Abstract
Laboratory data in Cu2+ adsorption by chernozems and parent rocks in Rostov region show that adsorption isotherms can be approximated by the Langmuir equation, whose parameters (Kl and C∞) were calculated for all of the samples. The values of C∞ show a strong negative correlation with the values of cationexchange capacity (CEC) (r =–0.88 at Р = 0.95), and Kl is correlated with the content of physical clay (particles <0.01 mm) (r = 0.78) and with clay (particles <0.001 mm) content in ordinary chernozem and southern chernozems of various particle size distribution (r = 0.80). Even stronger correlations were detected between these parameters in southern chernozems (r = 0.89 for the physical clay (PC) and r = 0.91 for the silt). However, none of the samples displays a significant correlation of C∞ and Kl with the contents of physical clay and silt. This led us to conclude that the composition of the samples, for example, their organic matter, can affect Cu2+ adsorption by the soils and parent rocks. Acidification mechanisms of the equilibrium solutions during the Cu2+ adsorption by soils are discussed, as also are the reasons for the absence of balance between Cu2+ adsorbed by soils and exchangeable cations transferred into solution. Analysis of the fine structures of the XANES and EXAFS spectra suggests that Cu2+ can form coordinated chelate complex compounds with humic acids (HA) of soils and can substitute Al3+ at octahedral sites when interacting with clay minerals in soils.
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Original Russian Text © D.L. Pinskii, T.M. Minkina, T.V. Bauer, D.G. Nevidomskaya, S.S. Mandzhieva, M.V. Burachevskaya, 2018, published in Geokhimiya, 2018, No. 3, pp. 280–289.
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Pinskii, D.L., Minkina, T.M., Bauer, T.V. et al. Copper Adsorption by Chernozem Soils and Parent Rocks in Southern Russia. Geochem. Int. 56, 266–275 (2018). https://doi.org/10.1134/S0016702918030072
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DOI: https://doi.org/10.1134/S0016702918030072