NOTE: This material may be protected by copyright law (Title 17, U.S. Code).

Matocha, C.J., and D.L. Sparks. 1999. Fundamental aspects of Mn oxide reactions with catechol. SSSA Annual Meeting Abstracts,Oct. 31-Nov. 4, 1999 Salt Lake City, Utah. p. 218.


Abstract:

Oxidizable organic ligand interactions with soil Mn(III,IV) (hydr)oxides minerals are complex. Accordingly, an in situ electron paramagnetic resonance stopped-flow spectroscopic technique was combined with batch techniques to measure the reductive dissolution kinetics of birnessite (Δ-MnO2), a common soil Mn mineral, by catechol (1,2-dihydroxybenzene). The reaction was rapid, independent of pH, and essentially complete within seconds under conditions of excess catechol at pH 4 to 6. The activation energy value of 58.7 kJ mol-1 indicated that the reaction was surface chemical controlled. Rates of catechol disappearance from solution with simultaneous Mn(II) and ortho-quinone production were comparable. The efficiency and rapid reductive dissolution kinetics of birnessite by catechol could have significant implications for C and Mn cycling in soils.

Home | Members | News | Links | Research | Photos | Awards | Alumni | Publications

CONTACT MODIFICATION -->
  • Legal Notices