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Abstract

 

This article in SSSAJ

  1. Vol. 49 No. 2, p. 307-313
     
    Received: Jan 9, 1984
    Accepted: Sept 4, 1984


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doi:10.2136/sssaj1985.03615995004900020006x

Copper-Manganese(II) Exchange on a Chemically Reduced Birnessite1

  1. S. J. Traina and
  2. H. E. Doner2

Abstract

Abstract

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.

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