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Aided phytoextraction of Cu, Pb, Zn, and As in copper-contaminated soils with tobacco and sunflower in crop rotation: Mobility and phytoavailability assessment. …
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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 …
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The stoichiometric ratios Cu:C, Ni:C, Pb:C, and Zn:C were also calculated. In all sites, a higher Na concentration was found in the 0–10 m from the forest edge. This zone was characterized by increased pH in the O horizon, increased Zn and Ni in the A horizon, and a decreased Pb in the O horizon. There was no clear pattern for the Cu ...
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روتشستر هي مدينة في مقاطعة ... يقع المدينة في مقاطعة مونرو في ولاية نيويورك، يبلغ مساحة إجمالية قدرها 37.1 ميل مربع (96 كم 2)، ومساحة الأرض 35,8 ميل مربع (93 كم 2)، ويبلغ مساحة الماء حوالي 1.3 أميال مربعة ...
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The quality of stormwater degrades due to the strong mobility and toxicity of Cu, Pb and Zn ( Ma et al., 2016, Chen et al., 2020 ). Furthermore, Cu and Zn have been …
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3.2. Pseudototal pools of Cd, Cu, Pb and Zn. Table 1 presents the AR extractable contents of Cd, Cu, Pb and Zn in urban, rural, industrial and mining soils. In urban soils, metal levels showed a relatively large range as well as marked differences between mean and median concentration values (particularly for Cu and Pb) which are …
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معهد روتشستر للتكنولوجيا - دبي هو حرم جامعي تابع لمعهد روتشستر للتكنولوجيا، نيويورك في دبي، الإمارات العربية المتحدة.[3] تقع الكلية في واحة دبي للسيليكون[4] وبدأت في تقديم دورات الدراسات العليا بدوام جزئي في خريف 2008.
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desired Cu-Pb selectivity, a feasible flowsheet was developed based on a modified Black Mountain (Cu-Pb-Zn concentrator) processing route for the Cu circuit, …
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The Uragen giant sandstone-hosted Zn–Pb deposit has a proven reserve of 5.90 Mt metals in the southern ore zone and potentially 10 Mt metals for the whole deposit, and orebodies are strictly confined to the bleached clastic rocks of the Lower Cretaceous red beds. The bleaching has been used to guide lead–zinc exploration; however, its nature …
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In this study, the possibility of using concrete-sludge recycling as an immobilizer, including dried sludge (DS), precipitated calcium carbonate (PCC), and calcite-coated particles (CCP), was evaluated for the remediation of Cu-, Pb-, and Zn-contaminated aqueous solutions. Experimental variables characterizing immobilization, including …
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The K d 1 0 0 values observed for sorption by the whole H horizon rank the metals in the order Cr ≈ Pb ≫ Cu ≫ Cd > Zn ≈ Ni, and the K d 1 0 0 values for retention following the desorption stage in the order Cr > Pb > Cu ≫ Cd > Zn > Ni, where ≈ indicates a difference of less than a factor of 1.1 and ≫ a difference of more than a ...
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2.1 Copper. The element copper (Latin, cuprum) is primarily obtained from minerals such as cuprite (CuO 2), tenorite (CuO), malachite (Cu 2 CO 3 OH 2), chalcocite (Cu 2 S), covellite (CuS), and bornite (Cu 5 FeS 4).Copper is a natural element found at low contents ranging from 50 to 70 mg kg −1 in soils, with an average of 50 mg kg −1 in the …
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خيارات لمراكز علاج اضطرابات الأكل في مدينة روتشستر بنيويورك والتي تساعد المراهقين والبالغين الذين يعانون من مجموعة من مشكلات اضطرابات الأكل.
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The mean concentrations of Cu, Zn, and Pb in washed leaves were 15, 51, and 52 mg kg −1 dry weight respectively for P. eldarica and 15, 41.8 and 51.4 mg kg −1 dry weight respectively for F. excelsior. Critical toxic values of Cu, Zn, and Pb for plants are 20–30, 100, and 10 mg kg −1 (Yilmaz and Zengin, 2004).
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Phytoextraction is a green remediation technology for clean-up contaminated soils. The effect of chelator application including EDTA, EDDS, and citric acid on phytoextraction of Cu, Zn, and Pb into high biomass vetiver (Vetiveria zizaniodides) was investigated in the hydroponic experiment and the pot experiment. In the hydroponic …
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In different leaching temperature, the leaching rate of Pb changes curve shown in figure 9 over time, and the leaching rate increased with the increase of temperature. Figure 10 was a product by disposed the data about Pb leaching rate and reflected the relationship between 1−(1−α) 1/3 and 1–3(1−α) 2/3 + 2(1−α) and
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In this study, the immobilization performance and mechanisms of heavy metals (HMs) in swine manure (SM) during anaerobic digestion (AD) with biochar (BC) and KH 2 PO 4-modified biochar (BP) were investigated.BC and BP addition decreased DTPA-extractable Cr, Cu, Pb and Zn amount, transformed these HMs to more stable state, and …
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Aims The main aim of this study was to validate the HYDRUS-2D model for the simulation of Cd, Cu, Pb and Zn transport within a soil column and their accumulation by willows. Methods A simulation of metal transport and uptake by willow was implemented using the HYDRUS-2D code. Two scenarios of the column experiment were compared: …
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The genesis of the Mount Isa Cu-Pb-Zn system, northern Australia, is highly debated. Three metallogenic models have previously been proposed to explain the close spatial relationship between a world-class Cu and Pb-Zn deposit: (1) ca. 1650 Ma syngenetic Pb-Zn mineralisation that has been re-mobilised and overprinted by ca. 1520 …
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The Dalong deposit is a new Pb–Zn discovery with a proven reserve of 33,000 t Pb at a grade of 0.90% Pb, 66,000 t Zn with a grade of 3.43% Zn, and 28.5 t Ag at a grade of 5.9 g/t Ag. Recent mapping and mining suggest that the Dalong Pb–Zn deposit might be distal to the Xiangdong W–Sn deposit (416 Geological Team 2013, unpublished internal ...
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The uptake and distribution of four heavy metals, including copper (Cu), cadmium (Cd), lead (Pb) and zinc (Zn), and those of total phosphorus (TP) in 30 plants in North China were investigated through pot trial experiments. Accumulation and distribution of heavy metals or TP were associated with plant species, tissues, metal elements and …
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The plants were washed, dried, and burned at 300 °C for 24 h in a drying oven. These ash and water samples were analyzed by ICP-MS to determine the amounts of Cu, Pb, Zn, and As. The Cu, Pb, Zn and As concentrations in the gallery water of the study area detected 67, 7.5, 7230, and 96 μg L −1, respectively.
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The genesis of the giant Ag-Cu-Pb-Zn polymetallic mineralization in the northern Lanping basin, Southwest China, remains controversial. To address the sources of metals, a systematic study on Hg isotope compositions was conducted for the Cu-dominated deposit at Baiyangping and the Pb-Zn-dominated deposits at Fulongchang and Liziping. …
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The Huogeqi Cu-Pb-Zn: A case of orogenic-type base metal deposit. Studies in the past ten years have shown that the Huogeqi Cu-Pb-Zn deposit share broad …
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Cu–Zn is an important binary alloy system. In the interested temperature range from 300 to 1500 K, there are eight phases, liquid, Cu, β, β′, γ, δ, ϵ, and Zn phases. The thermodynamic descriptions of the Cu–Zn system are reassessed using the CALPHAD method. A new description of liquid phase and simplified description of body …
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The isotopic composition correlations for Cu (p < 0.01, r = −0.48), Zn (p < 0.01, r = −0.71) and Pb (p < 0.01, −0.78) concentrations were all negative and the δ 65 Cu, δ 66 Zn and 206 Pb/ 207 Pb became lighter as the concentration increased (Fig. 3 and Table 4). The sampling site close to the terrestrial regions had higher metal ...
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The samples were shaken with solutions containing 10 mmol/L Cd, Cu, Pb and Zn (in form of nitrate) both separately and jointly for 24 h at 22 °C using a soil: solution ratio of 1:30. A background electrolyte of 0.01 M Ca (NO 3) 2 and initial pH of 5.25 ± 0.10 was used in each cases.
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The decreased HMs (Cr, Cu, Pb and Zn) in BC and BP amended treatments might be due to these HMs adsorption by biochar or complexation with phosphorus. 3.5. Effects of biochar on speciation of HMs. The variations of the species of As, Cr, Cu, Pb and Zn during the AD are shown in Fig. 1 (b)-(f). Different fractions of HMs have different …
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Abstract. Core Ideas. Organic matters rich in functional groups (e.g. amines, carboxylic, and hydroxylic) stimulated the microaggregation of fine silt/silt particles in …
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