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Table 1 Half-time (calculated from k SSA ) and lifetime (estimated from shrinking sphere/fibre models) of micro-sized particles and fibres

From: Dissolution and biodurability: Important parameters needed for risk assessment of nanomaterials

Particles/fibres Conditions k SSA Half-time Lifetime
WO3 As received (aggregated) 36.2 μm particles in artificial airway epithelial lining fluid (pH 7.4) 2.5 ± 0.3 × 10−5 g tungsten/(cm2·day) [70] 4 ± 1 daysa  
WO3 Dispersed (individual particles) 36.2 μm particles in artificial airway epithelial lining fluid (pH 7.4) 0.9 × 10−5 g tungsten/(cm2·day) [70] 11 daysa  
WO3 Mixture of 36.2 μm particles and 2.4 μm cobalt particles in artificial airway epithelial lining fluid (pH 7.4) 1.3 ± 0.4 × 10−6 g tungsten/(cm2·day) [70] 79 ± 23 daysa  
WO3 As received 36.2 μm particles in artificial lung alveolar macrophage phagolysosomal fluid (pH 4.5) 9.8 ± 2.9 × 10−9 g tungsten/(cm2·day) [70] 9893 ± 2549a  
WO3 Dispersed (individual particles) 36.2 μm particles in artificial lung alveolar macrophage phagolysosomal fluid (pH 4.5) 4.3 ± 0.4 × 10−9 g tungsten/(cm2·day) [70] 21541 ± 1890a  
WO3 Mixture of 36.2 μm particles and 2.4 μm cobalt particles in artificial lung alveolar macrophage phagolysosomal fluid (pH 4.5) 1.1 ± 0.4 × 10−9 g tungsten/(cm2·day) [70] 8052 ± 2458a  
Talc 1 μm particles 1.4 × 10−11 mol Si/(m2.s) [96]   8 yearsb
Chrysotile 1 μm fibres pH 2 to 6 at 37°C 5.9 × 10−10 mol Si/(m2.s) [108]   9 monthsb
Olivine 1 μm particles 7.6 × 10−11 mol Si/(m2.s) [96]   4.8 yearsb
Quartz 1 μm particles 1.4 × 10−13 mol Si/(m2.s) [96]   5000 yearsb
  1. aAs determined by Stefaniak [70], bas determined by Jurinski [96].