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

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