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Rates of Microbially Mediated Arsenate Reduction and Solubilization

Dep. of Land Resources and Environ. Sci., Montana State Univ., Bozeman, MT 59717 USA

View larger version (29K): [in a new window]   Fig. 1 Extent of As(V) reduced (A, B) and growth curves (C, D) vs. time for a range of initial As(V) concentrations in serum bottles inoculated with either CN-0 or CN-8. Glucose concentration was 5 mM for each treatment. Experiment with CN-0 and an initial As(V) concentration of 600 µM was conducted in duplicate and error bars denote one standard deviation about the mean. Error bars smaller than symbols are not shown. As(V) reduced (%) = 100[1 - (AsV/AsT)]

View larger version (30K): [in a new window]   Fig. 2 Extent of As(V) reduction as a function of optical density in serum bottles inoculated with either CN-0 or CN-8. Data for symbols connected by dashed lines were collected after the growth phase (Fig. 1). Experiments with initial As(V) concentrations of 600 µM were conducted in duplicate and error bars denote one standard deviation about the mean. Error bars smaller than symbols are not shown. As(V) reduced (%) = 100[1 - (AsV/AsT)]

View larger version (22K): [in a new window]   Fig. 3 Effect of initial As(V) concentration on As(V) reduction rate in serum bottles inoculated with CN-0 or CN-8 at initial glucose concentrations of 5 mM. Rates of As(V) reduction for two environmental isolates from other studies are shown for comparison. Experiments with initial As(V) concentrations of 600 µM were replicated (triplicates on CN-8, duplicates on CN-0) and error bars denote one standard deviation about the mean. Error bar for CN-0 is smaller than symbol

View larger version (20K): [in a new window]   Fig. 4 Microbial biomass and As(V) concentrations versus time for a representative As treatment (60 µM) inoculated with CN-8. The fitted microbial growth curve was generated assuming first order kinetics (dX/dt = kX) until a maximum of X = 2.7 mM C was reached. The solved expression for X was substituted into the As(V) reduction model (see Eq. [1]) and the As(V) reduction curve generated by optimizing k1

View larger version (24K): [in a new window]   Fig. 5 Concentrations of aqueous As(T), As(V), and As(Ill) vs. time as Pt electrode EH decreased in a stirred goethite suspension with a high As:Fe molar ratio (0.04). Suspension was inoculated with a CN-0 population on day 3 and N2(g) replaced O2(g) on Day 4 to promote reduction. Sulfide levels ranged from 5 x 10-6 to 8 x 10-5 M

View larger version (25K): [in a new window]   Fig. 6 Concentrations of aqueous As(T), As(V), and As(III) versus time as Pt electrode EH decreased in a stirred goethite suspension with a low As:Fe molar ratio (5.3 x 10-4). Suspension was inoculated with a CN-0 population on Day 2 and N2(g) replaced O2(g) on Day 3 to promote reduction

View larger version (33K): [in a new window]   Fig. 7 Effect of decreased Pt electrode EH (A) on As and Fe concentrations (B) in a stirred ferrihydrite suspension at an As:Fe molar ratio of 0.012. Suspension was inoculated with a CN-0 population on Day 4 and N2(g) replaced O2(g) on Day 5 to promote reduction