETBE
petrol
Fenton's reagent
Opis:
W pracy podjęto próbę usuwania eteru etylowo-t-butylowego (ETBE) z wodnych ekstraktów benzyn poprzez utlenianie nadtlenkiem wodoru w reakcji Fentona. Zdolność ETBE do rozkładu pod wpływem nadtlenku wodoru w temperaturze otoczenia stanowi potencjalną możliwość usuwania tego eteru z wody zanieczyszczonej benzyną, która zawiera ETBE jako komponent.
Ethyl-t-butyl ether (ETBE) is commonly used as a fuel component, which sometimes results in its introduction into the environment, especially to ground water. The aim of this research study is to investigate the activity of Fenton's reagent with the water extracts of the fuels containing ETBE. The ETBE removal was successfully accomplished at ambient temperature in the presence of more than 0,3 g of FeSO4 catalyst per 100 cm3 of the extract.
Źródło:
Problemy Eksploatacji; 2006, 3; 223-231
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and validation of a method for determination of selected polybrominated diphenyl ether congeners in household dust
Autorzy:
Korcz, W.
Strucinski, P.
Goralczyk, K.
Hernik, A.
Lyczewska, M.
Czaja, K.
Matuszak, M.
Minorczyk, M.
Ludwicki, J.K.
Powiązania:
https://bibliotekanauki.pl/articles/876220.pdf
Data publikacji:
2014
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
polybrominated diphenyl ether
dust
household
method validation
recovery
organic pollutant
Opis:
Background. Polybrominated diphenyl ethers (PBDEs) belong to group of so-called persistent organic pollutants (POPs). These compounds occur in nearly all elements of the environment, including household dust which constitutes one of a major route for human exposure. Their main adverse effects on human health are associated mainly with endocrine disruption – they interfere with thyroid function exhibit anti-androgenic action. Objectives. To develop and validate analytical method for determination of BDE-47, BDE-99, BDE-153, and BDE-209 congeners in household dust. Material and methods. Household dust was sampled in residences from Warsaw and the surrounding areas. An automated Soxhlet extraction of samples was then performed and PBDE congeners were subsequently measured in cleaned-up extracts by GC-μECD. The identity of quantified compounds was confirmed by GC/MS. Results. Household dust samples were fortified at levels of 2.88, and 28.8 ng g-1 for BDE-47, BDE-999, and BDE-153, and for BDE-209 at levels of 101.2, and 540 ng g-1. Recoveries ranged between 72 – 106%. The relative standard deviations (RSD) were less than 16% for all PBDE congeners analysed. The relative error determined on the basis of multiple analyses of certified reference material ranged from 1.07 – 20.41%. The method’s relative expanded uncertainty varied between 16 – 21%. Conclusion. The presented method was successfully validated and can be used to measure concentrations of BDE-47, BDE-99, BDE-153 and BDE-209 congeners in household dust.
Wprowadzenie. Polibromowane difenyloetery (PBDE) zaliczane są do trwałych zanieczyszczeń organicznych. Wykrywane są praktycznie we wszystkich elementach środowiska, także w kurzu. Kurz jest istotnym źródłem pobrania polibromowanych difenyloeterów przez człowieka. Szkodliwy wpływ PBDE na zdrowie człowieka wiązany jest głównie z zaburzaniem równowagi układu hormonalnego – zaburzają one m.in. funkcjonowanie hormonów tarczycy oraz działają antyandrogennie. Cel badań. Opracowanie i walidacja metody analitycznej umożliwiającej oznaczanie kongenerów BDE-47, BDE-99, BDE- 153 i BDE-209 w kurzu domowym. Materiał i metody. Materiał do badań stanowiły próbki kurzu pochodzące z domów osób zamieszkałych w Warszawie i okolicach. PBDE ekstrahowano z kurzu z wykorzystaniem aparatu do automatycznej ekstrakcji Soxhlet. Ekstrakt oczyszczano i poddawano analizie instrumentalnej. Oznaczenia zawartości analizowanych kongenerów PBDE prowadzono na GC-μECD, a tożsamość potwierdzano na GC-MS. Wyniki. Próbki kurzu były wzbogacane na poziomie 2,88 ng g-1 i 28,8 ng g-1 dla BDE-47, BDE-99, BDE-153 oraz 101,2 ng g-1 i 540 ng g-1 dla BDE-209. Odzysk mieścił się w zakresie 72 - 106%. Względne odchylenie standardowe (RSD) było mniejsze niż 16% dla wszystkich analizowanych kongenerów PBDE. Błąd względny wyznaczony na podstawie wielokrotnej analizy certyfikowanego materiału referencyjnego wynosił od 1,07% do 20,41%. Względna niepewność rozszerzona zawierała się w zakresie 16-21%. Wniosek. Metoda została zwalidowana i może być wykorzystywana do oznaczania zawartości kongenerów BDE-47, BDE- 99, BDE-153 i BDE-209 w próbkach kurzu domowego.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2014, 65, 2
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 81

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