Elements | Certified values (µg∙cm−2) | Found values (µg∙cm−2) | Limit of detection (ng∙m−3) |
Al | 2.33 ± 0.05 | 2.8 ± 0.4 | 0.04 |
Si | Not certified (reference value, 5.9 ± 0.2) | 6.4 ± 0.2 | 0.03 |
S | Not certified (reference value, 0.11 ± 0.03) | 0.14 ± 0.04 | 0.01 |
Cl | ND | 0.26 ± 0.03 | 0.006 |
K | 0.53 ± 0.05 | 0.53 ± 0.01 | 0.003 |
Ca | 1.3 ± 0.2 | 1.35 ± 0.03 | 0.003 |
Ti | 0.15 ± 0.02 | 0.15 ± 0.02 | 0.002 |
Fe | 2.7 ± 0.2 | 2.73 ± 0.04 | 0.02 |
Zn | 0.18 ± 0.01 | 0.18 ± 0.01 | 0.06 |
V | 0.005 ± 0.001 | 0.002 ± 0.002 | 0.04 |
Cr | 0.014 ± 0.003 | 0.015 ± 0.003 | 0.01 |
Mn | 0.032 ± 0.001 | 0.035 ± 0.003 | 0.02 |
Ni | 0.007 ± 0.001 | 0.005 ± 0.002 | 0.04 |
Cu | 0.040 ± 0.004 | 0.044 ± 0.003 | 0.01 |
As | 0.0012 ± 0.0001 | | ND |
Pb | 0.03 ± 0.01 | 0.02 ± 0.01 | 0.02 |