TABLE 1.
Compiled Fe release rates from UICC crocidolite during different chemical and biological treatmentsa
| Reference | Organism/medium | Temp (°C) | Initial pH | Starting asbestos amt (g L−1) | Incubation time (days) | Initial [Fe]aq (mM) | Final [Fe]aq (mM) | Fe release rate (mM g−1 day−1) |
|---|---|---|---|---|---|---|---|---|
| 85 | Saline suspension + sodium ascorbate | 37 | 7 | 1.0 (reported as 1 mg/mL in a total of 250 mL) | 25 | 0* | 0.82 (reported as 820 μmol/g in Table 1 of the reference) | 0.03 |
| 86 | Simulated alveolar lung fluid | 37 | 4.5 | 0.1 (reported as 0.025 g in 250 mL) | 90 | 0 | 0.072 (reported as ~4,000 ppb) | 0.008 |
| This study | D. palaeochoriense/modified DSM 1210 | 60 | 6.4 | 10.0 | 2 | 0.03 | 0.14 | 0.006 |
| 29 | F. oxysporum/Czapek | 25 | 5.5 | 2.1 (reported as 50 mL of 0.023g/mL added to 500 mL cultures) | 56 | 0.03 | 0.35 (reported in Fig. 2 of the reference) | 0.003 |
| 30 | Verticillium spp./Czapek | 25 | 5.5 | 23.0 | 20 | 0* | 0.81 | 0.002 |
| 53 | Mortierella hyalina/Czapek | 25 | 5.5 | 2.0 | 45 | 0 | 0.2 (reported as nmol Fe/mg crocidolite in Fig. 5 of the reference) | 0.002 |
| 85 | Saline suspension | 37 | 7 | 1.0 | 25 | 0* | 0.023 | 0.0009 |
| 53 | Fusarium oxysporum/Czapek | 25 | 5.5 | 2.0 | 45 | 0 | 0.04 (reported as nmol Fe/mg crocidolite in Fig. 5 of the reference) | 0.0004 |
| 30 | F. oxysporum/Czapek | 25 | 5.5 | 23.0 | 20 | 0* | 0.12 | 0.0003 |
| 30 | Paecilomyces spp./Czapek | 25 | 5.5 | 23.0 | 20 | 0* | 0.11 | 0.0003 |
a
Data are organized by decreasing Fe release rates. Compiled Fe release rates are expressed as millimolar concentrations per gram of crocidolite initially provided per day. Initial dissolved [Fe] values marked with an asterisk are assumed values, as data are not available from the reference. Data obtained in this study and values for Fe release rates are shaded.