ADSORPTION OF Zn, Cd, Pb, Cu IN SOILS AFFECTED BY …
Цель работы – определение механизмов адсорбции Zn, Cd, Pb, Cu в почвенном покрове в. зоне высокой техногенной активности с помощью модели …
WhatsApp: +86 18221755073
Closely-related species of hyperaccumulating plants and their ability
This study helps to provide guidance for screening new hyperaccumulators as well as helps to understand hyperaccumulators under an evolutionary perspective. 2. ... Given the limitation in the database, As, Cd, Cu, Mn, Ni, Pb and Zn hyperaccumulators were used to calculate their trait-state changes and D value, but only Mn, ...
WhatsApp: +86 18221755073
(PDF) Regularities of Cu, Pb and Zn adsorption by chernozems of the
The parameters of Cu 2+, Pb 2+ and Zn 2+ adsorption by chernozems of the south of Russia and their particle-size fractions were studied. The adsorption capacity of chernozems for Cu 2+, Pb 2+, and
WhatsApp: +86 18221755073
(PDF) Heavy metals (Cd, Pb) and trace elements (Cu, Zn) …
"The heavy metal Zn values obtain in this study are similar to values of Zn in food reported in some studies" [31,42], but are higher than the range (0.04 to 0.19 mg/kg) reported by Edem et al. in ...
WhatsApp: +86 18221755073
Genesis and Evolution of Pb-Zn-Ag Polymetallic Deposits
The Pb isotopic composition of the sulfides from the Qiandongshan–Dongtangzi Pb-Zn deposit (with 206 Pb/ 204 Pb ratios of 18.06 to 18.14, the 207 Pb/ 204 Pb ratios of 15.61 to 15.71, and 208 Pb/ 204 Pb ratios of 38.15 to 38.50) is similar to that of the Late Triassic Xiba granite pluton, suggesting that they share the same Pb source. The ...
WhatsApp: +86 18221755073
Heavy metal contamination levels, source distribution, …
Zn, Sn, Sb, and Pb have the highest concentrations in the green zone, while V, Fe, Co, and Cu represent the utmost values on roads. Moreover, Mn and Ni are the prevailing metals in the fine sand fraction of driveways …
WhatsApp: +86 18221755073
Contamination and health risk assessment of heavy metals in …
The concentrations of Cd, Pb, Cu, and Zn in legumes, cereals, cereal products, and fried potatoes obtained from the Egyptian market were analyzed by Salama and Radwan (2005), and the results denoted that the Cu and Zn levels are generally less than the permissible levels; however, the concentration of Pb in broad beans, common bean lupine, etc., were greater …
WhatsApp: +86 18221755073
Thermodynamic assessments of the Cu-Pb-Zn and Cu-Sn-Zn …
Cu-Pb-Zn, Cu-Sn-Zn SYSTEMS 419 Kunchev and Dobrev [83Kun] determined the activities of Zn and Pb for the commercial CuZn39Pbl and CuZn39Pb2 alloys m the temperature range 773-1223 K. Surapunt and Vazquez [94Sur] carried out activity measurements for liquid alloys at 1075 K. Thermodvnamic assessment All the data enumerated above were critically ...
WhatsApp: +86 18221755073
Method for screening Cu, Zn or Pb phytotoxicity on switchgrass …
Method for screening Cu, Zn or Pb phytotoxicity on switchgrass and reed canarygrass. ASA-CSSA-SSSA 2017 Tampa 2017/10/22 - 2017/10/25. Plain language summary . In North America, there is a large number of trace metal (TM) contaminated sites, which cannot be used for human or animal food production. Using these sites for the production of ...
WhatsApp: +86 18221755073
Rubtsovsk Mine, Rubtsovsky District, Altai Krai, Russia
Volcanogenic massive sulphide (VMS) deposit, located about 145 km from Zmeinogorsk, and 35 km from the Kazakhstan-Russia border. Locality description (translated from Webmineral, see link below): The deposit is located 20 km southeast of the city of Rubtsovsk near the northern outskirts of the village of Poteryaevka.
WhatsApp: +86 18221755073
Risk assessment based on Cr, Mn, Co, Ni, Cu, Zn, Ba, Pb, and …
The descending order of the mean HQ values for each metal in spring and winter was Ba>Pb>Mn>Ni>Cu>Zn, and Ba>Mn>Pb>Ni>Cu>Zn in summer. Seasonal variations in health risks may be influenced by the intensity and type of human activity, such as fuel combustion for residential heating (Li et al., 2018).
WhatsApp: +86 18221755073
Measurements of Cd, Cu, Pb and Zn in the lower reaches of …
Measurements of Cd, Cu, Pb and Zn in the lower reaches of major Eurasian arctic rivers using trace metal clean techniques. Trace metals in estuaries in the Russian Far East …
WhatsApp: +86 18221755073
Contrasting regimes of Cu, Zn and Pb transport in ore-forming
Sulfur and chlorine are the two most important ligands accounting for metal transport in the upper crust. In this study, four metal- and sulfur-saturated model fluids with varying salinities and redox states were simulated in the Fe-Cu-Pb-Zn-Au-S-C-H-O system, over a wide pressure-temperature (P-T) range (50–650 °C, 0.8–5.0 kbar), in order to compare the …
WhatsApp: +86 18221755073
questions and problems Flashcards
Study with Quizlet and memorize flashcards containing terms like Arrange Pb, Mg, and Zn in order of their activities, listing the most active first, Arrange Cu, Ag, and Zn in order of their activities, listing the most active first, Arrange Mg, H, Ag in order of their activities, listing the most active first. and more.
WhatsApp: +86 18221755073
Interatomic Potentials Repository
This repository provides a source for interatomic potentials (force fields), related files, and evaluation tools to help researchers obtain interatomic models and judge their quality and applicability. Users are encouraged to download and use interatomic potentials, with proper acknowledgement, and developers are welcome to contribute potentials for inclusion.
WhatsApp: +86 18221755073
(PDF) Tellurium-bearing minerals in zoned sulfide chimneys from …
LA-ICP-MS data on trace element zonation reflecting a local variation of physicochemical conditions of mineralization in black, grey and clear smokers from the Pacific and Atlantic …
WhatsApp: +86 18221755073
Sediment-hosted Zn–Pb–Cu deposits in the Central African Copperbelt
Locally, the "Grand Lambeau" contains Cu mineralization within sandy beds of the Kiubo Formation close to the "Cyclopean breccia." Below the 950 m level (Fig. 9, Fig. 10), the main pipe-like orebody diverges into a central Zn or Zn–Cu–Pb-rich branch and an external Zn-rich branch. Below the 1350 m level, the concentration of Zn in ...
WhatsApp: +86 18221755073
Biomineralization mechanism and remediation of Cu, Pb and Zn …
The contaminated soil was prepared according to twice the risk screening value in GB15618-2018 (Yu et al., 2019), the Soil Environmental Quality-Risk Control Standard for Soil Contamination of Agricultural Land (trial) (Cu:200 mg/kg, Pb:240 mg/kg, Zn: 500 mg/kg). It was aged for 90 days under natural conditions to prepared the heavy metal ...
WhatsApp: +86 18221755073
A comparison of Cu, Pb, As, Cd, Zn, Fe, Ni and Mn determined …
A high degree of linearity was found for Fe and Pb with the X-ray tube instrument and for Fe, Cu, Pb, Zn, Cd and Mn with the dual source instrument. FPXRF analyser performance improved with increased analysis time for Cu, Mn and Pb, whilst Fe, Zn, Cd, Ni and As showed no significant improvement.
WhatsApp: +86 18221755073
Pb-Zn-Cu accumulation from seafloor sedimentation to …
The Tiemurt Pb-Zn-Cu deposit is situated in the southern margin of the Chinese Altay Orogen (Fig. 2).It was first discovered in 1987 with contained metals of 0.29 Mt Pb + Zn and 0.14 Mt Cu (Wan et al., 2010a).Some geological and geochemical characteristics of primary VMS mineralization are preserved at Tiemurt, but the major Pb-Zn-Cu mineralization is adjacent to …
WhatsApp: +86 18221755073
A giant porphyry-skarn-epithermal Mo-W-Cu-Zn-Pb-Ag …
Sphalerite and pyrrhotite grains from the Luotuoshan Zn-Cu-W deposit and quartz from the Lengshuibeigou Pb-Zn-Ag deposit display Rb-Sr isochron ages of 139.6 ± 2.3 Ma and 40 Ar/ 39 Ar plateau age of 137.9 ± 0.4 Ma, respectively (Wang et al., 2013, Xing et al., 2016). Were these distal mineralizations genetically related to the magmatism at ...
WhatsApp: +86 18221755073
A combined model method was used to identify the main …
Inductively coupled plasma mass spectrometer (ICP-MS, NexION350X, PE, US) was used to determine the contents of Cd, As, Cu, Pb, Zn, Cr, Mn and Ni in the samples, …
WhatsApp: +86 18221755073
Heavy metal content and health risk assessment of
This study collected 203 articles published up to 2022 based on a meta-analysis and analyzes the heavy metals pollution (Cd, Cr, Ni, Pb, Cu, Zn, Hg, and As) in PM2.5 and PM10 particles in China to accomplish the following objectives: 1) To evaluate the temporal and spatial distribution of heavy metal pollution in PM2.5 and PM10 in China; 2) To ...
WhatsApp: +86 18221755073
Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the Use …
The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to evaluate …
WhatsApp: +86 18221755073
Standards for the contents of heavy metals in soils of some states
The Russian sanitary hygienic GOST 17.4.102–83 classifies As, Cd, Hg, Se, Pb, and Zn as highly hazardous elements, whereas Ni, Mo, Cu, and Sb as moderately hazardous ones [4].This list of general toxicity is also applied for assessing the hazard of metals/metalloids in the soils despite the fact that it ignores the interaction between the pollutants and soil …
WhatsApp: +86 18221755073
Background concentrations of trace metals As, Ba, Cd, Co, Cu, Ni, Pb
Strong association of Cu, Pb and Zn may indicate similar contamination sources (Facchinelli et al., 2001; Song et al., 2014). ... Role of native parent material, proximity to major roads, housing age and screening guidelines. Environ. Pollut., 156 (2008), pp. 723-731. View PDF View article View in Scopus Google Scholar. Zhang et al., 2018.
WhatsApp: +86 18221755073
Co (II), Ni (II), Cu (II), and Zn (II) complexes with Benzothiazole
Cisplatin was used as control. The complexes cytotoxicity was determined to be concentration dependant. The screening results indicated that all of the metal complexes had significant anticancer activity (Table 3). The order of IC 50 values of the metal complexes against both cell lines as Zn(II) > Ni(II) > Co(II) > Cu(II) > Ligand (Fig. 8).
WhatsApp: +86 18221755073
The world's lead-zinc mineral resources: Scarcity, data, issues …
The country data given in Table 4 indicates that the country with the largest Pb-Zn resources is Australia at 59.5–95.4 Mt Pb-Zn, followed by Russia with 28.0–62.9 Mt Pb-Zn, Canada with 22.8–76.8 Mt Pb-Zn and Peru at 11.7–52.7 Mt Pb-Zn, although Peru also has substantial Cu within their Pb-Zn resources at 39.7 Mt Cu (Canada and ...
WhatsApp: +86 18221755073