Parameter | standard deviation for proficiency assessment based on the target value |
Lower limit |
---|---|---|
Alkalinity KS 4.3 (as H+) | 1.8 % | 0.2 mmol/L |
Ammonium | 11 % | 0.01 mg/L |
Boron | 7.1 % | 0.012 mg/L |
Calcium | 3.1 % | 9 mg/L |
Chloride | 2.7 % | 2 mg/L |
Conductivity (25°C) | 1.2 % | 50 µS/cm |
Cyanide 1) | 15 % | 0.01 mg/L |
DOC | 5.4 % | 1 mg/L |
Fluoride 4) | 7.2 % | 0.2 mg/L |
Hydrogen carbonate | 2.3 % | 20 mg/L |
KMnO4-Index (as O2) 2) | 8.2 % | 1 mg/L |
Magnesium | 3.5 % | 1 mg/L |
Total-N 3) | - | - |
Nitrate | 3.0 % | 2 mg/L |
Nitrite | 5.5 % | 0.01 mg/L |
Orthophosphate | 9.2 % | 0.015 mg/L |
pH value 3) | - | - |
Potassium | 4.0 % | 0.5 mg/L |
Silicon 4) | 4.8 % | 0.9 mg/L |
Sodium | 3.1 % | 1 mg/L |
Sulphate | 3.0 % | 3 mg/L |
Total hardness | 2.8 % | 0.1 mmol/L |
Total-P (as PO43-) 5) | 9.1 % | 0.015 mg/L |
Round | Registration deadline | Dispatch | Organisation | Samples | Additional | Closing date |
---|---|---|---|---|---|---|
N170 | 23.01.2024*) | 06.02.2024 | UBA | natural | Total-N, pH value | 05.03.2024 |
N171 | 04.03.2024 *) | 18.03.2024 | IFA | synthetic | Si, F- | 19.04.2024 |
N172 | 17.05.2024 *) | 03.06.2024 | IFA | synthetic | KMnO4-Index | 28.06.2024 |
N173 | 19.08.2024 *) | 02.09.2024 | IFA | synthetic | Cyanide, Si, F- | 27.09.2024 |
N174 | 28.10.2024 *) | 11.11.2024 | IFA | synthetic | KMnO4-Index | 06.12.2024 |