Table 6.
Number of fibers in different chrysotile samples, according to size classification and induction of abnormal anaphase/telophase (from[87])
|
Chrysotile |
Lower positive concentration* (μg/cm
2
) or highest tested (for negative samples) |
Number of fibers/cm
2
(x 10
6
) |
Number of fibers/cm
2
|
Number of fibers/cm
2
|
|---|---|---|---|---|
| |
|
>5 μm L |
(x 10
6
) |
(x 10
6
) |
| < 2 μm Ø (Pott’s criteria) | <5 μm L* | (Stanton’s criteria) | ||
| “Positive” samples | ||||
| Calidria |
0.5 |
4.8 |
19.6 |
1.5 |
| NIEHS |
0.5 |
1.2 |
3.1 |
0.4 |
| UICCA |
0.5 |
0.8 |
10.2 |
0.3 |
| 4.4.3 |
1.0 |
1.1 |
15.9 |
0.3 |
| 4.4.5 |
1.0 |
1.8 |
14.2 |
1.0 |
| SF |
1.0 |
0.4 |
3.9 |
0.2 |
| P3 |
1.0 |
1.3 |
3.7 |
0.66 |
| Pmilled |
2.0 |
3.7 |
9.3 |
2.1 |
| “Negative” samples | ||||
| Ox89% |
2.0 |
0.2 |
3.7 |
0.06 |
| SCF | 1.5 | 0.66 | 21.8 | 0.22 |
*Number deduced from the total number of fibers and >5 μm L; < 2 μm Ø.
UICC A = UICC Chrysotile from Zimbabwe.
443 and 445 = Canadian chrysotile.
SCF = Short Canadian Chrysotile SF = Superfine Chrysotile.
P3 = Phosphorylated Canadian chrysotile.
Pmilled = Phosphorylated and milled Canadian chrysotile.
Ox89% = Leached UICC A chrysotile A treated with oxalic acid, 89% magnesium depleted.