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    Wyświetlanie 1-9 z 9
    Tytuł:
    Survival of larvae of Nippostrongylus brasiliensis [Nematoda] in solutions of toxic substances
    Autorzy:
    Gadomska, K
    Zakrzewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/839605.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    toxic substance
    Nematoda
    lead
    cadmium solution
    copper solution
    Nippostrongylus brasiliensis
    environment pollution
    cadmium
    zinc
    copper
    larva
    zinc solution
    lead solution
    survival
    Opis:
    The aim of this study was to determine the action of zinc, cooper, lead and cadmium compounds upon N. brasiliensis invasive nematode larvae. The tested larvae were kept in ZnCl2, CuCl2 , Pb(NO3)2 and CdCl2 solutions. The concentrations of toxic substances applied for the study corresponded with level of environmental pollulion. All toxins reduced live - space of larvae. In control group they survived about 69 days. In solutions of the Zn, contaminated with 10, 50, 100 and 200 ppm of toxic substance, they survived 42, 16, 14 days and 72 hours. In solution of Cu, contaminated with 5, 10, 50 and 200 ppm of toxin, live - space was reduced to 51, 21, 7 days and 54 hours, respectively. Lead reduced live - space of larvae to 26 days already at the low concentration of 10 ppm and in all higher concentrations (20, 50 and 200 ppm) their survival changed unsignificantly (to 22 days). In solution of Cd, contaminated with 0.1 and 0.3 ppm larvae died after 39 and 17 days, respectively, white at higher concentrations of this toxin (3 and 10 ppm) larvae survived only 54 and 30 hours, respectively.
    Źródło:
    Annals of Parasitology; 1997, 43, 1
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Survival of larvae of Nippostrongylus brasiliensis [Nematoda] in solutions of toxic substances
    PRZEŻYWALNOŚĆ LARW NIPPOSTRONGYLUS BRASILIENSIS (NEMATODA) W ROZTWORACH SUBSTANCJI TOKSYCZNYCH
    Autorzy:
    Gadomska, K.
    Zakrzewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2148897.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    toxic substance
    Nematoda
    lead
    cadmium solution
    copper solution
    Nippostrongylus brasiliensis
    environment pollution
    cadmium
    zinc
    copper
    larva
    zinc solution
    lead solution
    survival
    Opis:
    The aim of this study was to determine the action of zinc, cooper, lead and cadmium compounds upon N. brasiliensis invasive nematode larvae. The tested larvae were kept in ZnCl2, CuCl2 , Pb(NO3)2 and CdCl2 solutions. The concentrations of toxic substances applied for the study corresponded with level of environmental pollulion. All toxins reduced live - space of larvae. In control group they survived about 69 days. In solutions of the Zn, contaminated with 10, 50, 100 and 200 ppm of toxic substance, they survived 42, 16, 14 days and 72 hours. In solution of Cu, contaminated with 5, 10, 50 and 200 ppm of toxin, live - space was reduced to 51, 21, 7 days and 54 hours, respectively. Lead reduced live - space of larvae to 26 days already at the low concentration of 10 ppm and in all higher concentrations (20, 50 and 200 ppm) their survival changed unsignificantly (to 22 days). In solution of Cd, contaminated with 0.1 and 0.3 ppm larvae died after 39 and 17 days, respectively, white at higher concentrations of this toxin (3 and 10 ppm) larvae survived only 54 and 30 hours, respectively.
    Źródło:
    Wiadomości Parazytologiczne; 1997, 43, 1; 79-88
    0043-5163
    Pojawia się w:
    Wiadomości Parazytologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and analysis of batch extraction process for efficient removal of cadmium and pathogens from aqueous solution using modified plantain peel biochar
    Autorzy:
    Nworie, F. S.
    Oti, W. O.
    Nwali, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193435.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aspergillus
    Biochar
    Candida
    Escherichia coli
    Pseudomonas aeuroginosa
    Staphylococcus aureus
    cadmium (II)
    equilibrium studies
    mass transfer
    pathogens
    Opis:
    Consumption of water contaminated with pathogens and heavy metals is responsible for the demise of millions of people around the globe. To find a low cost, facile and benign route for developing a biosorbent capable of handling the challenges associated with unsafe drinking water, the study report the preparation, activation, adsorption and removal of cadmium and pathogenic organisms from water samples. Modified plantain peel biochar (MPPB) was characterized using Braunauer-Emmett-Teller (BET) surface area and X-Ray diffraction (XRD). Surface area and pore size of the MPPB determined from BET surface area plot are 8.79 cc/g and 16.69 m2/g respectively with XRD crystallite size of 14.56 nm. The maximum adsorption capacity was observed to be 366.300 mmolkg-1. Equilibrium isotherm indicated the coefficient of determination to increase from Jovanovich →Elovic→Temkin→Freundlich→Langmuir model. Surface interaction and mass transfer kinetics shows a mixture of intra-particle diffusion and mass transfer process. The adsorption kinetics and surface interaction models coefficient of determination increased from Bangham pore diffusion →mass transfer model→Liquid film diffusion→pseudo first order→Dunwald-Wagner→Elovic→Pseudo-second order→Weber and Moris model. The adsorption indicated a chemisorption process with rate limitimg step likely to involve electron pair donor-acceptor interactions, hydrogen bonding and dipole dipole interactions. Antimicrobial evaluation of MPPB showed that it is a potential antimicrobial agent against common micro-organisms.
    Źródło:
    World Scientific News; 2021, 157; 1-24
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractional composition of humic compounds and the capacity to bind cadmium ions from the solution by biologically and thermally processed Miscanthus giganteus biomass
    Skład frakcyjny związków humusowych oraz zdolności wiązania jonów kadmu z roztworu przez biomasę Miscanthus giganteus przekształconą biologicznie i termicznie
    Autorzy:
    Gondek, K.
    Mierzwa-Hersztek, M.
    Kopec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/36088.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    fractional composition
    humic compound
    capacity
    bind cadmium ion
    cadmium ion
    Miscanthus x giganteus
    biomass
    compost
    biochar
    cadmium sorption
    Opis:
    The capacity of functional groups of soil organic matter to form organometallic complexes may efficiently reduce the risk of migration of toxic ions of heavy metals in the environment. Therefore, a research was conducted to determine the effect of composting and pyrolysis of Miscanthus giganteus biomass on the quality of humic compounds and on the ability of these materials to bind cadmium ions from the solution. Both processes did not cause any significantly favorable changes in fractional composition of the humic compounds of the transformed Miscanthus giganteus biomass. In the case of the unprocessed and composted biomass, changes in cadmium sorption by the materials used in the research, depending on Cd dose and how long the sample was in contact with the solution, had a similar course, which indicates that the responses taking place directly after the application of the solution that contained Cd ions were stable. In the case of thermal processing of Miscanthus giganteus biomass, it was found that Cd content in the solution decreased with time. Lower cadmium concentrations in the extracts after separation of the biomass were determined in the series with biologically transformed Miscanthus giganteus.
    Zdolność grup funkcyjnych materii organicznej do tworzenia kompleksów metaloorganicznych może wydajnie zmniejszyć ryzyko migracji jonów toksycznych metali ciężkich w środowisku. W związku z tym przeprowadzono badania, których celem było określenie wpływu kompostowania i pirolizy biomasy Miscanthus giganteus na jakość związków humusowych oraz możliwości wiązania jonów kadmu z roztworu przez te materiały. Oba procesy nie spowodowały znacząco korzystnych zmian w składzie frakcyjnym związków humusowych przekształconej biomasy Miscanthus giganteus. Przebieg zmian sorpcji kadmu przez materiały wykorzystane w badaniach, w zależności od dawki Cd i czasu kontaktu próbki z roztworem w przypadku biomasy nieprzetworzonej i przekompostowanej zachodził podobnie świadcząc o stabilnych reakcjach mających miejsce bezpośrednio po aplikacji roztworu zawierającego jony Cd. W przypadku termicznego przekształcenia biomasy Miscanthus giganteus stwierdzono zmniejszanie się zawartości Cd w roztworze wraz z upływem czasu. Mniejsze stężenia kadmu w ekstraktach po oddzieleniu biomasy oznaczono w serii z Miscanthus giganteus przekształconym biologicznie.
    Źródło:
    Acta Agrophysica; 2016, 23, 3
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soil profile as a natural membrane for heavy metals from wastewater
    Autorzy:
    Wlodarczyk, T.
    Witkowska-Walczak, B.
    Majewska, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/24215.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    soil profile
    natural membrane
    heavy metal
    waste water
    zinc
    cadmium
    irrigation
    soil solution
    zinc concentration
    cadmium concentration
    industrial waste water
    toxicity
    Opis:
    The effect of intensive irrigation with wastewater on the zinc (Zn) and cadmium (Cd) concentration in soil solution was investigated. The experiment was parallel conducted on two soil profiles. The soil microcosms were watered with purified wastewater and purified wastewater with an the addition of zinc and cadmium. The results indicate clearly that neither intensive overhead irrigation of the soil nor its flooding with these wastewater and exceeded sorptive capacity. The application of treated wastewater and wastewater with heavy metals addition did not appear to pose a threat to the natural environment. In all the cases under analysis, zinc and cadmium concentrations in the soil solution were several-fold lower than the permissible levels.
    Źródło:
    International Agrophysics; 2012, 26, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ pola ultradźwiękowego na adsorpcję kationów kadmu
    The Effect of Ultrasonic Field on the Adsorption of Cadmium Ions
    Autorzy:
    Lach, J.
    Okoniewska, E.
    Stępniak, L.
    Ociepa, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819171.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    pola ultradźwiękowe
    adsorpcja kationów
    aqueous solution
    activated carbon
    sewage sludge
    metal ions
    removal
    surface
    Opis:
    Adsorption on activated carbon is one of the methods applied for removal of heavy metals from water and wastewater contaminated with these elements. Ion exchange is a predominating mechanism in the process of sorption of ions. In case of sorption of heavy metals cations various surface aggregates are formed. Other processes, such as reduction and oxidation, and precipitation in the pores of insoluble compounds (e.g. hydroxides, carbonates) also occur. The processes behind the formation of aggregates with various degrees of resistance have a particular effect on the selectivity of ion exchange on activated carbons. The chemical composition of activated carbon surface – in particular, the presence of oxygen groups capable of ion exchange – shows the most significant effect during adsorption of heavy metals ions. Typically, the surface of the activated carbons produced with the steam-gaseous method has functional groups both of acidic and alkaline character that are capable of exchanging cations as well as anions. Carbon materials with no functional groups can also sorb protons. This is possible due to the fact that dislocated electrons π in the solutions act as Lewis base. There are a number of methods currently being investigated that would allow for improving the efficiency of adsorption of heavy metals. In the presented work the effect of ultrasonic field on the adsorption of cadmium from the model solutions was analyzed. Various configurations of ultrasonic field applied in the process of adsorption were investigated. Ultrasounds were generated in the UP 400S disintegrator. In the first phase the activated carbon in the form of granules was modified with the ultrasonic field of acoustic power density of 42,5 W/cm2or 85,0 W/cm2, at the amplitude of 30 and 60 µm, and at the exposure time of 5, 10, 15 and 20 min. Modified activated carbons were used for sorption of cadmium ions from the solutions at the initial concentrations ranging from 2,24 do 11,2 mg/dm3. The adsorption of cadmium on the activated carbon modified with ultrasounds (at the amplitude of 30 µm and 60 µm) and at the shortest exposure time (i.e. 5 min.) was higher than on the initial activated carbon. The most favorable results were obtained for the activated carbon modified with ultrasonic field with the acoustic power density of 42,5 W/cm3 and the exposure time of 10 min. The efficiency of cadmium adsorption for the highest concentration increased from 50% (the initial activated carbon) to 63%. Also, the work included the analysis of the effect of ultrasonic field on the cadmium solution with the activated carbon in the form of granules in the first phase of static adsorption. In this case, no significant differences in the adsorption capacities were observed. Also, the effect of ultrasounds on the solution used for the adsorption of cadmium did not have an impact on the efficiency of adsorption. In the final phase of the investigations the effect of sonification on the adsorption of cadmium on the powdery activated carbon was analyzed. The control sample was mechanically mixed for 5 min, and the remaining samples were subjected to the ultrasonic field at various amplitudes but with the same exposure time. The efficiency of adsorption combined with ultrasounds was significantly higher. The final concentrations during the adsorption without ultrasounds were in the range of 0,291 to 1,778 mg/dm3 whereas for the adsorption combined with ultrasounds these concentrations ranged from 0,13 to 0,748 mg/dm3.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2142-2157
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sorption and desorption of copper and cadmium by natural and synthetic zeolites related to the pH of the polymetalic solution
    Autorzy:
    Kozera-Sucharda, B
    Gworek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450118.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    desorption
    pH impact
    natural zeolite
    synthetic zeolite
    pH
    zeolite
    soil
    sorption
    cadmium
    soil property
    copper
    degraded ecosystem
    anthropogenic ecosystem
    Opis:
    The aim of this study was to determine sorption capacity of five zeolite types with reference to copper and cadmium as well as to investigate pH impact on this process. Moreover, the study determined selectiveness of binding and mobilisations by the analysed zeolites as related to the environmental pH changes.
    Źródło:
    Acta Agrophysica; 2001, 51; 237-242
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prevention of Hydrosphere Contamination with Electroplating Solutions through Electromembrane Processes of Regeneration
    Autorzy:
    Serdiuk, Vasyl
    Sklabinskyi, Vsevolod
    Bolshanina, Svetlana
    Ableyev, Alexey
    Dychenko, Tetiana
    Powiązania:
    https://bibliotekanauki.pl/articles/124544.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    electrolysis
    electroplating solution
    cation exchange membrane
    cadmium cation
    zinc cation
    forced mixing
    Opis:
    The work studies the process of Сd2+ and Zn2+ cations transfer through a RALEX®CM-PES 11–66 cation-exchange membrane and the cations reduction as metals on the cathodes at the cathode chambers of the electrochemical units with a view to prevent the hydrosphere contamination with the electroplating solutions. Electrolysis of the solutions that imitated the possible composition of the passivating baths contained 50 g/l sodium dichromate, 10 g/l sulfuric acid and impurity ions of Сd2+ and Zn2+ in various concentrations. The designed passivation solutions with certain amount of impurity ions in the colour solution were forcibly mixed. The impact of the impurity ions concentration in the colour solution and of a forced mixing on the metal reduction was studied. Regularity in the increased metal reduction dependent on the metal concentration was found and the conditions favouring the ion migration through the cation-exchange membrane due to forced mixing were defined.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 4; 61-69
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wiazanie jonow metali przez wybrane frakcje substancji zawartych w wytlokach owocow
    Autorzy:
    Nawirska, A
    Oszmianski, J
    Powiązania:
    https://bibliotekanauki.pl/articles/825999.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    usuwanie jonow metali
    jony olowiu
    wiazanie jonow
    jony miedzi
    roztwory wodne
    jony cynku
    jony kadmu
    polifenole
    pektyny
    jony metali
    wytloki owocowe
    owoce
    metal ion removal
    lead ion
    ion binding
    copper ion
    aqueous solution
    zinc ion
    cadmium ion
    polyphenol
    pectin
    metal ion
    fruit pomace
    fruit
    Opis:
    Celem pracy było określenie możliwości wiązania jonów wybranych metali (Cu2+ , Cd2+ , Pb2+ i Zn2+ )z roztworów wodnych przez frakcje zawarte w wytłokach z owoców aronii, gruszek, jabłek i dzikiej róży. Zbadano, w jakim stopniu analizowane frakcje wytłoków (polifenole, pektyny, hemicelulozy, celulozy i ligniny) wiążą jony poszczególnych metali ciężkich. W tym celu pozbawiono wytłoki kolejnych frakcji, a następnie poddano te wytłoki działaniu roztworów metali o stężeniach w zakresie od 4 do 10 g Me/m3. Stężenia jonów metali w roztworze wyjściowym oraz po 30 minutach kontaktu z wytłokami badano w temperaturze pokojowej przy pH w zakresie od 6,2 do 7,0. Następnie uzyskane wyniki przeliczano na 100 g frakcji. Pektyny były frakcją wiążącą największe ilości jonów miedzi, kadmu i cynku, natomiast polifenole wiązały najwięcej jonów ołowiu, wykazując równocześnie odmienne właściwości w porównaniu z pozostałymi frakcjami. Polifenole zawarte w wytłokach z aronii wiązały wszystkie badane jony, natomiast uzyskane z pozostałych wytłoków - jedynie jony ołowiu. Najgorzej wiążącą frakcją uzyskaną z wytłoków były ligniny. Frakcja celulozy była najbardziej zróżnicowana, wiązała jony metali w różnym stopniu, w zależności od tego, z jakiego rodzaju wytłoków była uzyskana. Otrzymane wyniki mogą być przydatne w komponowaniu mieszanek z wytłoków do usuwania jonów metali z roztworów wodnych.
    The objective of the study was to determine the capacity of chokeberry, pear, apple and rosehip pomace fractions to bind four heavy metal ions of choice (Cu2+, Cd2+, Pb2+ and Zn2+) for their removal from aqueous solutions. The pomace fractions under analysis were polyphenols, pectin, hemicellulose, cellulose and lignin. The pomace samples were subjected to sequential modifications by removing successive fractions and thereafter exposed to heavy metals in solutions which varied in concentration from 4 to 10 g Me/m3. Metal ion concentrations were measured in the starting solution and after 30 minutes of exposure at room temperature and pH from 6.2 to7.0. The results obtained were calculated per 100 g of fraction. Of the fruit pomace fractions examined, pectin was found to bind the greatest amounts of copper, cadmium and zinc ions, whereas polyphenols showed the highest capacity for binding lead ions, and differed in properties from the remaining fractions. The polyphenols fraction of chokeberry pomace was capable of binding all of the investigated metal ions, but the polyphenols fractions of the other pomace types had the capacity to bind lead ions alone. The capacity of the cellulose fraction for heavy metal binding varied from one pomace type to another. The lignin fraction was found to be the least effective metal ion binder. The results of the study may be of utility in selecting the components of a pomace mixture for the removal of heavy metal ions from aqueous solutions.
    Źródło:
    Żywność Nauka Technologia Jakość; 2001, 08, 4; 66-77
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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