Major Ions
- Two samples on different concentration levels
- Two bottles (2 x 500 mL) per sample
- Natural samples: one ground water sample, one surface water sample (partly fortified)
Details: UBA and Annual Programme 2022.
- Synthetic samples (IFA): Concentration comparable to ground and surface water, more details can be found here.
- The specified standard deviations for proficiency assessment (z-score-criteria in %) and lower limits apply to synthetic samples in the year 2022
and are calculated from interlaboratory comparisons 2011-2021. At regular intervals the standard deviations are recalculated and updated.
| Parameter |
standard deviation for proficiency assessment
based on the targed value |
Lower limit |
|---|
| Alkalinity KS 4.3 (as H+) |
2.0 % |
0.2 mmol/L |
| Ammonium |
12 % |
0.01 mg/L |
| Boron |
7.5 % |
0.012 mg/L |
| Calcium |
3.3 % |
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 |
5.6 % |
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 |
3.7 % |
1 mg/L |
| Total-N 3) |
- |
- |
| Nitrate |
3.2 % |
2 mg/L |
| Nitrite |
5.6 % |
0.01 mg/L |
| Orthophosphate |
10 % |
0.015 mg/L |
| pH value 3) |
- |
- |
| Potassium |
4.4 % |
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 |
2.9 % |
0.1 mmol/L |
| Total-P (as PO43-) 5) |
10 % |
0.015 mg/L |
1) Easily liberatable cyanide ISO 14403-2:2012; ISO 6703-2:1984 (DIN 38405-13) in round N163
2) KMnO4-Index (EN ISO 8467) in rounds N162 and N164
3) Total-N and pH value in N160 (natural samples)
4) Total-Si (as Si) and fluoride in round N161
5) Total-P (as PO43-) (dissolved) after digestion (ISO 6878:2004)
| Round |
Dispatch |
Organisation |
Samples |
Additional |
Closing date |
| N160 |
new: 29.03.2022 ➨ |
UBA |
natural |
Total-N, pH value |
26.04.2022 |
| N161 |
07.03.2022 |
IFA |
synthetic |
Si, F- |
01.04.2022 |
| N162 |
16.05.2022 |
IFA |
synthetic |
KMnO4-Index |
17.06.2022 |
| N163 |
05.09.2022 |
IFA |
synthetic |
Cyanide |
30.09.2022 |
| N164 |
14.11.2022 |
IFA |
synthetic |
KMnO4-Index |
09.12.2022 |
➨Please note the changed dipatch date due to COVID-19.
(modification: January 12, 2022; The originally planned shipping date was February 8th, 2022)
- Contact IFA:
Uta Kachelmeier, Ing.
Phone: +43(0) 1 47654 97361
- Contact UBA:
Martha Schmid, MSc.
Phone: +43(0) 1 31304 4334
Data evaluation