Nov 1, 2000 · The most important cationic components in the filtrate were Na, K, Zn, Cu, Pb and Cd. Although PbCl 2 is quite insoluble (K s =4.77), its concentration in the soluble phase is similar to the concentration of copper or cadmium. The pH of the filtrate was around 6. To avoid precipitation of hydroxides, the pH was decreased by adding HCl (Fluka ...
Читать далееJun 1, 2015 · Jiang et al. (2013) concluded that this procedure consisted of four steps: First, the distribution histograms of metal concentrations (Cu, Pb, Zn, Ni, and Al) were plotted to remove the outliers, and thus to reduce the original data set to a relatively clean data set. The distribution histograms of Cu, Pb, Zn, Ni, and Al were shown in Fig. 2.
Читать далееAug 13, 2020 · The aim of the present study is to investigate the bioaccumulation and translocation of various heavy metals, notably copper, zinc, cadmium and lead, in the different plant organs of Trapa natans L. (the root, stem, and leaf) at nine sampling locations, as well as examining the variability in proline accumulation and chlorophyll content due to these heavy …
Читать далееMar 15, 2008 · However, low K d values were shown for Zn (0.17–118 L kg − 1), Ni (0.08–163 L kg − 1) and Cd (0.04–45 L kg − 1). On the basis of the K d values, the most common selectivity sequence of the metal adsorption is Pb > Cu > Zn > Ni > Cd, which it is related to the first hydrolysis equilibrium constant. Generally, the simple correlation ...
Читать далееAug 20, 2021 · The variation in δ 65 Cu AE647 (δ 65 Cu max-min) was larger than that of δ 66 Zn IRMM3702 (i.e., δ 66 Zn max-min), and the isotope values of Zn and Pb (206 Pb/ 207 Pb) tended to increase with the concentrations of these elements. Meanwhile, the fine RDS particles (< 63 µm) had similar Cu, Zn, and Pb isotopic compositions to those of TSS.
Читать далееJun 1, 2020 · The study aims to investigate effect of earthworm activity on metal bioavailability in soils using their BSAF-metals. Based on a microcosmic laboratory experiment, epigeic species Amynthas corticis (A. corticis) and endogeic species Amynthas robustus (A. robustus) were cultured in two types of soils contaminated by Cd, Zn, Pb and Cu for 120 days. . Earthworm …
Читать далееDec 1, 2019 · In the western Yangtze Block, South China (Fig. 1 a), there are >400 Pb-Zn deposits hosted in late Ediacaran to middle Permian carbonate rocks (e.g. Zhou et al., 2013a, Wang et al., 2014, Zhang et al., 2015), which form the giant Upper Yangtze Pb-Zn metallogenic province (Zhou et al., 2018a).Although the mineralization style of these Pb-Zn deposits is …
Читать далееOct 11, 2012 · The protonation and complex formation equilibria of two biodegradable aminopolycarboxylate chelants {dl-2-(2-carboxymethyl)nitrilotriacetic acid (GLDA) and 3-hydroxy-2,2′-iminodisuccinic acid (HIDS)} with Ni 2+, Cu 2+, Zn 2+, Cd 2+ and Pb 2+ ions were investigated using the potentiometric method at a constant ionic strength of I = 0.10 mol·dm −3 …
Читать далееКазахстан расположит в Евразии и её площадь занимает девятое…
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