Table 1 Characterization of amphibole samples

Particle count

N (Total Particles)

561

510

588

525

N (EMP)^a

450

250

292

178

Particle number /mg

Total particles x10⁷ /mg

98.2

103

9.15

94.2

EMP ^a x10⁷ /mg

78.7

50.5

4.5

31.9

Particle size distribution

Total particle mean length (μm)

3.7 ± 0.2

2.3 ± 0.2

6.4 ± 0.6

2.1 ± 0.3

Total particle mean width (μm)

0.36 ± 0.02

0.36 ± 0.01

0.44 ± 0.01

0.43 ± 0.01

Total particle mean aspect ratio

12.8 ± 0.6

8.4 ± 0.7

16.9 ± 1.6

5.6 ± 0.6

EMP ^a mean length (μm)

4.4 ± 0.2

3.8 ± 0.3

12.1 ± 1.2

4.3 ± 0.5

EMP ^a mean width (μm)

0.30 ± 0.01

0.29 ± 0.02

0.37 ± 0.01

0.27 ± 0.01

EMP ^a mean aspect ratio

15.5 ± 0.6

15.1 ± 1.2

32.4 ± 3.0

13.0 ± 1.0

Surface area

Total surface area by GA (m²/g)^b

5.3

7.4

3.1

4.8

EMP ^a surface area by TEM (m²/g)^c

1.1

2.6

2.8

1.5

Sum of particle length

∑ (All particle lengths) x10⁶ (μm/μg)

1.02

2.89

2.15

1.68

∑ ( EMP ^a lengths) x10⁶ (μm/μg )

0.97

2.39

2.03

1.20