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Copper‐Manganese(II) Exchange on a Chemically Reduced Birnessite
Author(s) -
Traina S. J.,
Doner H. E.
Publication year - 1985
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1985.03615995004900020006x
Subject(s) - birnessite , chemistry , manganese , inorganic chemistry , sorption , nitrite , oxide , nuclear chemistry , redox , metal , nitrate , adsorption , manganese oxide , organic chemistry
Suspensions of a synthetic manganese oxide, birnessite, were treated with Fe(II), nitrite, glutamic acid and a water soluble sewage sludge extract, to study the effect of these reductants on Mn released by Cu sorption. In all cases, oxidation of the reductant was thought to result in a reduction of solid phase Mn(III) or Mn(IV), to Mn(II). In each instance, Mn(III) or Mn(IV) reduction was accompanied by an increase in suspension pH. In the case of the nitrite treatment, the observed ratio of Mn(II) formed to nitrate produced suggested that nitrite oxidation resulted from the reduction of Mn(IV). The production of Mn(II) and NH + 4 in the glutamic acid‐treated birnessite suspensions was attributed to direct, chemical, oxidative deamination of glutamic acid by the manganese oxide. The greatest releases of Mn(II) were observed when Cu sorption occurred subsequent to the exposure of the oxide suspensions to the reductants, but Mn(II) was also released during the simultaneous applications of the reductants and Cu. The presence of Cu always resulted in larger releases of Mn than were observed in the absence of Cu. No Mn(II) was released by Cu sorption on untreated oxide. These surface reduction and metal ion sorption reactions may be responsible for changes in Mn(II) solubility following the addition of heavy metals to soils.