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Table 2 Results of gravimetric determination of test atmosphere concentration and particle size distribution

From: Comparative inhalation toxicity of multi-wall carbon nanotubes, graphene, graphite nanoplatelets and low surface carbon black

MWCNT     
Target concentration (mg/m3)   0.1 0.5 2.5
Measured concentration (mg/m3 ± SD)   0.15 ± 0.05 0.57 ± 0.10 2.86 ± 0.82
MMAD (μm)   1.1/1.7 1.3/0.9 2.0/1.2
GSD   3.7/3.0 3.7/3.8 3.0/3.5
OPC Count median diameter (μm) 0.494 0.499 0.533
Count concentration (N/cm3) 70 405 724
SMPS Count median diameter (μm) 0.145 0.096 0.127
Count concentration (N/cm3) 1072 5636 4410
Graphene     
Target concentration (mg/m3)   0.5 2.5 10.0
Measured concentration (mg/m3 ± SD)   0.54 ± 0.04 3.05 ± 1.05 10.1 ± 4.5
MMAD (μm)*   ≤ 0.4 < 0.4 < 0.4
OPC Count median diameter (μm) 0.473 0.977 0.656
Count concentration (N/cm3) 57 191 343
SMPS Count median diameter (μm) 0.102 0.436 0.508
Count concentration (N/cm3) 269 98 226
Graphite nanoplatelets     
Target concentration (mg/m3)   0.5 2.5 10
Measured concentration (mg/m3 ± SD)   0.46 ± 0.11 2.08 ± 0.33 10.27 ± 1.44
MMAD (μm)   1.7/1.6 2.1/2.3 2.7/3.4
GSD   2.4/2.2 2.8/2.5 2.7/2.5
OPC Count median diameter (μm) 0.373 0.373 0.360
Count concentration (N/cm3) 458 1828 7401
SMPS Count median diameter (μm) 0.123 0.146 0.148
Count concentration (N/cm3) 2819 9893 35606
Carbon Black     
Target concentration (mg/m3)   0.5 2.5 10
Measured concentration (mg/m3 ± SD)   0.5 ± 0.1 2.5 ± 0.2 10.9 ± 1.5
MMAD (μm)/GSD   0.9/0.8 0.6/0.7 0.9/0.6
GSD   2.7/2.1 3.6/3.1 4.5/2.7
OPC Count median diameter (μm) 0.40 0.38 0.38
Count concentration (N/cm3) 1231 7418 35829
SMPS Count median diameter (μm) 0.24 0.22 0.23
Count concentration (N/cm3) 21138 122097 371078
  1. OPC Optical Particle Counter, SMPS Scanning Mobility Particle Sizer.
  2. * GSD could not be determined (majority below the smallest impactor stage).