Nickel in a serpentine-enriched Fluvisol: Redox affected dynamics and binding forms

Biogeochemistry of Ni and Pb in a periodically flooded arable soil: Fractionation and redox-induced (im)mobilization

“…It is well documented that changes from oxic to anoxic conditions could result in reductive dissolution of Fe-and Mn (hydr)oxides, upon which, fixed metals and adsorbed organic carbon might be released to soil solution (Weber et al, 2009;Shaheen et al, 2014a;Frohne et al, 2015;Schuth et al, 2015;Rinklebe et al, 2016c). It was suggested that a formation of soluble metal-DOC complexes might also control metal concentrations in soil solution at low E H (Anti c-Mladenovi c et al, 2011;Frohne et al, 2015;Rinklebe et al, 2016a). The formation of sulfides in reducing conditions should result in lower solubility of metals (Frohne et al, 2014;Shaheen et al, 2014a;Pan et al, 2014).…”

“…In the reverse sequence, oxidation of sulfides leads to a release of metals. Released metals might be again immobilized by newly formed Fe-and Mn (hydr)oxides (Contin et al, 2007;Anti c-Mladenovi c et al, 2011;Shaheen et al, 2014a,b;Rinklebe et al, 2016a). Those processes, however, might be enhanced or hindered by many factors, such as pH, DOC content and quality, and concentration of free ionic species of metals in solution (e.g.…”

“…Thus, our goal was to assess the impact of E H and governing factors, i.e., pH, Fe, Mn, Cl À , DOC, and sulfates (SO 4 2À ) on the release dynamics of Ni and Pb in a soil collected from the Velika Morava river valley (Serbia). The soil was selected due to several reasons: (i) it is representative for the area of intensive agricultural production; (ii) high total soil Ni from geogenic origin and high total soil Pb assumptive from anthropogenic origin have been reported for the area (Jakovljevi c et al, 1997;Anti cMladenovi c et al, 2011;Rinklebe et al, 2016a). In addition, the potential mobility of Ni and Pb and associated environmental risk were evaluated by the means of their partitioning in the soil solid phases of differing reactivity.…”

Microorganisms in Soils with High Nickel and Chromium Concentrations in Western Serbia

“…In our research, the effects of long-term exposure of soil microbial community to elevated Ni and Cr concentrations (values above MAC) were studied in serpentine and non-serpentine soils with a wide gradient of total Ni and Cr concentrations. Serpentine (ultramafic) soils due to naturally high concentrations of metals, particularly Ni, Cr, and Co, and low concentrations of Ca, N, P, and K represent a naturally stressed environment [24][25]. Lower microbial density and activity of serpentine areas in respect to non-serpentine outcrops have been reported previously [24].…”

Exploiting biogeochemical and spectroscopic techniques to assess the geochemical distribution and release dynamics of chromium and lead in a contaminated floodplain soil

“…Elevated levels of PTMs, including chromium (Cr) and lead (Pb) in acidic soils may increase the solubility, phytoavailability, and leaching of these metals resulting in an adverse impact on the agricultural environment (Du Laing et al, 2009;Frohne et al, 2015;Ok et al, 2011;Overesch et al, 2007;Rinklebe et al, 2016a;Shaheen and Rinklebe, 2015a,b). Pollution by Cr and Pb is a global environmental concern and a significant issue for environmental protection because Cr and Pb are toxic and potentially mobile Shaheen and Rinklebe, 2014).…”