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    Wyświetlanie 1-5 z 5
    Tytuł:
    Determination of petroleum pollutants in coastal waters of the Gulf of Gdańsk
    Autorzy:
    Stelmaszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48150.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    oil content
    pollutant determination
    fluorescence
    coastal water
    Gdansk Gulf
    petroleum substance
    sea water
    petroleum pollution
    Opis:
    The paper presents an improved method of determining petroleum pollutants in water based on fluorescence, which allows the oil content to be estimated with an accuracy better than 50%. The method was used to measure the oil content in Gulf of Gdańsk seawater sampled at Gdynia-Orłowo between January 2006 and September 2008. The 174 measurements made during this period ranged from 1 to 120 μg kg−1, but the majority did not exceed 20 μg kg−1. The most probable level of contamination is c. 5 μg kg−1.
    Źródło:
    Oceanologia; 2009, 51, 1; 85-92
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The contribution of fluorescence to measurements of light scattering in oil-in-water emulsions
    Autorzy:
    Stelmaszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48940.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    contribution
    emulsion
    fluorescence
    light scattering
    marine environment
    measurement
    oil pollution
    oil-water emulsion
    petroleum
    sea water
    ultraviolet radiation
    Opis:
    The paper presents some results of research on the fluorescence properties of petroleum oil-in-water emulsions. The research addresses the question of measuring and modelling light fields in an oil-polluted marine environment. The fluorescence of the emulsion manifests itself in the spectral range from 260 to over 400 nm and is much less intensive in the visible light region. Fluorescence is always weaker than the radiation scattered in an emulsion. The measurement and modelling of ultraviolet radiation scattering requires fluorescence to be taken into consideration, but in the visible spectral region this phenomenon is negligible.
    Źródło:
    Oceanologia; 2011, 53, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship as a source of the sea pollution with oil
    Autorzy:
    Stelmaszewski, A.
    Otremba, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/247988.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    maritime transport
    seawater
    petroleum
    environmental protection
    Gulf of Gdansk
    Opis:
    The subject of marine vessel as a source of the sea pollution was taken because of very adverse impact of petroleum pollutants on the natural environment. Oil pollutions concern especially marine environment. However, petroleum inflows to the sea from many different sources, exploitation of the fleet are one of the significant causes of oil presence in the marine environment. MARPOL Convention requires the states parties thereto to monitor the state of contamination [3] and this is a second reason of taking this subject. During the past years, several tests of petroleum content in the Gulf of Gdansk were made by the Physics Department of Gdynia Maritime University. In total 115 samples of water were collected and analyzed during the period from 2004 to 2009 year in the Gulf of Gdansk, which is an area of intense ships traffic because of two great complexes of harbours located in Gdansk and in Gdynia. These tests were carried out with the help of Institute of Oceanology Polish Academy of Sciences during cruises of the r.v. “Oceania”. Petroleum concentration in seawater was determined by means of improved fluorescence method. Oil in water concentration ranged from value below of the detection limit, that is 10–9 (less than 1 ppb), up to 3.5ź10–7 (350 ppb). Average concentration of oil was 4.3ź10–8 (43 ppb). Obtained results confirmed that Vistula River could be a source of petroleum pollution of the Gulf of Gdansk. Apart from this, vessels are the significant sources of oil in the seawater too. The most polluted places were founded in the area where ships crossed the Gulf of Gdansk.
    Źródło:
    Journal of KONES; 2012, 19, 1; 385-389
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light scattering in Baltic crude oil - seawater emulsion
    Autorzy:
    Stelmaszewski, A.
    Krol, T.
    Toczek, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/47707.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine environment
    sea water emulsion
    Baltic Sea
    light scattering
    sea water
    Baltic crude oil
    petroleum
    Opis:
    The paper discusses the scattering of radiation by a Baltic crude oil –sea water emulsion. The scattering spectrum calculated using the Mie solution in the spectral range from 380 nm to 730 nm is compared with the measured spectrum of light scattered through a right angle. Spectra in the wavelength range from 210 nm to 730 nm were measured using a spectrofluorimeter for fresh and stored samples of the Baltic crude oil emulsion. Scattering increases with wavelength in the UV range and then decreases slightly with the wavelength of visible light. The result of the calculation is similar to the measured spectra. Both the calculated and measured spectra display numerous relative extremes throughout the spectral area. Light scattering in the emulsion decreases during storage as the oil concentration in the medium diminishes. The results also demonstrate that the single scattering model describes the phenomenon correctly.
    Źródło:
    Oceanologia; 2009, 51, 3; 405-414
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variability in the optical properties of a crude oil - seawater emulsion
    Autorzy:
    Krol, T.
    Stelmaszewski, A.
    Freda, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/48199.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    variability
    Sopot
    crude oil
    petroleum pollution
    emulsion
    conference
    Baltic Sea
    optical property
    light scattering
    Opis:
    The paper analyses the optical properties of a crude oil –sea water emulsion, which is a form of petroleum pollution of the sea. These properties depend on the spillage concentration, the optical characteristics of the seawater and oil in question, and on the size distribution of the oil droplets. They may be described by the attenuation specific cross-sections and absorption specific cross-sections. Specific cross-sections and other optical parameters for droplets of a Baltic crude oil –Bal tic seawater emulsion were calculated using Mie’s solution. These characteristics were computed for fresh and weathered petroleum.
    Źródło:
    Oceanologia; 2006, 48, S
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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