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    Wyświetlanie 1-14 z 14
    Tytuł:
    Investigation and elimination of surfactant-induced interferences in anodic stripping voltammetry for the determination of trace amounts of cadmium
    Autorzy:
    Grabarczyk, Malgorzata
    Wardak, Cecylia
    Wawruch, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/24085686.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cadmium
    stripping voltammetry
    surfactants
    Amberlite resins
    Opis:
    This article aims to investigate in detail to what extent surfactants affect the determination of cadmium by anodic stripping voltammetry. In recent years, the production and use of surfactants have been steadily increasing, so that their concentration in environmental water samples is rising. At the same time, it is known that organic compounds, such as surfactants, often hinder the voltammetric determination of trace elements by stripping. Non-ionic (Triton X-100, Brij 35, Tween 20, Tween 60, Tween 80), cationic (CTAB, CTAC, DTAB, HPC) and anionic (DSS, SDS) compounds were selected to investigate the effect of surfactants on the voltammetric signal of cadmium. At the same time, the extent to which the addition of Amberlite resins to the analysed solution eliminates the interfering effect of surfactants was tested. Three types of Amberlite resins XAD-2, XAD-7 and XAD-16 were selected for the study and the ratio of resin weight to solution volume was determined. Finally, the determination of cadmium in surfactant-enriched environmental samples was carried out. The recoveries obtained between 95.5 and 107%, with RSD between 3.4 and 6.2%, confirm the validity and correctness of the proposed procedure All measurements were carried out by anodic stripping voltammetry using a CNTs/SGC electrode modified with a bismuth film as the working electrode.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 170717
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetic studies on sorption of ni(ii) and cd(ii) from chloride solutions using selected acidic cation exchangers
    Autorzy:
    Otrembska, P.
    Gega, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/110403.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sorption
    nickel
    cadmium
    adsorption kinetics
    adsorption isotherm
    Opis:
    Sorption of nickel(II) and cadmium(II) ions from chloride solutions was tested. Three different strongly acidic cation exchangers, i.e. Lewatit MonoPlus SP 112, Amberlite 200C and Amberlyst 15, were used. Effects of phase contact time, pH and initial concentration of metal ions on equilibrium and kinetics of sorption by batch methods were studied. It was showed that sorption of Ni(II) and Cd(II) could be described by the pseudo-second order equation. Experimental results data were analyzed using the Langmuir and Freundlich isotherms. Sorption of Ni(II) and Cd(II) onto investigated resins followed the Langmuir isotherm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 1; 301-312
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of hydrothermal modification of titanium phosphate on the adsorption affinity towards cadmium ions
    Autorzy:
    Janusz, Władysław
    Khalameida, Svietlana
    Skwarek, Ewa
    Sydorchuk, Vladimir
    Charmas, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/110216.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium phosphate
    FTIR-ATR
    hydrothermal treatment
    adsorption
    cadmium ions
    Opis:
    The effect of hydrothermal treatment of the gel or xerogel oftitanium phosphate (TiP) sample on the surface properties was studied usingthe EDS and FTIR ATR methods. The results show that the hydrothermal treatment of initial titanium phosphate decreases the amount of physically adsorbed water but increases the surface concentration of phosphate groups. Supplementary measurements of electrokinetic properties of modified and hydrothermally modified titanium phosphate samples confirmed an increase of the concentration of acidic groups on theTiP surface. The adsorption affinity of titanium phosphate towards cadmium ions was discussed. It was found that at a low initial concentration of cadmium ions adsorption affinity increases as a resultof hydrothermal treatment of TiP gel.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1568-1576
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lead(II) removal from aqueous solutions by solvent extraction with tetracarboxylresorcin[4]arene
    Autorzy:
    Konczyk, J.
    Kozlowski, C.
    Walkowiak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/110670.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    solvent extraction
    lead(II)
    zinc(II)
    cadmium(II)
    resorcinarene
    Opis:
    A novel tetracarboxylresorcin[4]arene was synthesized and its selective complexing ability towards Pb(II) ions was examined. The influence of several parameters such as pH of aqueous phase, agitation time, extractant and modifier concentrations on solvent extraction of Pb(II) ions from the aque-ous nitrate phase into chloroform organic phase was studied. The stoichiometry of the formed metal-ligand complexes was established by slope analysis. Pb(II) ions were quantitatively extracted in the form of 2:1 Pb(II)-resorcin[4]arene complex from aqueous solutions of pH 5.5 to the solution of ligand in chloroform. Competitive solvent extraction experiments in the presence of Zn(II) and Cd(II) ions were also carried out and high selectivity of the extractant towards Pb(II) over Zn(II) and Cd(II) was found. The selectivity order was: Pb(II) >> Cd(II) > Zn(II).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 1; 213-222
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sorption of Cd(II), Ni(II) and Zn(II) on natural, sodium-, and acid-modified clinoptilolite-rich tuff
    Autorzy:
    Abatal, M.
    Olguin, M. T.
    Abdellaoui, Y.
    El Bouari, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208078.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    heavy metals
    clinoptilolite
    cadmium removal
    metale ciężkie
    klinoptylolit
    usuwanie kadmu
    Opis:
    Sorption of Cd2+, Ni2+and Zn2+ions on natural (ZPCli), sodium modified (ZPCliNa) and acid modified (ZPCliH) zeolites have been investigated in function of the contact time, pH, and metal concentration by the batch technique. The characterization of ZPCIi, ZPCliNa, and ZPCliH materials was performed using X-ray powder diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy techniques. The surface area (BET) and the pHpzcwere also determined. The pH in the point of the zero charge of ZPCli, ZPCliNa, and ZPCliH zeolites was 8.25, 8.00, and 2.05, respectively. The kinetic sorption data for ZPCli, ZPCliNa and ZPCliH were well fitted to the pseudo-second order model (R2> 0.99). The linear model described the Cd, Ni and Zn sorption isotherms for ZPCliH, while for ZPCliNa and ZPCliH it was the Freundlich model. The unmodified and modified zeolitic materials showed the highest sorption capacity for Cd2+, lower for Zn2+ and Ni2+.
    Źródło:
    Environment Protection Engineering; 2018, 44, 1; 41-59
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction properties of tetraheptylresorcin[4]arenes in relation to Cr(III) ions
    Autorzy:
    Konczyk, J.
    Miroshnychenko, S.
    Kozlowski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/109751.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    solvent extraction
    resorcin[4]arenes
    chromium(III)
    cadmium(II)
    zinc ions
    Opis:
    Resorcin[4]arene-based ligand bearing four heptyl chains at the lower rim of the molecule was prepared and modified by four tetradietoxyphosphoryl groups in the upper rim. The compounds obtained were characterized by NMR spectroscopy and their extractability toward chromium(III) ions was studied. The influence of process parameters such as the pH of aqueous phase, agitation time and also extractant’s structure and concentration on efficiency of Cr(III) ions solvent extraction is presented. The highest yield of Cr(III) solvent extraction was obtained for two-hour agitation time of 5.010−4 M metal solution of pH 5.0 and 5.010−3 M chloroform solution of the tetradietoxyphosphorylated derivative of heptyl-resorcin[4]arene. Under optimal conditions, competitive solvent extraction of Cr(III), Zn(II), and Cd(II) ions was performed and separation factor values were established as 77.0 and 24.9 for Cr(III)/Cd(II) and Cr(III)/Zn(II) ions pairs, respectively. The stoichiometry of formed metal-ligand complexes 1:1 was found by classical slope analysis method.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 835-844
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of selective retention of Cd-Ni ions from aqueous solutions by polymer enhanced ultrafiltration
    Autorzy:
    Can, Muhammed F.
    Arslan, Fatma
    Çelik, Mehmet S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146925.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cadmium
    nickel
    polymer enhanced ultrafiltration
    polyethylenimine (PEI)
    selective heavy metal ion retention
    Opis:
    Polymer enhanced ultrafiltration (PEUF) technique economically enables separation and/or retention of various heavy metal ions from aqueous solutions for environmental and engineering problems. Polyethylenimine as the water-soluble complexation agent utilized to interact with heavy metal ions of Cd and Ni as cations in ultrafiltration experiments were modeled with protonation data to understand the mechanism. Test runs showed that an enrichment coefficient (the ratio of Cd over Ni in permeate) up to 10 was obtained at pH 4.2 in the temperature range of 20-22oC, whereas full retention of both cations is possible above pH 5.0 and those results are highly compatible with the model developed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 151913
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sorption kinetics of Cd(II) ions on fermented grape marc
    Autorzy:
    Grudić, V.
    Bošković, I.
    Jaćimović, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/207276.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    activated carbon
    cadmium compounds
    kinetic parameters
    Weber-Morris model
    węgiel aktywny
    związki kadmu
    parametry kinetyczne
    model Webera-Morrisona
    Opis:
    The sorption kinetics of Cd(II) ions on the biosorbent which is waste in wine production has been investigated. The sorption process took place relatively quickly, enabling one to achieve equilibrium within a period of 15–20 min only, depending on initial concentration of the sorbate. Kinetic models of pseudo-first and pseudo-second order, model of diffusion in a fluid film and Weber’s and Morris’ intraparticle diffusion model were used to describe the experimental results. The pseudo-second order kinetic model described the sorption process with a high correlation coefficient (R2 = 0.998) better than the other kinetic models. The mass transfer coefficient decreases upon increasing the initial concentration of the solution, which can be explained by the fact that the mechanism of binding of Cd(II) ions to the surface of the sorbent is ion exchange followed by discharge of exchangeable cations from the surface. Characteristic constants in the Weber–Morris model increase upon increasing the initial concentration of the solution.
    Źródło:
    Environment Protection Engineering; 2017, 43, 4; 243-252
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of chromium(VI) from wastewater through ion exchange. Kinetic and scale up studies
    Autorzy:
    Ahmad, Syed Waqas
    Zafar, Muhammad Shahzad
    Ahmad, Sajjad
    Zia-Ul-Haq, M.
    Ashraf, Muhammad
    Rabbani, Javed
    Ullah, Sami
    Powiązania:
    https://bibliotekanauki.pl/articles/208034.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ion exchange
    industrial wastewater
    anion resin
    heavy metals
    cadmium
    wymiana jonowa
    ścieki przemysłowe
    żywica anionowa
    metale ciężkie
    kadm
    Opis:
    Chromium(VI) ions were removed from industrial wastewater. In this regard, a rig was fabricated carrying alkaline anion resin. Various experiments were carried out by varying pH, temperature and volumetric flow rate of solution by employing a rig to study the kinetics of the ion exchange process. The rate constant (k) and maximum solid phase concentration of exchanged solute (q0) were calculated using the Thomson equation to scale up the purification process of industrial runoff of chromium(VI) from the tanning, photography and ceramic industry. Experimental optimization revealed that developed setup will remove chromium(VI) to a level of 5 mg/dm3 from 300 mg/dm3 in 40 000 dm3 of wastewater. To achieve the best results for the flow rate of 10 000 3 3/day, 12.03 kg of anionic resin were recommended by fixing the pH of the setup at 7.4 while maintaining the treatment temperature at 20 °C.
    Źródło:
    Environment Protection Engineering; 2019, 45, 1; 17-29
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of organic waste for adsorption of Zn(II) and Cd(II) ions
    Autorzy:
    Bakalár, Tomáš
    Pavolová, Henrieta
    Powiązania:
    https://bibliotekanauki.pl/articles/208191.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cadmium
    zinc
    hazelnut
    orange peel
    heavy metals
    Freundlich isotherm
    kadm
    cynk
    orzech laskowy
    skórka pomarańczowa
    metale ciężkie
    Izoterma Freundlicha
    Opis:
    Biosorption of Zn(II) and Cd(II) ions from aqueous solutions onto organic waste – orange peel, hazelnut shell, and walnut shell was studied using batch adsorption experiments. In the biosorption studies, equilibrium metal ion concentration was determined. Experimental data obtained were analysed in terms of Freundlich, Langmuir, Temkin, Dubinin–Radushkevich, Redlich–Peterson, Sips, Toth, and Khan isotherms. The results of the study showed that orange peel, hazelnut shell, and walnut shell can be adequately used as low-cost alternatives for the removal of Zn(II) and Cd(II) ions from aqueous solutions with maximum sorption capacities of 15.51 and 19.8 mg/g, 11.55 and 16.65 mg/g, and 26.60 and 21.10 mg/g, respectively. The highest removal efficiency of Zn(II) and Cd(II) ions was obtained for hazelnut shells. The process was fast and about 90% of metal ions were removed by all the studied biosorbents. The sorption process was possibly chemisorption occurring on a heterogeneous surface.
    Źródło:
    Environment Protection Engineering; 2019, 45, 2; 35-54
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Release of heavy metals from waste into leachate in active solid waste landfill
    Autorzy:
    Talalaj, I. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/206952.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    copper
    cadmium
    carbonates
    heavy metals
    Pb concentration
    landfill
    leachate treatment
    leaching
    lead
    zinc
    solid waste landfill
    miedź
    kadm
    węglany
    metale ciężkie
    składowisko
    ługowanie
    ołów
    cynk
    stężenie ołowiu
    wysypisko odpadów stałych
    Opis:
    Mass balance of selected heavy metals (Cu, Cr, Pb, Hg, Zn, Cd) released from waste into leachate during 8 years of landfill exploitation has been calculated. The average release of all analyzed heavy metals did not exceed 1.7%. Heavy metals released in the largest quantities were Cr (0.025 –1.685%), Hg (0.033–1.540%) and Cd (0.082–0.701%). Release of Pb, Cu, Zn was 0.008–0.152%; 0.012–0.085% and 0.007–0.152%, respectively. Cr and Hg do not form an insoluble sulfide precipitate and that is why they are released in a larger amount. Cd and Pb concentrations are positively correlated with the amount of the atmospheric precipitation and the amount of leachates, which means that infiltrating rainfall can leach out these metals from waste. Favorable conditions for leaching of these metals are probably a result of their precipitation as carbonates. A strong correlation between Cu, Zn, and Cr indicates they do not precipitate as carbonates and further they can be subject to desorption processes. In the case of Cu, Zn, Cr and Hg, a positive correlation with the amount of deposited waste was also observed.
    Źródło:
    Environment Protection Engineering; 2015, 41, 1; 83-93
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of fertilization with sewage sludge and sewage sludge-based mixtures of heavy metals mobility
    Autorzy:
    Ociepa, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/207987.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sewage sludge
    cadmium
    coal ash
    fertilizers
    lead
    lignite
    potassium
    soil pollution
    zinc
    bioavailable metals
    plant biomass
    osady ściekowe
    kadm
    popiół węglowy
    nawozy
    ołów
    węgiel brunatny
    potas
    zanieczyszczenie gleby
    cynk
    metale biodostępne
    biomasa roślin
    Opis:
    The presented work aimed at evaluating a fertilizing mixture of sewage sludge, brown coal and brown coal ash enriched with potassium mineral fertilizer on mobility of heavy metals. The effects of fertilization were compared with the effects obtained from fertilization with: sewage sludge, mixture of sewage sludge and mineral fertilizer, mixture of brown coal and mineral fertilizers and mineral fertilizers. Soil was slightly contaminated with zinc and cadmium (II°) and showed elevated concentration of lead (I°). The uptake of heavy metals by plants depended on the concentration of bioavailable metal forms determined with 0.01 M CaCl2 and 1 M HC1. Fertilization with the mixture of sewage sludge, brown coal, brown coal ash enriched with potassium mineral fertilizer resulted in the reduction in the concentrations of zinc by 30-38%, cadmium by 28-34% and lead by 11-50% in plant biomass compared to soil with no fertilization.
    Źródło:
    Environment Protection Engineering; 2013, 39, 2; 55-66
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractions of heavy metals in residue after incineration of sewage sludge
    Autorzy:
    Dąbrowska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/208152.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    heavy metals
    copper
    cadmium
    lead
    nickel
    sewage sludge
    waste incineration
    wastewater treatment
    zinc
    zinc sulfide
    environment protection
    heavy metal accumulations
    metale ciężkie
    miedź
    kadm
    ołów
    nikiel
    osady ściekowe
    spalanie odpadów
    oczyszczanie ścieków
    cynk
    siarczek cynku
    ochrona środowiska
    akumulacja metali ciężkich
    Opis:
    Comparative evaluation of metal occurrence was conducted for sludge originating from three wastewater treatment plants, which differ in wastewater treatment methods, processing and drying of sludge. It was demonstrated that metals (Zn, Cu, Ni, Pb, Cd, Cr) in sludge are mainly bound to organic-sulfide fraction. Zinc was also present in significant amounts in hydrated iron and manganese oxide fraction, nickel and cadmium in exchangeable-carbonate fraction, whereas lead in residue fraction. In ash obtained after calcination at 600 °C occurred mainly metal enriched nearly insoluble compound fraction (residual fraction). Metal accumulation in such non-mobile fraction is advantageous with respect to soil-water environment protection.
    Źródło:
    Environment Protection Engineering; 2013, 39, 2; 105-113
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of sewage sludge on the accumulation of heavy metals in soil and in mixtures of lawn grasses
    Autorzy:
    Wołejko, E.
    Wydro, U.
    Butarewicz, A.
    Łoboda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/207415.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soil pollution
    cadmium
    copper
    lead
    nickel
    sewage sludge
    zinc
    heavy metal accumulations
    Zn content
    grass
    heavy metal contamination
    heavy metal pollution
    soil contaminated with heavy metals
    zanieczyszczenie gleby
    kadm
    miedź
    ołów
    nikiel
    osady ściekowe
    cynk
    metale ciężkie w glebach
    zawartość Zn
    trawa
    kumulacja metali ciężkich
    zawartość cynku
    Opis:
    The study was conducted on three specially prepared test areas along main streets of Bialystok. The experimental plots were sown with two lawn grass mixtures: Eko and Roadside, and three doses of sewage sludge 0.0 (control), 7.5 kg/m2 and 15.0 kg/m2 were used. The calculated bioconcentration factor made possible to determine the mobility of the various metals from the soil solution to the aerial parts of plants. The obtained results showed that the plants absorbed Cd, Zn, Cu easier than Pb and Ni suggesting a high mobility, in particular of Cd, Zn, Cu, and reflects the easiness extraction of those metals by plants. Significant correlations between concentrations of metals in soil and grass were observed, nickel in soil was significantly correlated with Cd, Zn and Cu in plants, while the Zn content in soil with the level of Cu in plants.
    Źródło:
    Environment Protection Engineering; 2013, 39, 2; 67-76
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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