About Us | Help Videos | Contact Us | Subscriptions
 

Members of ASA, CSSA, and SSSA: Due to system upgrades, your subscriptions in the digital library will be unavailable from May 15th to May 22nd. We apologize for any inconvenience this may cause, and thank you for your patience. If you have any questions, please call our membership department at 608-273-8080.

 

Institutional Subscribers: Institutional subscription access will not be interrupted for existing subscribers who have access via IP authentication, though new subscriptions or changes will not be available during the upgrade period. For questions, please email us at: queries@dl.sciencesocieties.org or call Danielle Lynch: 608-268-4976.

Abstract

 

This article in JEQ

  1. Vol. 26 No. 4, p. 1146-1152
     
    Received: June 28, 1996


    * Corresponding author(s): mdtucke@sandia.gov
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2134/jeq1997.00472425002600040029x

Reduction and Immobilization of Molybdenum by Desulfovibrio desulfuricans

  1. Mark D. Tucker *,
  2. Larry L. Barton and
  3. Bruce M. Thomson
  1. S andia National Laboratories, Albuquerque, NM 87185;
    U niv. of New Mexico, Dep. of Biology, Albuquerque, NM 87131;
    U niv. of New Mexico, Dep. of Civil Eng., Albuquerque, NM 87131.

Abstract

Abstract

The mobility of Mo in the environment is strongly dependent on its chemical oxidation state. Under oxidizing conditions, Mo occurs as highly soluble and mobile Mo(VI) and Mo(V) compounds. However, under reducing conditions Mo usually forms insoluble Mo(IV) phases. The objective of this study was to demonstrate the ability of the sulfate-reducing bacterium, Desulfovibrio desulfuricans, to reduce Mo(VI) to Mo(IV) in anaerobic environments. Molybdenum-VI was reduced to Mo(IV) by washed cells of D. desulfuricans suspended in bicarbonate buffer solution with either lactate or H2 as the electron donor and Mo(VI) as the electron acceptor. Molybdenum-VI reduction by D. desulfuricans in the presence of sulfide resulted in the extracellular precipitation of the mineral molybdenite [MoS2(s)]. Molybdenum-VI reduction did not occur in the absence of an electron donor or in the presence of heat-killed cells of D. desulfuricans. Attempts to grow D. desulfuricans with Mo(VI) as the sole electron acceptor were unsuccessful. Direct chemical reduction of Mo(VI) by sulfide or by H2 was also unsuccessful, even when heat-killed cells of D. desulfuricans were added to provide a potential catalytic surface for the nonenzymatic reaction. Desulfovibrio vulgaris reduced Mo(VI) to Mo(IV) equally well. The results indicate that enzymatic reduction of Mo(VI) by sulfate-reducing bacteria may contribute to the accumulation of Mo(IV) in anaerobic environments and that these organisms may be useful for removing soluble Mo from contaminated water.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .