Table 1.
MPN enumeration of microorganisms capable of nitrate-dependent U(IV) biooxidation from samples collected from ORFRC sites and other sites in the continental United States
| Site and/or sample | Cells ml−1 or cells g−1 soil/sediment | Cornish-Fisher confidence limitsa | Concn range of biologically oxidized U(IV) (μM)b |
|---|---|---|---|
| Background sediment FB618 | 2,398 | 475.6–9,652 | 9.15–225 |
| Groundwater FW300 | NDc | ||
| Area 1 sediment FWB063-04-23 | 239.8 | 47.56–965.2 | 57.0–94.7 |
| Sediment FNB063-01-44 | 93.3 | 20.66–270.9 | 28.3–30.6 |
| Area 1 groundwater FW021 | 93.1 | 20.67–269.8 | 1.68–13.1 |
| Area 1 sediment FB062 | 239.8 | 47.56–965.2 | 99.5–109 |
| Area 1 sediment FB063-04-23 | 239.8 | 47.6–965.2 | 57.0–94.7 |
| Area 2 groundwater TBP16 | 427 | 103.4–1,385 | 2.03–85.0 |
| Freshwater lake sediment, Crab Orchard Lake, Carbondale, IL | 93 | 20.66–270.9 | 52.4–67.6 |
| Subsurface sediment, Longhorn, TX | 2,398 | 475.6–9,652 | 1.03–47.1 |
| Surface soil, agricultural field, Linwood, NE | 932.8 | 206.6–2,709 | 0.616–42.2 |
a
Cells ml−1 or cells g−1 soil/sediment.
b
Values are reported as concentration of biological U(VI) determined by subtracting the average U(VI) concentrations in triplicate killed controls from the U(VI) concentrations in each tube of the MPN series. Values represent the calculated minimum and maximum U(VI) concentrations. Tubes in which U(VI) concentrations did not exceed the killed-control value were recorded as zero. Non-zero values are reported.
c
ND, not detected.