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Wyświetlanie 1-15 z 66
Tytuł:
Leaching of heavy metals from monolithic waste
Autorzy:
Mizerna, K.
Król, A.
Powiązania:
https://bibliotekanauki.pl/articles/208246.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
leaching heavy metals
metale ciężkie
wymywanie metali ciężkich
Opis:
Leaching of heavy metals (Zn, Pb, Cu, Ni and Cr) from hazardous waste originating from steel works (slag) has been investigated. Contaminant leaching behavior from monolithic waste materials in the function of time was examined. There was established the cumulative leaching of elements per surface area of waste material and the impact of the duration of the leachant contact with the waste on the leachability. The types of processes accompanying the release of heavy metals were determined as well. Surface wash-off and dissolution were dominant processes during the leaching of the analyzed elements. Chromium was the only element whose release from the sample was controlled by diffusion when subjected to leaching in a liquid of pH 7. Due to the low levels of heavy metal leaching in relation to their concentrations in the samples, it seems that longer duration of the tank test can contribute to the release of additional amounts of the heavy metals.
Źródło:
Environment Protection Engineering; 2018, 44, 4; 143-158
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Beneficiation of oxide ores using dense medium cyclones. A simulation study
Autorzy:
Aghlmandi Harzanagh, A.
Ergun, S. L.
Gulcan, E.
Powiązania:
https://bibliotekanauki.pl/articles/110337.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy medium cyclone
heavy liquid
simulation
iron ores
manganese
chromite
Opis:
Recent investigations of particle behavior and segregation phenomena in a cyclone underline that little is known about particle distribution within a heavy medium separation. For this purpose, density profiles in a heavy medium cyclone (HMC) is measured with techniques such as computational fluid dynamics (CFD) in combination with discrete element modelling (DEM), electrical resistance tomography (ERT), X-ray tomography, particle dynamics analyzer (PDA) etc. Along with these modern efforts of determining the performance of HMC, traditional methods depending on empirical inferences based on experimental data are still important and in progress. The aim of this research was to investigate the possibility of using HMC for the concentration of problematic ores which are not coarsely aggregated. Towards this purpose, current empirical methods were applied to experimental data which were derived from float-sink tests of selected heavy minerals and Fe, Mn, and Cr ore samples. Low density difference between particles made the enrichment difficult using other gravity methods like jigs and shaking tables. After determining physical and mineralogical properties of the samples, appropriate size fractions were prepared for float-sink tests. Combination of sodium polytungstate and tungsten carbide powder were used to prepare non-toxic heavy liquids with density up to 3.5 g/cm3. Using the sink-float test results and existing empirical models for high-density DMC plants simulations were performed. The results of the simulations followed by experimental studies showed that HMCs are applicable to process Fe, Mn, and Cr ores with acceptable grade and recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 379-393
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equilibrium and kinetic studies on the removal of heavy metal ions with natural low-cost adsorbents
Autorzy:
Varank, G.
Demir, A.
Bilgili, M. S.
Top, S.
Sekman, E.
Yazici, S.
Erkan, H. S.
Powiązania:
https://bibliotekanauki.pl/articles/207257.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorbents
adsorption
bentonite
dyes
heavy metals
kinetics
metal ions
water treatment
heavy metal removal
heavy metal ions
heavy metals ions removal
adsorbenty
adsorpcja
bentonit
barwniki
metale ciężkie
kinetyka
jony metali
usuwanie jonów metali ciężkich
uzdatnianie wody
Opis:
Adsorption isotherms and kinetics of the removal of heavy metal ions (Ni, Pb, Zn) from aqueous solutions by natural adsorbents (zeolite, bentonite, clay) were investigated in a lab-scale batch study. The effect of various parameters such as adsorbent dosage, initial concentration of heavy metal ions, temperature, and agitation time were studied to optimise the conditions. Under those optimized conditions (180 rpm agitation rate, 120 min agitation time, pH 4.0, 298 K, 100 mg/dm3 initial adsorbate concentration), the removal percentages of heavy metal ions for natural adsorbents have been determined. The adsorption mechanisms and characteristic parameters of the process were analyzed by two and three parameter isotherm models (Langmuir, Freundlich, Temkin, Redlich-Peterson, Toth and Sips), and kinetic models (Lagergren's pseudo-first order, Ho and McKay's pseudo-second order). Adsorption thermodynamics of heavy metal ions (changes of standard enthalpy, entropy and free energy) on zeolite, bentonite and clay were also studied at 298,318 and 338 K.
Źródło:
Environment Protection Engineering; 2014, 40, 3; 43-61
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the content of trace elements in the aerial and underground biomass of perennial grasses of the genus Miscanthus
Autorzy:
Stypczyńska, Z.
Dziamski, A.
Jaworska, H.
Dąbkowska-Naskręt, H.
Powiązania:
https://bibliotekanauki.pl/articles/207911.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Miscanthus
heavy metals
biochemistry
Miskant
metale ciężkie
biochemia
Opis:
The content of lead, zinc, copper, nickel and chromium in the aerial and underground parts of M. sinensis from eleven years old plantation and M. sacchariflorus and M. giganteus from nine years old plantations were analysed in order to recognize what organs of the plant play the most important function as a metal accumulator. It was found that in the aboveground parts, lead, zinc and copper were accumulated mostly in leaves and nickel and chromium in stems of the studied species. In underground plant parts, especially in roots, zinc, copper and nickel were most abundantly accumulated, while rhizomes accumulated higher amounts of lead and chromium. The content of lead, zinc and copper was definitely lower in those plant organs than their content in soil. The content of nickel and chromium, on the other hand, showed the opposite dependence. A similar capacity for uptaking trace elements from soil was observed for M. sacchariflorus and M. giganteus, while M. sinensis it was much lower, which is confirmed by the values of the bioaccumulation factors. The translocation factor for trace metals in the studied grass species indicated great translocation of lead and nickel from the roots to rhizomes, and that of zinc to aboveground parts.
Źródło:
Environment Protection Engineering; 2018, 44, 3; 141-151
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modified bentonite mineral as a sorbent for $Pb^{2+}$ and $Zn^{2+}$ ions removal from aqueous solutions
Autorzy:
Selim, K.haled A.
Rostom, Merit
Youssef, Mohhamed A.
Abdel-Khalek, Nagui A.
Abdel-Khalek, Mohhamed A.
Hassan, El-Sayed R. E.
Powiązania:
https://bibliotekanauki.pl/articles/1450133.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Ca-montmorillonite
adsorption
heavy metals
surface modification
rheology
Opis:
Environmental pollution by lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions has become an important issue due to its harmful effects on human health and environment. This work aims to evaluate the application of surface modified Egyptian bentonite mineral by acid activation using $H_2SO_4$ and thermal treatment as an adsorbent to remove lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions from aqueous solution. X-ray diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) techniques were used to investigate the modified bentonite. The impact of organic and inorganic dispersants on rheological characteristics of bentonite suspensions was investigated. Adsorption of $Pb^{2+}$ and $Zn^{2+}$ ions using modified bentonite mineral was performed with different adsorbent doses and pH values. Removal efficiencies of lead and zinc are 99.67% and 99%, respectively with adsorbent dose of 25 g/l at pH of 6.2.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 145-157
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
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
Tytuł:
From waste to treat waste : exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater
Autorzy:
Attia, H.A.
Farghaly, Mohamed G.
Saleh, A.M.
Abdel Khalek, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/2175448.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
marble dust
pollutant
adsorbent
dye
heavy metals
textile wastewater
Opis:
The marble dust as a harmful industrial waste of marble fabrication was evaluated as aneconomical and efficient green adsorbent for Acid Red-1 dye and lead ions. The XRD, XRF, particle size, surface area and zeta-potential measurements were used to characterize the marble dust. The removal efficiency was optimized by studying several parameters such as pH, temperature, contact time, adsorbent dose and initial concentration. The optimum removal was achieved at pH 6, 20°C after 60 min in the presence of 2.5g/L marble dust. The rates of adsorption were found to follow the pseudo-second-order model. The results showed better fitting to Freundlich isotherm. The thermodynamic studies revealed that the adsorption process is spontaneous, exothermic and favorable at low temperature. The free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) changes were calculated to predict the nature of adsorption.The removal efficiency was improved by calcination of the marble at 700°C. Application for textilewastewater showed high removal efficiency up to 99.9%of inorganic and organic pollutants. The product of treatment was used in the concrete and bricks manufactured, so there is nogeneration of second-order pollutants.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 154007
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytotoxicity and extractability of heavy metals from industrial wastes
Autorzy:
Baran, A.
Antonkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/207036.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phytotoxicity
industrial waste
heavy metal
metale ciężkie
odpady przemysłowe
fitotoksyczność
Opis:
The content, mobility and phytotoxicity of heavy metals in industrial wastes (sewage sludge, car-bide residue, flotation tailings) have been determined by chemical characterization and biological test. Assessment of phytotoxicity and content of heavy metals in industrial wastes is important for screening the suitability for their land application or storage. The obtained information may provide a better understanding of environmental risks of heavy metals in wastes. Waste phytotoxicity was arranged in the following order: municipal sewage sludge > industrial sewage sludge > carbide residue > flotation tailings from Żelazny Most > flotation tailings from Gilów. High toxicity of sewage sludge can be caused by a high total content of metals and their forms soluble in 1 M HCl. As a result of waste acidification, zinc, chromium, nickel, and cadmium will be released into the environment from sewage sludge, whereas copper and lead will be released from flotation tailings. The study showed a strongly positive correlation between the content of Zn, Ni, Cr, Cd in waste and root growth and seed germination inhibition.
Źródło:
Environment Protection Engineering; 2017, 43, 2; 143-155
0324-8828
Pojawia się w:
Environment Protection Engineering
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:
Zinc(II) removal from model chloride and chloride–nitrate(V) solutions using various sorbents
Autorzy:
Wołowicz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/109382.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
zinc
removal
ion exchanger
Lewatit MonoPlus TP220
Opis:
Zinc(II) complexes removal from aqueous chloride and chloride-nitrate(V) solutions was realized using different type of sorbents such as an ion exchangers of the chelating type (Lewatit MonoPlus TP220, Purolite S984), strongly basic (Lewatit MonoPlus SR7, Purolite A400TL, Dowex PSR2, Dowex PSR3) and weakly basic (Purolite A830) anion exchangers as well as the adsorbent resin Lewatit AF5. The kinetic and equilibrium studies using the static method were carried out in order to examine the rate of zinc(II) removal as well as to obtain the maximum adsorption capacities. The obtained experimental data were analyzed by means of different kinetic and isotherm models as well as the corresponding parameters were calculated. The desorption and reuse studies (three cycles of sorption/desorption) were also discussed. Lewatit MonoPlus TP220 showed the highest efficiency of zinc(II) removal and the maximum sorption capacity was equal to 620 mg/g. The kinetics of zinc(II) sorption is well described by the pseudo-second order kinetic model. The interactions between the sorbent and zinc ions are strong because no quantitative zinc desorption was observed (40% using nitric(V) and sulfuric(VI) acids for Lewatit MonoPlus TP220).
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1517-1534
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of Co(II) and Ni(II) ions removal from wastewater using artificial neural network and multiple regression models
Autorzy:
Allahkarami, E.
Igder, A.
Fazlavi, A.
Rezai, B.
Powiązania:
https://bibliotekanauki.pl/articles/109455.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
artificial neural network
nonlinear multi-variable regression
heavy metals
adsorption
Opis:
In this research, carboxymethyl chitosan-bounded Fe3O4 nanoparticles were synthesized and used for removal of Co(II) and Ni(II) ion metals from wastewater. The capability of magnetic nanoparticles for metal ions removal was investigated under different conditions namely pH, initial concentration of metal ions and adsorbent mass. The assessment of adsorbent performance for metal ions removal under different conditions requires cost and time spending. In this regard, the capability of artificial neural network (ANN) and nonlinear multi-variable regression (MNLR) models were investigated for predicting metal ions removal. The values of operational parameters such as pH, contact time, initial concentration of metal ions and adsorbent mass were applied for simulation by means of ANN and MNLR. A back propagation feed forward neural network, with one hidden layer (4:8:2), was proposed. Two criteria, including mean square error (MSE) and coefficient of determination (R2) were used to evaluate the performance of models. The results showed that two models satisfactorily predicted the adsorbed amount of metal ions from wastewater. However, the ANN model with higher R2 and lower MSE than the MNLR model had better performance for predicting the adsorbed amount of metal ions from wastewater.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1105-1118
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on heavy metals mobility from zinc plant residues in Iran
Autorzy:
Moradkhani, D.
Eskandari, S.
Sedaghat, B.
Najafabadi, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/110826.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
zinc leaching plant
leaching filter cake
column leaching
Opis:
The transport of heavy metals from mining disposal site to groundwater and surface water is one of the most serious environmental problems in the world. The transport of heavy metals such as Zn, Cd and Mn from leaching filter cake in RECo, Zanjan, Iran was examined by using column leaching. Parameters studied included: flow rate, pH of input solution and leaching time. In this study, the maximum dissolution percents of Zn, Cd and Mn in input solution pH of 5 were 45.50 %, 53.97% and 19.94%, respectively. To statistically analysis the experimental results, SPSS14 software was employed. The results of SPSS 14 indicated that for the Zn, Cd and Mn dissolution, time and flow rate were found respectively, the effective parameters for the pollution in zinc leach residues.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 567-574
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion flotation and its applications on concentration, recovery, and removal of metal ions from solutions
Autorzy:
Arslan, Fatma
Bulut, Gülay
Powiązania:
https://bibliotekanauki.pl/articles/2146933.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ion flotation
heavy metals
rare earth metals
waste water
preconcentration
Opis:
Many industries, especially mining and metallurgy, deal with solutions containing ions. In some cases, these metal ions need to be concentrated and recovered from solutions and sometimes removed from wastewater. The ion flotation method has been applied for wastewater and water treatment, recovery of precious and platinum group metals, preconcentrating of rare earth elements, selective separation of multicomponent ions from dilute solutions, and analytical chemistry. It has been employed to separate heavy metals from a liquid phase using bubble attachment, originated in mineral processing. In these cases, ion flotation has an important place among other methods because it is a cheap and practical method. In this study, many ion flotation studies, especially applied at laboratory scale, were reviewed. This method gives very successful and promising results in removing heavy metals with toxic effects from wastewater and selective separation of metal ions from very low concentrated solutions. Ion flotation may take place in industrial scale operations with the new developments in flotation machines and collectors with better selectivity, high efficiency, lower cost, and environmental friendliness.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152061
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physiological responses of nonmetallicolous and serpentine Silene vulgaris ecotypes cultivated in different soils
Autorzy:
Koszelnik-Leszek, Anna
Bielecki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2032863.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Silene vulgaris
ecotype
heavy metals
soil
ekotyp
metale ciężkie
gleba
Opis:
Silene vulgaris ecotypes Wiry and Gajków, originating from a serpentine heap and a natural site, respectively, were cultivated from seeds on two substrates. The former was a serpentine heap located in Wiry (Poland, Lower Silesia), the latter – natural soil located in Gajków (Poland, Lower Silesia). The growth of both ecotypes on the Wiry soil was strongly inhibited. The Wiry ecotype grown on the serpentine heap accumulated more macro-, micro-nutrients and heavy metals (Ni, Co, Cr) than ecotype Gajków. Enzyme pyrogallol peroxidase was more active in the leaves of the Wiry ecotype grown only on Wiry soil. Ecotype Gajków, grown on the serpentine heap, was characterized by higher non-protein thiol, total polyphenol and anthocyanin content. The results obtained in the study indicated heterogeneous responses between ecotypes, depending on the applied substrate, while parallel studies of tolerant and sensitive populations made possible the study of the taxon’s tolerance mechanisms to heavy metals.
Źródło:
Environment Protection Engineering; 2021, 47, 3; 5-16
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and ecological risk assessment of heavy metals in roadside soil along the Hemat highway of Tehran, Iran
Autorzy:
Movafagh, A.
Mansouri, N.
Moattar, F.
Vafaeinejad, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/207728.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heavy metals
contamination
wetlands
highway
metale ciężkie
autostrada
grunty przydrożne
Opis:
The impact of land use and a distance from the highway on heavy metal concentration in soils along the highway has been investigated. 28 soil samples were collected in August 2014 from the roadside soils of the Hemmat highway of Tehran, Iran. The results showed that the mean concentrations of Pb, Cr, Ni, Zn and Cd were 144, 17.20, 18.91, 86.84, 3.86 mg/kg–1, respectively. With exception for Cd, the concentrations of the heavy metals decreased upon increasing distance from the highway that shows the background amount of cadmium in the soil area was high. The values of the enrichment factor (EF) showed that Ni, Zn and Cr have a natural source (EF < 10) and Pb and Cd have an anthropogenic source (EF > 10). The anthropogenic sources are emphasized for these heavy metals, thus indicating the strong human influence. The mean values of geoaccumulation index (Igeo) for Pb, Zn, Cd were high at residential, under-construction and green space land uses. The ecological risk index (RI) for roadside soils was higher than 300, indicating that sampling sites had a considerable ecological risk. The potential ecological risk index for single metal decreases in the following sequence: Cd > Pb > Ni > Zn > Cr.
Źródło:
Environment Protection Engineering; 2018, 44, 3; 5-17
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 66

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