— The Bieluwutu Cu-Pb-Zn deposit is located in the Ondor Sum region of the western Xing'an-Mongolia orogenic belt, North China. The host rocks of the deposit consist of metasandstone, tuffaceous slate, andesitic tuff and fragmented felsic volcanic rocks, which have previously been regarded as the Early Carboniferous Amushan Group.

 — As expected, the presence of bacteria resulted in increased concentrations of water-extractable Cu, Zn, Pb, Cd, and Fe in autoclaved soil compared to axenic soil (Figure 2). These results suggest that the 10 Cu/Zn-resistant isolates had metal-solubilizing potential in heavy metal-polluted soil, thereby increasing metal bioavailability.

 — Additionally, compared to certain studies, the mean concentration values of As, Cu, Pb, Cd and Ni in the study area were 1.05–2.91 times those in urban soils in China (Cheng et al., 2014), the …

 — The Observed affinity at pH < 5.5 is Fe >>Cu » Zn > Pb, however, at the highest pH value tested (5.75) the separation of each metal decreases and the order of extraction becomes Cu » Zn > Fe > Pb. Fig. 4 b shows the pH dependence of metal distribution onto carboxylic acid functionalised C107E ( Fig. 1 F) from an acetate media.

 — 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 …

 — 1 Altmetric. Explore all metrics. Abstract. The environmental assessment and identification of sources of heavy metals in Zn-Pb ore deposits are important steps for …

 — Introduction. The term "heavy metals" refers to a group of metallic elements with densities greater than 5 g/cm 3, including mercury (Hg), copper (Cu), zinc (Zn), lead (Pb), chromium (Cr), cadmium (Cd), and nickel (Ni), among others.Because of similarities in chemical properties and environmental behavior, metalloid arsenic (As) is often grouped …

 — Screening of native plants from wasteland surrounding a Zn smelter in Feng County China, for phytoremediation Ecotoxicol Environ Saf. 2018 Oct 30; 162:178-183. ... and the total Cd, Cu, Pb, and Zn contents in the aerial parts of plants ranged from 5.57 to 268.5, 14.34 to 140.90, 10.43 to 570.3, and 110.3 to 1350 mg kg-1, respectively. …

 — The concentrations of Cd, Pb, Cu and Zn were far less than the limitation of heavy metals in irrigation water (Cd: 10 μg L −1, Pb: 200 μg L −1, Cu: 1000 μg L −1, Zn: 2000 μg L −1) in ...

 — Unlike Cr, Cu, Cd, and Pb, the maximum Zn concentration was not found in plants at site HN-4 or HN-5, but in A. philoxeroides (365 mg kg −1) at site HN-3. Furthermore, Z. candida and C. dactylon at site HN-2 and even C. rotundus at Site HN-6 contained Zn concentrations greater than 200 mg kg −1, exceeding the highest Zn …

 — The Huangshaping deposit represents the largest Pb Zn polymetallic skarn deposit in the southern Hunan district of Nanling Range (South China), which is uniquely characterized by having both Jurassic W–Sn–Pb–Zn and Cu–Pb–Zn skarn mineralization (reserves: 152.9 kt WO 3 @ 0.2 %, 43.2 kt Mo @ 0.06 %, 761.3 kt Pb @ 3.55 %, 1529.1 …

 — At Pb/Zn smelters, the spatial distribution of Cd is similar to that of Pb and Zn, because Cd is one of the main associated components of Pb/Zn ore (Hu and Ding, 2009). As the summary statistics of current study shown in Fig. 2, the results of the significantly correlated relationship of Pb, Zn, Cd and As indicate that the correlation between ...

Metal pollution in urban soils due to smelting and electroplating has become a severe problem in China. In this study, the concentration, chemical fraction, and leaching behavior of typical metals (Cu, Zn, Cd, and Pb) in soil samples from ten metallurgical sites were studied. The results show that s …

So far, the heavy metal concentrations in soils and vegetables were all below the permissible limits set by the Ministry of Environmental Protection of China and World Health Organization. The transfer factors of six heavy metals showed the trend as Cd > Zn > Cu > Pb > As > Cr, which were dependent on the vegetable species.

 — Cd, Hg, As, Pb, Cr, Cu, Ni, Zn, P, S, N, SiO 2, MgO, CaO, Corg, and pH were analyzed and tested, and the analytical methods and detection limits for the …

 — The results of this study will enhance our understanding of the status of soil heavy metal pollution (mainly Cd, Pb, Zn, and Cu) in China and provide valuable …

 — An exploratory study on soil contamination of heavy metals was carried out surrounding Huludao zinc smelter in Liaoning province, China. The distribution of total heavy metals and their chemical speciations were investigated. The correlations between heavy metal speciations and soil pH values in corresponding sites were also analyzed. …

 — The average concentrations of Cu, Zn, Pb, Cd, and Mn in the soil samples all exceeded the local geochemical background value (background values of Cu, Zn, Pb, Cd, and Mn are 43.0, 81.0, 28.5, 0. ...

 — Based on the screening criteria for soil pollution risk in China (Ministry of Ecology and Environment of the People's Republic of China, 2018) and globally recognized standards of the US Environmental Protection Agency (United States Environmental Protection Agency, 1996, 2002), the upper limits of Cd, Pb, Zn and Cu were 1 mg/kg, 80 …

 — These values also exceeded the cleanup screening levels of freshwater sediments in the USA. ... (Bowen, 1979) besides China. Cd, Pb, Zn, Cu and As have been frequently reported as main soil heavy ...

SOURCE IDENTIFICATION OF SOIL Cu, Zn, Pb, AND Cd FROM ANTHROPOGENIC ACTIVITIES BY ... CHINA Lefeng Qiu 1, Muye Gan, Ke Wang1, Jinsong Deng1,* Yang Hong2, Junfeng Xu3 and Weiping Zhu3

 — To bridge this gap, 18 topsoil samples of gray-brown desert farmland soil from the Jinchuan District, Gansu Province, China, were collected to analyze the total concentrations and fractions of Cu, Ni, Cd, Hg, Zn, Pb, and As with the Tessier sequential extraction method that were mainly found in the residual fraction (Pb 50%, As 99%). Ni …

 — The study of pollution and risk assessment of surface water in watersheds is important for the use and management of surface water, as well as for the stability of ecosystems and human health. This study …

 — As expected, the presence of bacteria resulted in increased concentrations of water-extractable Cu, Zn, Pb, Cd, and Fe in autoclaved soil compared to axenic soil (Figure Figure2 2). These results suggest that the 10 Cu/Zn-resistant isolates had metal-solubilizing potential in heavy metal-polluted soil, thereby increasing metal bioavailability.

 — The spatial distributions of Cr, Ni, Cu, Zn, As, Cd and Pb (potentially toxic elements, PTEs) in sediments and intrinsic influence factors from the Wuliangsuhai wetland of the Hetao Irrigation District, …

 — The average content of Zn, As, Pb, Cu, Cr, and Cd was 670, 424, 235, 162, 94, and 4 mg/kg, respectively, all exceeding the risk screening value of agricultural soil in China.

 — Dengjiashan, with 25 Mt at 4.77% Zn, 1.27% Pb, and 14 g/t Ag, is one of the largest SEDEX (sedimentaryexhalative) Zn–Pb sulfide deposits in the western Qinling orogenic belt, China. The ore is hosted in chert stratigraphically conformable with underlying bioclastic micrite and overlying phyllite of an intensely folded and faulted Middle ...

 — The ({T}_{r}^{i}) values for As, Cd, Cr, Cu, Hg, Pb, Ni and Zn were 10, 30, 2, 5, 40, 5, 5 and 1, respectively.. Potential sources Statistical analysis. The heavy metal concentrations were ...

 — Investigating heavy metal(oid)s (HMs) in urban soils is vital to safeguarding human life and health. This study investigated HMs in soils in urban areas of Beijing, assessed their ecological and health risks, and combined principal component analysis, geostatistical analysis, and positive definite matrix factor decomposition models to …

 — Coastal reclamation by seawall embankments and the spread of invasive C4 perennial grass Spartina alterniflora have recently become more prevalent in eastern China's coastal wetlands. While trace metals (TMs), carbon, and nitrogen dynamics concerning reclamation have extensively been explored across China's coastal …