Parameter | Proficiency testing item M174A | Uncertainty | Proficiency testing item M174B | Uncertainty | Unit |
Aluminium | 18.8 | 0.3 | 38.0 | 0.4 | µg/L |
Antimony | 1.210 | 0.018 | 0.445 | 0.015 | µg/L |
Arsenic | 5.02 | 0.03 | 1.804 | 0.015 | µg/L |
Barium | 25.06 | 0.13 | 60.3 | 0.2 | µg/L |
Lead | 2.79 | 0.03 | 7.08 | 0.04 | µg/L |
Cadmium | 0.398 | 0.006 | 1.030 | 0.011 | µg/L |
Chromium | 0.795 | 0.010 | 5.26 | 0.03 | µg/L |
Iron | 33.9 | 0.4 | 83.8 | 0.5 | µg/L |
Copper | 4.63 | 0.04 | 1.19 | 0.03 | µg/L |
Manganese | 8.57 | 0.14 | 21.92 | 0.18 | µg/L |
Molydenum | 1.48 | 0.05 | 4.89 | 0.06 | µg/L |
Nickel | 2.84 | 0.03 | 3.63 | 0.03 | µg/L |
Selenium | 0.936 | 0.018 | 2.31 | 0.02 | µg/L |
Strontium | 339 | 3 | 864 | 8 | µg/L |
Uranium | 1.723 | 0.015 | 4.23 | 0.03 | µg/L |
Zinc | 28.7 | 2.5 | 57 | 2 | µg/L |
Tin | 1.89 | 0.03 | 0.74 | 0.02 | µg/L |