HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (16) Citing Articles via Google Scholar Google Scholar Articles by Tipton, D. K. Articles by Scow, K. M. Search for Related Content PubMed PubMed Citation Articles by Tipton, D. K. Articles by Scow, K. M. GeoRef GeoRef Citation Agricola Articles by Tipton, D. K. Articles by Scow, K. M. Related Collections Bioremediation and Biodegradation

TECHNICAL REPORTS
Bioremediation and Biodegradation

Transport and Biodegradation of Perchlorate in Soils

University of California Davis, Department of Land, Air, and Water Resources, Davis, CA 95616

* Corresponding author (d_tipton{at}hotmail.com)

Received for publication July 31, 2001. Perchlorate (ClO^-₄) contamination of ground water and surface water is a widespread problem, particularly in the western United States. This study examined the effect of biodegradation on perchlorate fate and transport in soils. Solute transport experiments were conducted on two surface soils. Pulses of solution containing perchlorate and Br^- were applied to saturated soil columns at steady state water flow. Perchlorate behaved like a nonreactive tracer in Columbia loam (coarse-loamy, mixed, superactive, nonacid, thermic Oxyaquic Xerofluvent) but was degraded in Yolo loam (fine-silty, mixed, superactive, nonacid, thermic Mollic Xerofluvent). Batch experiments demonstrated that perchlorate removal from solution in Yolo loam was caused by biodegradation. Other batch experiments with Yolo loam surface and subsurface soils, Columbia loam surface soil, and dredge tailings demonstrated that perchlorate biodegradation required anaerobic conditions, an adequate carbon source, and an active perchlorate-degrading microbial population. The sequential reduction of perchlorate and NO^-₃ by an indigenous soil microbial community in Yolo loam batch systems was also studied. Nitrate reduction occurred much sooner than perchlorate reduction in soils that had not been previously exposed to perchlorate, but NO^-₃ and perchlorate were simultaneously reduced in soils previously exposed to perchlorate. The results of this study have implications for in situ remediation schemes and for agricultural soils that have been contaminated by perchlorate-tainted irrigation water.

This article has been cited by other articles:

				M. Nozawa-Inoue, K. M. Scow, and D. E. Rolston Reduction of Perchlorate and Nitrate by Microbial Communities in Vadose Soil Appl. Envir. Microbiol., July 1, 2005; 71(7): 3928 - 3934. [Abstract] [Full Text] [PDF]

				K. S. Bender, M. R. Rice, W. H. Fugate, J. D. Coates, and L. A. Achenbach Metabolic Primers for Detection of (Per)chlorate-Reducing Bacteria in the Environment and Phylogenetic Analysis of cld Gene Sequences Appl. Envir. Microbiol., September 1, 2004; 70(9): 5651 - 5658. [Abstract] [Full Text] [PDF]