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Table 2 Measurements and characterization of the NP aerosols

From: Rat pulmonary responses to inhaled nano-TiO2: effect of primary particle size and agglomeration state

Experimental groups
Parameters Control 5 nm SA a 5 nm LA b 10-30 nm SA 10-30 nm LA 50 nm SA 50 nm LA
Average mass concentrationc (mg/m3) 0.05 18.77 19.30 22.04 21.99 21.38 21.94
Min and maxd (mg/m3) 0.03 and 0.27 17.12 and 22.47 17.43 and 22.18 18.83 and 27.99 20.48 and 25.42 19.66 and 25.34 20.45 and 30.09
Total particle numbere (/cm3) - 3 159 758 308 098 1 808 939 374 225 1 320 239 280 379
D25 e,f (nm) - 29 156 28 128 35 135
NMAD* or D50 e,f (nm) - 48 369 65 255 85 321
GSDg - 3.1 2.2 3.3 2.6 3.2 2.6
D75 e,f (nm) - 124 575 183 686 305 783
Fraction of NP agglomerates <100 nme (%) - 71 16 63 18 54 19
  1. a Aerosol composed of small agglomerates.
  2. b Aerosol composed of large agglomerates.
  3. c Average mass concentration determined by weight measurements.
  4. d Min and max concentration determined by a DustTrak.
  5. e Measurements made with the ELPI.
  6. f Aerodynamic diameters for which 25% (D25), 50% (D50 or NMAD) or 75% (D75) of the particles in the aerosol are smaller than this value, based on number concentration. D75 – D25 is the interquartile range and represents the size distribution where we find 50% of the particles.
  7. g GSD: geometric standard deviation.
  8. *NMAD: number median aerodynamic diameter.