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

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.

¹ Contribution from the Dep. of Plant and Soil Biology, Univ. of California, Berkeley 94720.

² Former Graduate Research Assistant and Professor of Soil Science, respectively. The senior author is presently Assistant Research Soil Scientist, Dep. of Soils and Environmental Sciences, Univ. of California, Riverside, 92521

Received for publication January 9, 1984. Accepted for publication September 4, 1984.

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