Table 4.
Comparison of mean hair trace metal levels (mg·kg−1, dry weight) from the present study with those reported for other regions of the world.
| Country/Region | As | Cd | Cr | Cu | Ni | Pb | Zn | |
|---|---|---|---|---|---|---|---|---|
| Canada [40] | 0.016 | 0.503 | 0.35 | 63.1 | 0.26 | 5.38 | 248 | |
| USA [40] | 0.019 | 0.97 | 0.234 | 108 | 1.01 | 5.35 | 124 | |
| Japan [40] | 0.053 | 0.28 | 0.23 | 10.7 | 2.7 | 3.62 | 114 | |
| Guangdong in China (Adults) [41] | 0.77 | 0.052 | 0.34 | NR | 0.44 | 5.56 | NR | |
| Ningbo in China [42] | 0.282 | 0.209 | 1.16 | 10.7 | 0.812 | 2.98 | NR | |
| Normal reference value by TERCC [43] | Adults | 1.0 | 0.6 | 0.30–1.20 | 8.0–20.0 | NR | 10 | 120–210 |
| Children | 1.0 | 0.5 | 0.18–0.72 | 8.0–16.0 | NR | 10 | 90–170 | |
NR: not recommended. TERCC: Trace Element Research Council of China.