Coprecipitation and redox reactions of manganese oxides with copper and nickel

Geochemistry of Peruvian near-surface sediments

“…10a). The behavior of Co strongly parallels that of Mn in seawater (e.g., Bruland, 1983) and in sediments (e.g., Hem, 1989). Co is mobilized in pore waters under suboxic conditions (Heggie and Lewis, 1984) and may diffuse out of the sediments along with Mn (Hartmann, 1964).…”

Mobility of major-, minor- and trace elements in solutions of a planosolic soil: Distribution and controlling factors

“…In various natural settings (Jenne, 1968;Carpenter et al, 1975;Robinson, 1981;Dillard et al, 1982;Lind and Hem, 1993) and in a series of laboratory experiments, many metals are closely associated with Mn oxyhydroxides, including: Zn (Balistrieri and Murray, 1986;Catts et al, 1986;Hem et al, 1987), Cu and Ni (Balistrieri et al, 1986;Hem et al, 1989), Cd (Hem et al, 1991), Pb (Catts et al, 1986); but also in deep-sea sediments (Cu, Ni, Pb and Zn) (Thomson et al, 1993), in sea water (Ni, Cu and V) (Shaw et al, 1990) and as coating on quartz (Manceau et al 2007). The importance of processes occurring at reaction sites on solid-phase surface in contact with Mn-bearing solutions has long been recognized, but these results are not observed here.…”

Heavy Metals in Petroleum‐Contaminated Surface Soils in Serbia

“…Accordingly, beside hydrous Fe-oxides, Mn-oxides and carbonates are also regarded as very important substrates of nickel in surface soil. However, "easily reducible" Mn-oxides are considered to be the dominant source of bioavailable nickel 32,33 . By comparison with the levels of this metal in uncontaminated soil (35 mg kg -1 ) 18 , samples taken in Niš (37.6-44.2 mg kg -1 , Table 2) are regarded as slightly polluted with nickel.…”