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·Phytosiderophores PS are root exudates released by members of the Poaceae family for the acquisition of Fe PS mediated Fe uptake is referred to as strategy II iron acquisition Marschner et al 1986 Due to the high affinity of PS for other metals they can also solubilize micronutrients like Cu Zn and Ni Murakami et al 1989 Zhang et al 1991 Awad and
·Table 3 shows that Cu Zn Pb Cd and Cr contents are equal to 425 526 574 1134 321 356 4 and 576 ppm respectively These levels are far above the average concentrations in the limit values 150 ppm for the Cu 150 300 ppm for Zn 50 300 ppm for Pb 1 3 ppm for Cd and ppm for Cr Kouame et al 2006 The
·The main phase changes of Zn and Pb in the reduction process were ZnFe 2 O 4 → ZnO → Zn and PbSO 4 → PbO → Pb and the generated Zn and Pb gases escaped and were collected via condensation In the kinetic study the volatilization of Zn was controlled by three dimensional diffusion Jander with an apparent activation energy of kJ
·Quarry dust satisfies the reason behind the alternative material as a substitute for sand at very low costIt is found that 40% replacement of fine aggregate by quarry dust gives maximum result in
·Street dust samples were collected from five different types of land use patterns busy traffic zone urban residential area national highways industrial area and sensitive area in a medium sized industrial city Asansol samples were fractionated into ≤53 µm and analyzed for potential toxic elements PTEs viz Zn Cd Pb and Cu The mean total
·In this study the concentrations of Cu Zn Cd and Pb in street dust at 3877sites throughout China were obtained from the published scientific literature Based on these data the contamination levels spatial distributions sources and potential health risks of heavy metals in street dust were comprehensively estimated
·The transfer uptake bioavailability of phosphorus P Cu Cd Zn and Pb in rhizosphere of Zizania latifolia ZL and Myriophyllum verticiilaturn MV cultivated in rhizoboxes in Lake Erhai China is evaluated by DGT diffusive gradients in thin films technique DGT induced fluxes in sediments DIFS model reveals that resupply ability r liable pool size in sediment
·Fugitive and non controlled emissions of metal rich particles from mining and non ferrous metallurgical are the main source of metals of atmospheric metals 1 2 which in turn can affect urban
·The application of oxygen rich side blowing furnaces in the direct lead smelting process has excellent potential and ideal capability for co processing various feedstocks such as zinc leaching residues jamesonite precipitates lead paste and lead silver dregs etc In this study the industrial application for this process has been investigated and the material
·The high temperature tube furnace was applied to simulate the rotary hearth furnace RHF for the direct reduction of zinc bearing dusts from steel plants The removal mechanism of Zn Pb and alkalis from cold bonded briquettes made by mixing metallurgical wastes such as dust from bag house filter OG sludge fine converter ash and dust from the
·This research proposed an efficient and environmentally friendly technology for recovering valuable metals from copper flash converting slag In a reducing atmosphere pyrite is used as the sulfurizing agent to efficiently and selectively sulfurize and recover Cu Pb and Zn of copper flash converting slag Cu of copper flash converting slag is mainly presented in the
· IntroductionEC Directive 91/271/EEC CEC 1991 banned the disposal of sewage sludge at sea on 31st December 1998 as a result of which applications to agricultural land are likely to increase as this is an economic and beneficial alternative means of the UK 526 000 tonnes of the million tonnes of sludge dry solids produced in 1996/7
·Remarkably the intensity of Cu2p spectrum is relatively stronger than that of precipitate from the synthetic Cu containing solution The content of Cu I in the precipitate is 43% through calculating the peak areas of Cu2p 1/2 and Cu2p 3/2 while Cu II is 57% From above this process using sacrificial Zn anode also works for Cu and Fe
·A large amount of quarry dust waste is dispose into landfills every year This waste was obtained as a by product during the production of aggregates through the crushing process of rocks in
· Sequential extraction of metals The sequential extraction Tessier et al 1979 was carried out to partition the element Zn Cd Pb and Cu in the street dust into five fractions exchangeable F1 bound to carbonate phase F2 bound to iron and manganese oxides F3 bound to organic matter and sulfides F4 and residual or lattice metals F5
·K Shyam Prakash [2] 2016 The concept of replacement of natural fine aggregate by quarry dust which is highlighted in the study could boost the consumption of quarry dust generated fromquarries By replacement of quarry dust the requirement of land fill area can be reduced and can also solve the problem of natural sand scarcity
·Background Particles from non exhaust emissions derived from traffic activities are a dominant cause of toxic metal pollution in urban environments Recently studies applying multiple isotope values using the Iso source and positive matrix factorization PMF models have begun to be used as useful tools to evaluate the contribution of each pollution source in urban
A new process for the preparation of active zinc oxide and synergistic recovery of valuable elements using zinc containing dust is proposed The process can achieve the maximum recovery of Zn K Na Pb Bi Cd In and Sn from the dust and produce active zinc oxide KCl NaCl PbSO 4 BiOCl cadmium sponge crude indium and crude tin The
·The present study investigated biosorption of Pb II and Zn II using a heavy metal tolerant bacterium Oceanobacillus profundus KBZ 3 2 isolated from a contaminated site The effects of process
·The aim of this study was to investigate the concentration health and ecological risks of selected potentially toxic elements Pb Cd Cr Co Cu Zn V Ni and As bound to air particles
·Here driven by the low carbon notion we report a process that enables the selective retrieval of multiple metals As Cu Pb Zn and Bi from copper smelting flue dust CSFD This process employed low temperature roasting to separate arsenic from heavy metals thereby eliminating the tedious separation steps required by existing processes
·The scanning map of elemental distribution on the surface Fig 3 c shows the presence of Pb S O Cu Bi Zn elements almost throughout the whole analysis area indicating the presence of ZnSO 4 and Bi 2 O 3 in the dust The distribution characteristics of Zn and Cu in some areas are the same as those of As proving that there are zinc
·Due to the advancement of industrialization and the development of the metal smelting industry cadmium Cd as a highly toxic heavy metal element is discharged into the natural environment in the form of dust slag and waste solutions during the Cu Pb Zn smelting process causing great harm to the soil water environment and human health Meanwhile Cd
·The iron ore IO was retrieved from Dashihe ore concentrator in Tangshan Hebei Province China According to the phase analysis the main iron minerals were magnetite Fe 3 O 4 accounting for % and hematite Fe 2 O 3 accounting for % and there was also a small amount of gangue minerals % quartz SiO 2 and % anorthite CaAl 2 Si
·The strong relationships between Cu Zn and Pb Table 3 suggest quite similar pollution sources Cu and Zn might originate from agricultural runoff and industrial and domestic wastewater as
