Parameter | standard deviation for proficiency assessment based on the target value |
Lower limit |
---|---|---|
Alkalinity KS 4.3 (as H+) | 1.9 % | 0.2 mmol/L |
Ammonium | 11 % | 0.01 mg/L |
Boron | 7.3 % | 0.012 mg/L |
Calcium | 3.2 % | 9 mg/L |
Chloride | 2.9 % | 2 mg/L |
Conductivity (25°C) | 1.2 % | 50 µS/cm |
Cyanide 1) | 16 % | 0.01 mg/L |
DOC | 5.4 % | 1 mg/L |
Fluoride 4) | 7.0 % | 0.2 mg/L |
Hydrogen carbonate | 2.4 % | 20 mg/L |
KMnO4-Index (as O2) 2) | 10 % | 1 mg/L |
Magnesium | 3.5 % | 1 mg/L |
Total-N 3) | - | - |
Nitrate | 3.1 % | 2 mg/L |
Nitrite | 5.4 % | 0.01 mg/L |
Orthophosphate | 9.5 % | 0.015 mg/L |
pH value 3) | - | - |
Potassium | 4.3 % | 0.5 mg/L |
Silicon 4) | 4.6 % | 0.9 mg/L |
Sodium | 3.2 % | 1 mg/L |
Sulphate | 3.1 % | 3 mg/L |
Total hardness | 2.8 % | 0.1 mmol/L |
Total-P (as PO43-) 5) | 9.4 % | 0.015 mg/L |
Round | Dispatch | Organisation | Samples | Additional | Closing date |
---|---|---|---|---|---|
N165 | 07.02.2023 | UBA | natural | Total-N, pH value | 07.03.2023 |
N166 | 06.03.2023 | IFA | synthetic | Si, F- | 31.03.2023 |
N167 | 22.05.2023 | IFA | synthetic | KMnO4-Index | 23.06.2023 |
N168 | 04.09.2023 | IFA | synthetic | Cyanide, Si, F- | 29.09.2023 |
N169 | 06.11.2023 | IFA | synthetic | KMnO4-Index | 01.12.2023 |