Table 1.
Characterization of amphibole samples
| LA2000 | LA2007 | RTI amosite | UICC amosite | |
|---|---|---|---|---|
|
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 |
a Elongated mineral particle (EMP) defined as having aspect ratio ≥ 3:1.
b Measured by Kr gas adsorption (GA) and BET analysis.
c Measured by TEM and calculated using the equation SA = [L*W + L*T + W*T]/[L*W*T*ρ] – See Methods section for detailed description.