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Table 6 Number of fibers in different chrysotile samples, according to size classification and induction of abnormal anaphase/telophase (from[87])

From: Quantification of short and long asbestos fibers to assess asbestos exposure: a review of fiber size toxicity

Chrysotile Lower positive concentration* (μg/cm2) or highest tested (for negative samples) Number of fibers/cm2(x 106) Number of fibers/cm2 Number of fibers/cm2
   >5 μm L (x 106) (x 106)
   < 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
  1. *Number deduced from the total number of fibers and >5 μm L; < 2 μm Ø.
  2. UICC A = UICC Chrysotile from Zimbabwe.
  3. 443 and 445 = Canadian chrysotile.
  4. SCF = Short Canadian Chrysotile SF = Superfine Chrysotile.
  5. P3 = Phosphorylated Canadian chrysotile.
  6. Pmilled = Phosphorylated and milled Canadian chrysotile.
  7. Ox89% = Leached UICC A chrysotile A treated with oxalic acid, 89% magnesium depleted.