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Trace metals detected in MWCNTs used in this study (ND: not detected)
| Element | CNT-S (ppm) | CNT-L (ppm) | Detection limit (ppm) |
|---|---|---|---|
| Na | ND | 40 | 20 |
| Mg | ND | 300 | 10 |
| Al | ND | 30 | 10 |
| Ca | 30 | 100 | 20 |
| Cr | ND | 400 | 10 |
| Mn | ND | 30 | 10 |
| Fe | 50 | 2,000 | 10 |
| Co | 30 | 10 | 10 |
| Ni | 4,000 | 2,000 | 10 |
| Mo | 50 | 15,000 | 10 |
| La | 20 | 10 | 10 |
