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

This Article Abstract 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 (17) Citing Articles via Google Scholar Google Scholar Articles by Oliver, D. S. Articles by Kieft, T. L. Search for Related Content PubMed PubMed Citation Articles by Oliver, D. S. Articles by Kieft, T. L. Agricola Articles by Oliver, D. S. Articles by Kieft, T. L. Related Collections Bioremediation and Biodegradation Heavy Metals Vadose Zone Processes and Chemical Transport Ground Water Quality

Microbial Reduction of Hexavalent Chromium under Vadose Zone Conditions

^a Dep. of Earth and Environ. Sci., New Mexico Inst. of Mining and Technology, Socorro, NM 87801 (D.S. Oliver, current address: MWH, 10619 South Jordan Gateway, Salt Lake City, UT 84095)
^b Pacific Northwest National Lab., Richland, WA 99352
^c Dep. of Biology, New Mexico Inst. of Mining and Technology, Socorro, NM 87801

View larger version (36K): [in a new window]   Fig. 1. Gravimetric water contents of columns through time. Chromium(VI) and nutrients were added to the influent on Day 0. Data for Columns C2 and B2 were omitted for reasons described in text.

View larger version (22K): [in a new window]   Fig. 2. Normalized tritium breakthrough curves for Column NC2 for the two tracer tests before and after 38 d of Cr(VI) and nutrient addition. The curves shown were generated with CXTFIT2 (Toride et al., 1995) for a slug width of 1 pore volume, using parameters estimated from the actual tritium tracer data (Table 4).

View larger version (32K): [in a new window]   Fig. 3. Normalized Cr concentrations in the column effluents. Influent Cr concentrations were approximately 65 mg L-1. Full breakthrough of Cr would be expected after 5 d if no Cr loss mechanisms were operative.

View larger version (25K): [in a new window]   Fig. 4. Cumulative Cr immobilized in the columns.