Search results for " Metals"
showing 10 items of 462 documents
Biokumulacja pierwiastków w grzybach wielkoowocnikowych - przegląd wybranej literatury
2017
Celem pracy było dokonanie analizy bibliometrycznej wybranych publikacji dotyczących akumulacji pierwiastków w grzybach wielkoowocnikowych (ektomikoryzowych i saprofitycznych) występujących na terenie Europy. Analizie poddano wybrane publikacje z lat 2001-2016 dostępne poprzez serwisy, np.: Springer, Science Direct i Web of Science. Przeanalizowano m.in. akumulowane mikro- i makropierwiastki, miejsca prowadzenia badań oraz typ badań (m.in. badania in situ, badania laboratoryjne). W wyniku przeprowadzonych badań literaturowych stwierdzono, że temat translokacji pierwiastków do grzybów wielkoowocnikowych jest nadal aktualny i cieszy się dużym zainteresowaniem naukowców z wielu krajów europejs…
Narażenie na zanieczyszczenia zawarte w pyłach PM10 i PM2,5 drogami wchłaniania: inhalacyjną, dermalną i pokarmową
2022
W artykule zaprezentowano wyniki pomiarów stężeń pyłu PM10 w powietrzu atmosferycznym wraz z zawartymi metalami ciężkimi (arsenem, kadmem, niklem i ołowiem). Przeanalizowano dane z okresu 2016-2020 dla ośmiu stacji monitoringu jakości powietrza zlokalizowanych w województwie śląskim. Wyniki pomiarów dotyczyły stężeń średniorocznych uzyskanych z rejestru Głównego Inspektoratu Ochrony Środowiska. Najwyższe stężenia pyłu PM10 odnotowano w latach 2016 i 2017, sięgały one 160 μg/m3 przekraczając tym samym wartość dopuszczalną (40 μg/m3) prawie 4-krotnie. Spośród przeanalizowanych metali, dla arsenu w roku 2016 zaobserwowano przekroczenia wartości dopuszczalnej, która wynosi 6 ng/m3. Spośród sied…
Benthic foraminifera assemblages in coastal marine ecosystem and relationship with metal distribution. A spatial study along Sicilian coasts.
2007
Efficiency of biochar for reducing mobility of inorganic contaminants
2013
Anthropogenic activities have produced numerous sites with extensive contamination close to residential areas. Several physicochemical and biological remediation methods exist for remediation of metal contaminated soils and lands, such as soil washing, soil flushing, phytoremediation, and electrokinetics. Biochar (biologically derived charcoal) is produced by pyrolysis of biomasses under low oxygen conditions, and it can be applied for recycling organic waste in soils. The main objectives of the present study were to determine the possible use of biochar from forest ersidues (Populus nigra) in order to achieve a stabilization of inorganic contaminants by adsorption processes. Adsorption of …
Use of the eggshells in removing heavy metals from waste water - the process kinetics and efficiency
2019
Studies of the efficiency of Ni, Cu and Cd cations removal from water solutions were carried out, with the use of clay limestone, hen eggshells from eggs for consumption and hen eggshells after hatching, which main element is calcium carbonate. Hen eggshells are a waste product, which can be used as a substitute of clay limestone in removing heavy metals from wet flue gas desulphurisation installation. Mixed solutions of Ni, Cu and Cd were used in the research, with the composition similar to the waste water from wet flue gas desulphurisation installation: Ni (0.009-0.053 mmol/dm3), Cu (0.008-0.057 mmol/dm3)and Cd (0.003-0.008 mmol/dm3). The metals were determined by flame atomic absorption…
Catalytic effect of transition metals (copper, iron, and nickel) on the foaming and properties of sugar-based carbon foams
2019
Abstract Recently, bio-based carbon foams have gained much interest in many chemical industry fields because of their unique structure and properties. This study provides new information on the effects of catalytic metals (iron, nickel, and copper) on the foaming process. Specifically, the effects of these catalysts on the density, foam growth, and cell size and then further on the pore size distribution and specific surface areas after the physical activation are considered. Furthermore, some of the activated sugar foams were used in adsorption tests using methylene blue as adsorbent. Results showed that the highest effect on foam density was obtained using the iron catalyst in the foaming…
Role of elastic and electronic interactions in trapping of hydrogen by impurities in transition metals
1985
The interplay between the lattice distortion and the electronic contributions to the trapping of migrating hydrogen isotopes by substitutional impurities is investigated. We use a comprehensive calculational scheme incorporating (i) the effective-medium theory for the electronic interaction, (ii) the lattice Green’s function for elastic coupling, and (iii) the hydrogen quantum motion. The calculations for Ti and Cr impurities in V host show that lattice strain effects dominate. Cr, which otherwise provides an electronic trap site, does not induce trapping when elastic effects are incorporated. The situation in the case of Ti is just the reverse. We find no isotope dependence of the binding …
Effects of NH3 and alkaline metals on the formation of particulate sulfate and nitrate in wintertime Beijing
2020
Sulfate and nitrate from secondary reactions remain as the most abundant inorganic species in atmospheric particle matter (PM). Their formation is initiated by oxidation (either in gas phase or particle phase), followed by neutralization reaction primarily by NH3, or by other alkaline species such as alkaline metal ions if available. The different roles of NH3 and metal ions in neutralizing H2SO4 or HNO3, however, are seldom investigated. Here we conducted semi-continuous measurements of SO4 2−, NO3 −, NH4 +, and their gaseous precursors, as well as alkaline metal ions (Na+, K+, Ca2+, and Mg2+) in wintertime Beijing. Analysis of aerosol acidity (estimated from a thermodynamic model) indicat…
Effect of air on oxygen p-doped graphene on SiO2
2016
Stability in ambient air or in vacuum-controlled atmosphere of molecular oxygen-induced p-type doping of graphene monolayer on SiO2 substrate on Si is investigated by micro-Raman spectroscopy and atomic force microscopy (AFM). The Raman 2D and G bands spectral positions and amplitude ratio are affected by the permanence in air atmosphere in a time scale of months whereas the vacuum safely maintains the doping effects determined through Raman bands. No morphological effects are induced by the doping and post-doping treatments. A reactivity of ambient molecular gas with stably trapped oxygen is suggested to induce the doping modification. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
The Effect of Interferences on the Uptake of Heavy Metals by Sodium (iron) Titanates from Waste Water
2007
Sodium hexatitanate, sodium trititanate, sodium nonatitanate, and a new iron doped sodium nonatitanate were synthesized. Common interferences present in waste waters that hinder the removal of heavy metals by these ion exchangers were investigated. The presence of K+, Mg2+ and Ca2+ at 0.001-0.05 M concentration had minor effect on the amount of Pb2+, Cr3+, and Ni2+ uptake. EDTA on the other hand, interferes tremendously with the metal uptake. Both in ternary and in single system, the selectivity series is in the order: Pb2+>Cr3+>Ni2+. This order changed to Cr3+>Pb2+>Ni2+, in the presence of 0.001-0.1 M EDTA at pH 5.