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Low-Temperature Chromium(VI) Biotransformation in Soil with Varying Electron Acceptors

Department Civil, Environmental, and Architectural Engineering, Univ. of Colorado, 428 UCB, Boulder, CO 80309-0428

View larger version (26K): [in a new window]   Fig. 1. Aqueous Cr(VI) concentrations measured over time in sterilized controls with (A) low-contamination soil (LO) and (B) high-contamination soil (HI), with and without carbon addition and selected electron acceptor conditions shown.

View larger version (34K): [in a new window]   Fig. 2. Effect of electron acceptors on the aqueous Cr(VI) concentration in live vials over time shown as a percentage of the concentration measured in appropriate sterilized controls. (A) No carbon; (B) 500 mg/L sugar added.

View larger version (57K): [in a new window]   Fig. 3. Percent aqueous Cr(VI) removal measured in mixtures of high- (HI) and medium-contamination (MD) soil compared with sterilized controls. Close hatch bars represent removal observed after 9 wk, and the bars with wider hatch represent removal between 9 and 16.5 wk.

View larger version (26K): [in a new window]   Fig. 4. The Cr(VI) biotransformation rate in the presence of different electron acceptors as calculated by comparison with sterile controls.

View larger version (30K): [in a new window]   Fig. 5. Aqueous Cr(VI) reduction over time in low-contamination (LO) soil spiked with 30 mg/L of Cr(VI) and carbon under six electron acceptor conditions.

View larger version (28K): [in a new window]   Fig. 6. Aqueous Cr(VI) reduction over time in low-contamination (LO) soil spiked with carbon and 12.5 mg/L Cr(VI).

View larger version (22K): [in a new window]   Fig. 7. The Cr(VI) biotransformation rate versus aqueous Cr(VI) concentration in Cr(VI) spiked soil with carbon under three electron acceptor conditions.

View larger version (26K): [in a new window]   Fig. 8. Aqueous Cr(VI) concentrations over time as a function of variable spiked concentrations of brown sugar in mg/L to live and sterilized medium-contamination (MD) soil. (A) aerobic + N; (B) anaerobic.

View larger version (23K): [in a new window]   Fig. 9. Average dissolved organic carbon (DOC) concentration measured over time in live and sterilized vials under aerobic and anaerobic conditions. (A) 42 mg/L DOC spike; (B) 211 mg/L DOC spike.