Genesis of a Ag-Pb-Zn-F system: Insights from in situ sulfur …
Genesis of a Ag-Pb-Zn-F system: Insights from in situ sulfur isotope and trace elements of pyrite, and rare earth elements of fluorite in the Baiyine'lebu deposit, Inner Mongolia, China. ... Cr and As) were incorporated in the pyrite structure via isomorphism in all pyrite types, whereas ore metals such as Cu, Pb, Zn, and Sn entered pyrite as ...
The genesis of metal zonation in the Weilasituo and Bairendaba Ag–Zn–Pb
There are numerous large-scale silver polymetallic sulphide vein deposits (> 1000 t silver) in the Great Xing'an Range of Inner Mongolia in China (Table 1).The typical examples share the following major features: (1) common metal assemblages of Zn–Pb–Ag–Fe(–Cu–Sn–W); (2) the deposits are commonly massive sulphides …
Screening and Evaluation of the Bioremediation Potential of …
Introduction. Heavy metal pollution of soils has become a global environmental concern. Even essential biological trace elements, such as Zn and Cu, …
Understanding the Cu-Zn brass alloys using a short-range …
Cu-Zn brasses, like many industrial alloys, are based on solid solutions of a base metal, here the FCC Cu. In the equilibrium phase diagram 8, the Cu-Zn solid solution covers a wide composition ...
Nature and Origin of Zoned Polymetallic (Pb-Zn-Cu-Ag-Au) …
Polymetallic veins (Pb-Zn-Cu-Ag-Au) at the world-class Bingham Canyon, Utah, porphyry Cu-Au-Mo deposit have long been recognized, but poorly ... Close mobile search navigation. Article navigation. Volume 116, Number 3. May 2021 ... Evidence for Late Oligocene, Structurally Controlled, and Zoned Hydrothermal Systems Economic …
pH Dependent Leaching Behavior of Zn, Cd, Pb, Cu and As …
From the Middle Ages until the beginning of the twentieth century, extensive Zn–Pb mining and smelting was carried out in East-Belgium. By lack of waste treatment techniques and sustainable management practices, metal-bearing slags and unprocessed waste were dumped in huge tailings, which still represent an important source of …
Study on adsorption of Cu2+, Pb2+, Cd2+, and Zn2+ by …
tion of metals, and the adsorption capacity of MWSC towards Cu2+, Pb 2+, Cd 2+, and Zn 2+ were 30.18, 70.37, 44.94 and 58.96 mg/g, respectively, in monometal solutions, while …
Textural and geochemical analysis of chalcopyrite, galena …
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 …
Dissolved and Labile Concentrations of Cd, Cu, Pb, and Zn in …
The relative efficiencies of an organic and a mineral component of soils in controlling Zn, Cd, Cu, and Pb solubility and dissolution initially and during aging at pH 5.5 for up to 200 days is investigated. Metal retention by a natural organic matter (leaf compost) and a mineral model system (ferrihydrite) were tested for the organic and hydrous ferric …
Mobile forms and migration ability of Cu, Pb and Zn in …
The total concentrations of Cu, Pb and Zn and their bioavailability were studied in forest soil and vegetative communities (grass and wild strawberries) collected …
Dissolved and labile concentrations of Cd, Cu, Pb, and Zn in …
Lead solubility generally remained very low except in the ORG system in which the total dissolved Pb reached 0.25 {micro}M. The ORG system shows that about 75% of total dissolved Cu and 80% of total dissolved Pb exist as nonlabile organo-metal complexes, while soluble nonlabile complexes account for about 40% of dissolved Zn.
Zwitterion-chitosan bed for the simultaneous immobilization of Zn…
The mechanism of grafting onto chitosan is illustrated (Fig. 2).The polymerization reaction of chitosan with the MAA monomer and GMA cross-linker, KPS is used as initiator which is very effective in degrading chitosan (Singh et al., 2006, Prashanth and Tharanathan, 2003, Hsu et al., 2002).When KPS solution of concentration 0.025 …
An Ex-Situ Immobilization Experiment with Zn, Pb, and Cu in …
The remediation of dredged marine sediments contaminated by metals has drawn increasing attention globally. Immobilization was regarded as a promising method for reducing adverse impacts on marine ecosystems. In this study, kaolinite and limestone were used as amendments to immobilize Zn, Pb, and Cu in dredged marine sediments, …
Competitive adsorption of Cu
The objectives of this study were to investigate and compare the competitive adsorption behavior of Cu 2+, Pb 2+, Cd 2+, and Zn 2+ onto PAC-APAM WTRs in mono …
A screen-printed carbon electrode modified with a …
AbstractThe authors report on a disposable sensor for the differential pulse anodic stripping voltammetric (DPASV) determination of the ions Zn(II), Pb(II) and Cu(II). Simultaneous detection is accomplished by using a screen-printed carbon electrode (SPCE) co-modified with an in-situ plated bismuth (Bi)) film and gold nanoparticles (AuNPs). The synergistic …
An ultrasound-assisted procedure for fast screening of …
The recoveries in the range 96–100 % were obtained for Cu, Cr, Ni, Pb and Zn in all fractions by Pérez-Cid et al., but it must be mentioned that the content of …
Plants | Free Full-Text | Screening of Native Plants Growing on a Pb/Zn
Screening of native plant species from mining sites can lead to identify suitable plants for phytoremediation approaches. In this study, we assayed heavy metals tolerance and accumulation in native and dominant plants growing on abandoned Pb/Zn mining site in eastern Morocco. Soil samples and native plants were collected and …
Ore Genesis and Geodynamic Setting of Laochang Ag-Pb-Zn-Cu …
The Laochang Ag-Pb-Zn-Cu deposit, located in the southern margin of the Sanjiang Tethys Metallogenic Belt (STMB), is the typical Ag-Pb-Zn-Cu deposit in this region. Its orebodies are hosted in the Carboniferous Yiliu Formation volcanic-sedimentary cycle and occur as stratiform, stratoid and lenticular. Whether or not the stratabound ore belong to the …
Hydrothermal Transport of Ag, Au, Cu, Pb, Te, Zn, and Other …
In order to analyze the concentrations of Ag, As, Au, Cd, Cu, Hg, Mn, Mo, Ni, Pb, Se, Sb, Te, Tl, W, and Zn in deep hydrothermal chloride waters at 195° to 320°C, and in shallow boiled chloride waters at 160° to 230°C, we sampled wells drilled to 3-km depth in geothermal systems of the North Island, New Zealand.
Cadmium foliar application affects wheat Cd, Cu, Pb and Zn …
Cadmium is toxic to plants, easily reaching unsafe levels for animal and human consumption. A greenhouse experiment investigated the effect of foliar-applied Cd on the accumulation and distribution of Cd, Zn, Cu and Pb in wheat (Triticum aestivum) grown in heavy metal-contaminated soil.Cadmium solutions (0, 10, 20, 30 and 40 mg L −1) were …
The function of digestive enzymes on Cu, Zn, and Pb release …
The bioaccessibility of soil heavy metals is the solubility of soil heavy metals in synthetic human digestive juice, which is usually determined using in vitro digestion test. To reveal the effects of digestive enzymes on soil heavy metals bioaccessibility, three representative in vitro digestion tests, Simple Bioaccessibility Extraction Test (SBET), …
Distribution of Cd, Pb, Zn and Cu and their chemical …
The high Zn and Cd proportion in the mobile fraction clearly illustrated that they are more mobile and easily transported than Cu and Pb and that's why they are therefore of particular concern, especially Cd, which has been proved with high toxicity to organism (Li and Thornton 1993a, 2001; Xian 1989; Verner and Ramsey 1996).
Heavy metal(loid)s in agriculture soils, rice, and wheat across …
The colored patches represent the pollution levels of As, Cd, Cr Cu, Ni, Pb, Zn, and Hg in the agricultural soil of China, with the bar graphs representing the provincial metal concentrations of rice and wheat (mg/kg for As, Cd, Cr …
A giant porphyry-skarn-epithermal Mo-W-Cu-Zn-Pb-Ag metallogenic system
The NCC is composed of two blocks, the Western and Eastern Blocks, which are separated by the Trans-North China Orogen (TNCO; Fig. 1).This orogen was formed when the two blocks collided around 1.85 Ga, which led to the final amalgamation and stabilization of the NCC (Zhao et al., 2001).Although the NCC remained a coherent and …
Screening and Evaluation of the Bioremediation Potential of …
Strain S44, identified as Acinetobacter sp. FQ-44 based on 16S rDNA sequencing, was specifically chosen as the most favorable strain owing to its strong …
Concentration and pollution assessment of heavy metals …
The sediments were analysed for Cu, Zn, Pb, Cd, Cr, As, and Ni using a sequential extraction scheme according to the improved BCR (European Community Bureau of Reference) method. ... The screening ...
New Prospects in the Electroanalysis of Heavy Metal Ions (Cd, Pb, Zn …
The detection of toxic heavy metal ions, especially cadmium (Cd), lead (Pb), zinc (Zn), and copper (Cu), is a global problem due to ongoing pollution incidents and continuous anthropogenic and industrial activities. Therefore, it is important to develop effective detection techniques to determine the levels of pollution from heavy metal ions …
Source analysis and ecological risk assessment of heavy …
Cd, Pb, Zn, and Cu are mainly industrial and mobile sources, and the sources of Ni are mainly agricultural and natural sources. While building Anxin County, …
Mobile Screening Units for the Early Detection of Cancer: A …
Abstract. Mobile screening units (MSUs) provide cancer screening services outside of fixed clinical sites, thereby increasing access to early detection …
Australian Zn-Pb-Ag Ore-Forming Systems: A Review and Analysis
Over 93 percent of Australia's Zn-Pb-Ag resources were produced by four ore-forming system types: Mount Isa (56% of Zn), Broken Hill (19%), volcanic-hosted massive sulfide (VHMS; 12%), and Mississippi Valley (8%). Moreover, just 4 percent of Australia's land mass produced over 80 percent of its Zn.