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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.