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    Wyświetlanie 1-7 z 7
    Tytuł:
    Jakość wody jako jeden z czynników determinujących właściwości mas formierskich z bentonitem
    Water Quality as One of the Factors Determining the Properties of Bentonite Moulding Sands in Iron Foundry
    Autorzy:
    Harabasz, M.
    Holtzer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380947.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    jakość wody
    masa formierska
    masa bentonitowa
    zasolenie wody
    przewodnictwo elektrolityczne
    jakość odlewu
    water quality
    moulding sand
    water salinity
    electrolytic conductivity
    casting quality
    Opis:
    W artykule omówiono problem jakości wody, która wykorzystywana jest w cyklu produkcyjnym odlewni stosującej masy z bentonitem. Praktycznie jakość wody stosowanej do odświeżenia masy z bentonitem, jak i jej chłodzenia nie jest przedmiotem rozważań w krajowych odlewniach. Zagadnienie to dotyczy wpływu stopnia zasolenia wody na właściwości wytrzymałościowe mas z bentonitem, a w konsekwencji na jakość gotowych odlewów. W kolejnych cyklach obiegu masy następuje kumulacja soli w masie i pogorszenie właściwości wytrzymałościowych, szczególnie wytrzymałości na rozciąganie w strefie przewilżonej. Parametrem charakteryzującym stopień zasolenia wody jest przewodnictwo elektrolityczne. W artykule przedstawiono sposób zmniejszenia zasolenia wody miejskiej metodą odwróconej osmozy oraz uzyskane efekty w zakresie zmniejszenia zużycia mieszanki bentonitowej. Prawdopodobnie głównymi jonami powodującymi wzrost przewodnictwa są jony Cl-.
    The article discusses the problem of water quality, which is used in the foundry used green sand in production cycle. The issue involves the problem of the salinity of water, which translates mainly to reduce the strength properties of the green sand. This article presents a method of reducing the salinity of city water and the results of its systematic research. It also indicated the results of green sand, done with the addition of city water with a high and a low conductivity. Analyses show that water is a determining factor in the properties of the sand mould, so the focus should be on maintaining its high quality.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 45-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the quality and irrigation purpose suitability of alluvial water in erfoud, Morocco
    Autorzy:
    Latos, Beata
    Szczucińska, Anna
    Kozłowski, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/1051178.pdf
    Data publikacji:
    2019-09-30
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    water quality
    groundwater chemistry
    salinity
    SAR
    Morocco
    Opis:
    Dry areas are especially exposed to the risk of water shortages and elevated mineralization. High water salinity, caused by low precipitation, high evaporation and human impact, usually strongly limits the use of the water for irrigation. The aim of the study was to assess the quality and irrigation purpose suitability of alluvial water in the Erfoud oasis, Morocco. The samples of water were collected from 20 wells in June 2017. We observed excessive concentrations of many parameters i.a.: NO3, Cd, Ni, Na, NH4, Cl, SO4, Fe, Cr. To determine the possibility to use the water for irrigation purposes, the Sodium Adsorption Ratio (SAR), sodium percentage (%Na), permeability index (PI), Kelly’s ratio (KR), magnesium hazards (MH) and electrical conductivity (EC) were assessed. The values of KR and MH qualified the waters as unsuitable for irrigation purposes. The observed %Na indicates that the groundwater is permissible for irrigation purposes, and permeability index, that it is of moderate quality. However, water classification using the SAR vs EC diagram confirms its high and very high alkali and salinity hazard. The mean EC value of the water was 9.5 mS cm−1.
    Źródło:
    Quaestiones Geographicae; 2019, 38, 3; 67-79
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrochemical characteristics and water quality assessment of Lake Dayet Erroumi – Khemisset, Morocco
    Autorzy:
    El Qryefy, Mohamed
    Ouardi, Jamila
    Najy, Mohamed
    Belghyti, Driss
    El Kharrim, Khadija
    Powiązania:
    https://bibliotekanauki.pl/articles/1844350.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Dayet Erroumi
    hydrochemical characteristics
    Morocco
    salinity
    water quality
    Opis:
    The objective of this paper is to study the hydrochemical characteristics of Lake Dayet Erroumi (Khemisset, Morocco). Three sampling campaigns were carried out in April, July and November 2019. The temperature, pH and electrical conductivity were measured in situ using Hanna Instruments HI 98280. Concentrations of calcium, magnesium, carbonate, bicarbonate and chloride were analysed by the volumetric method. The atomic absorption technique was used to determine sodium, potassium, nitrate and sulphate. The physico-chemical analysis of the water indicates that the pH is basic. The nitrate and sulphate concentrations show that the water is of good quality according to Moroccan surface water guidelines. Furthermore, the hydrochemical facies of water is of the sodium-chloride type according to the Piper diagram. The value of the electrical conductivity indicates that the lake water has high salinity. The high mineralization of water is explained by the leaching from evaporitic rocks in the region. The principal component analysis shows that the spatial and temporal variation in salinity constitutes the major phenomenon of the hydrochemical characteristics of this lake. Salinity varies inversely with the pH value. The salinity of the water is controlled by abiotic factors (rain and evaporation). However, other parameters (pH, nitrate, carbonate and bicarbonate) depend on biotic factors. Evaporation plays a crucial role in the seasonal variation of the water chemical composition. During wet seasons, the mineralization of water decreases due to dilution by rainwater and the water level of the lake rises (high water period). During dry seasons, lake water evaporates and consequently the mineralization of the water increases, which explains the increase in salinity during the low water period.
    Źródło:
    Journal of Water and Land Development; 2021, 49; 179-187
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of water pollution dynamics in Vistula river on Warsaw city area
    Autorzy:
    Dębska, K.
    Rutkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/101015.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    water quality
    Vistula river
    Warsaw
    salinity
    biogenic elements
    permanganate index
    Opis:
    The paper presents change of water quality within Vistula River in the city of Warsaw. Water samples for analysis were taken from four different measurement points in the period from February to June 2016. Based on the results of laboratory studies it was demonstrated that the Vistula River in Warsaw is exposed to the input of pollutants contributing to increase the salinity, especially in winter and early spring. The concentration of both chlorides and sulphates were highest in February and was decreasing in subsequent months of the year. At the same time it has been shown that during the entire study period the concentration of Cl– ion exceeded the limit values for water quality II class in Poland. While the SO4 2– concentrations in water samples taken in the winter months (February-March) exceeded the limit values for the second quality class, in April, it was within the acceptable range for II class water quality, and in May and June does not exceed the value referred to as standard for I class of water quality. Based on the analysis of indicators of nutrients (N-NH4 , N-NO3 , Ptot.) it was found that the Vistula is not exposed to eutrophication due to their low concentration, which indicates a very good water quality. At the same time permanganate index (CODMn) indicates a low organic load of Vistula.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/2; 849-861
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of salinity changes in the Szczecin Lagoon along the fairway Szczecin-Swinoujscie during 1956-57, 1973-76 and 1991-94
    Autorzy:
    Poleszczuk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/84930.pdf
    Data publikacji:
    1997
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    salinity change
    Szczecin Lagoon
    Szczecin-Swinoujscie fairway
    ichthyofauna
    animal species
    fish
    water quality
    bottom water
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1997, 01
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eutrophication problems in the Western Harbour of Alexandria, Egypt
    Autorzy:
    Dorgham, M.M.
    Abdel-Aziz, N.E.
    El-Deeb, K.Z.
    Okbah, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/49044.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    biomass
    nutrient
    water quality
    Alexandria Western Harbour
    plankton
    salinity
    Egypt
    eutrophication
    Opis:
    Eutrophication-related problems in the Western Harbour ofA lexandria were studied monthly from April 1999 to March 2000. Variation in salinity appeared to be the key to all changes in water quality and plankton abundance in the harbour. Both at the surface and near the bottom the salinity was lower (annual average: 35.1 and 38.3 PSU respectively) than in the open sea (39 PSU). Dissolved oxygen levels indicated poor aeration conditions along the water column (2.3–3.98 mg l−1). Average pH values were approximately similar in the two layers (8.1 and 8 respectively) but exhibited different ranges ofv ariations. Nutrient salts varied widely, often occurring in high concentrations, with ranges of 0.12–5.7 and 0.06–2.6 μM at the surface and the bottom respectively for phosphate, 0.21–20.46 and 0.25–18.12 μM for nitrate, 0.29–3.3 and 0.23–1.66 μM f or nitrite, 0.56–57.46 and 2.32–43.73 μM for ammonia and 0.3–36.3 and 0.48–38.4 μM for silicate. As a result ofn utrient enrichment, phytoplankton growth was very intensive, reflected by an abnormally high concentration ofc hlorophyll a (annual average: 33.82 μg l−1). At the same time the death ofl arge numbers ofp hytoplankton cells could be inferred from the relatively large amount of phaeopigment (annual average: 10.39 μg l−1). The high levels ofn utrient salts and phytoplankton biomass together serve as a good indicator ofhig h eutrophication levels in the Western Harbour throughout the year. These conditions clearly affected the zooplankton stock, which varied between 5.8–93.6×103 indiv. m−3, although for most of the time values remained at a low level (annual average: 26 728 indiv. m−3).
    Źródło:
    Oceanologia; 2004, 46, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality of waters of Szczecin Lagoon and Pomeranian Bay
    Jakość wód Zalewu Szczecińskiego i Zatoki Pomorskiej
    Autorzy:
    Wira, J.
    Wira, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/84958.pdf
    Data publikacji:
    2003
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    water quality
    Szczecin Lagoon
    Pomeranian Bay
    Odra mouth
    high fluctuation
    fluctuation
    chemical composition
    river water
    salinity
    nitrate
    nitrogen
    total phosphorus
    phosphorus
    phytoplankton blooming
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2002-2003, 07
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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