TABLE 2.
Amounts of volatile arsenic and antimony compounds produced by pure cultures of various strains after 1 week of incubation at 37°C in the dark
| Metal(loid) | Concn (mM) | Volatile speciesb | Amt (ng)a produced by:
|
|||||
|---|---|---|---|---|---|---|---|---|
| M. formicicum | M. barkeri | M. thermoautotrophicum | C. collagenovorans | D. vulgaris | D. gigas | |||
| As | 0 | AsH3 | 0.06 ± 0.04 | ND | ND | ND | ND | ND |
| MMAs | 0.06 ± 0.05 | ND | ND | ND | ND | ND | ||
| DMAs | 0.02 ± 0.001 | ND | ND | ND | ND | ND | ||
| TMAs | 0.002 ± 0.001 | ND | ND | ND | 0.002 ± 0.001 | 0.004 ± 0.002 | ||
| X | ND | ND | ND | ND | ND | ND | ||
| 0.05 | AsH3 | 1.13 ± 0.8 | 1.0 ± 0.63 | ND | ND | ND | 0.009 ± 0.002 | |
| MMAs | 8.2 ± 4.3 | ND | ND | ND | ND | ND | ||
| DMAs | 1.5 ± 0.7 | ND | ND | ND | ND | ND | ||
| TMAs | 0.5 ± 0.2 | ND | ND | 0.03 ± 0.01 | 0.01 ± 0.008 | 0.005 ± 0.003 | ||
| X | 6.4 ± 4.3 | 0.13 ± 0.08 | ND | ND | ND | ND | ||
| 0.1 | AsH3 | 6.3 ± 3.5 | 0.2 ± 0.06 | 0.073 ± 0.05 | ND | ND | ND | |
| MMAs | 14.3 ± 6.2 | ND | ND | ND | ND | ND | ||
| DMAs | 4.4 ± 3.2 | ND | ND | ND | ND | ND | ||
| TMAs | 7.2 ± 5.3 | ND | ND | 2.7 ± 1.7 | 0.004 ± 0.003 | 0.003 ± 0.002 | ||
| X | 9.4 ± 8.3 | 0.4 ± 0.3 | ND | ND | ND | ND | ||
| 0.3 | AsH3 | 9.6 ± 6.5 | 0.12 ± 0.09 | 10.4 ± 1.3 | ND | ND | ND | |
| MMAs | 9.8 ± 6.9 | ND | ND | ND | ND | ND | ||
| DMAs | 6.9 ± 4.8 | ND | ND | ND | ND | ND | ||
| TMAs | 6.9 ± 4.5 | ND | ND | 0.08 ± 0.05 | 0.001 ± 0.0006 | 0.002 ± 0.001 | ||
| X | 9.7 ± 7.4 | ND | ND | ND | ND | ND | ||
| 0.5 | AsH3 | 1.4 ± 0.6 | ND | 12.6 ± 3 | ND | ND | ND | |
| MMAs | ND | ND | ND | ND | ND | ND | ||
| DMAs | ND | ND | ND | ND | ND | ND | ||
| TMAs | ND | ND | ND | 0.04 ± 0.02 | ND | ND | ||
| X | ND | ND | ND | ND | ND | ND | ||
| Sb | 0.005 | SbH3 | 17.3 ± 10.6 | ND | ND | ND | ND | ND |
| MMSb | 1.7 ± 0.3 | ND | ND | ND | ND | ND | ||
| DMSb | 1.9 ± 0.5 | ND | ND | ND | ND | ND | ||
| TMSb | 16.1 ± 9.2 | ND | ND | ND | 0.06 ± 0.04 | ND | ||
| 0.05 | SbH3 | ND | ND | ND | ND | ND | ND | |
| MMSb | ND | ND | ND | ND | ND | ND | ||
| DMSb | ND | ND | ND | ND | ND | ND | ||
| TMSb | 8.4 ± 6.8 | ND | ND | 0.18 ± 0.07 | 0.22 ± 0.09 | ND | ||
| 0.1 | SbH3 | ND | ND | ND | ND | ND | ND | |
| MMSb | ND | ND | ND | ND | ND | ND | ||
| DMSb | ND | ND | ND | ND | ND | ND | ||
| TMSb | 7.2 ± 6.3 | ND | 0.06 ± 0.04 | 0.2 ± 0.07 | 0.08 ± 0.05 | ND | ||
| 0.3 | SbH3 | ND | ND | ND | ND | ND | ND | |
| MMSb | ND | ND | ND | ND | ND | ND | ||
| DMSb | ND | ND | ND | ND | ND | ND | ||
| TMSb | 9.5 ± 6.4 | 0.002 ± 0.001 | 0.2 ± 0.1 | 0.16 ± 0.08 | 0.07 ± 0.05 | ND | ||
| 0.5 | SbH3 | ND | ND | ND | ND | ND | ND | |
| MMSb | ND | ND | ND | ND | ND | ND | ||
| DMSb | ND | ND | ND | ND | ND | ND | ||
| TMSb | 8.9 ± 7.3 | 0.002 ± 0.001 | 0.05 ± 0.03 | ND | ND | ND | ||
a
The data shown are the mean values ± the standard deviations from at least three replicates. The amounts of the volatile species in the gas phase (70 ml) are given as absolute mass values of the respective metal(loid) in nanograms. ND, not detected.
b
X, unidentified arsenic-containing compound.