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 2021.
• Synthetic samples (IFA): Concentration comparable to ground and surface water, more details on request
• The specified standard deviations for proficiency assessment (z-score-criteria in %) and lower limits apply to synthetic samples in the year 2021 and are calculated from interlaboratory comparisons 2010-2020. 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	7.8 %	0.012 mg/L
Calcium	3.3 %	9 mg/L
Chloride	3.0 %	2 mg/L
Conductivity (25°C)	1.3 %	50 µS/cm
Cyanide 1)	16 %	0.01 mg/L
DOC	5.9 %	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	3.3 %	2 mg/L
Nitrite	6.1 %	0.01 mg/L
Orthophosphate	10 %	0.015 mg/L
pH value 3)	-	-
Potassium	4.5 %	0.5 mg/L
Silicon 4)	5.0 %	0.9 mg/L
Sodium	3.4 %	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 N158
²⁾ KMnO₄-Index (EN ISO 8467) in rounds N157 and N159
³⁾ Total-N and pH value in N155 (natural samples)
⁴⁾ Total-Si (as Si) and fluoride in round N156
⁵⁾ Total-P (as PO₄^3-) (dissolved) after digestion (ISO 6878:2004)




Round	Dispatch	Organisation	Samples	Additional	Closing date
N155	09.02.2021	UBA	natural	Total-N, pH value	09.03.2021
N156	08.03.2021	IFA	synthetic	Si, F-	09.04.2021
N157	17.05.2021	IFA	synthetic	KMnO4-Index	11.06.2021
N158	06.09.2021	IFA	synthetic	Cyanide	01.10.2021
N159	08.11.2021	IFA	synthetic	KMnO4-Index	03.12.2021




• Contact IFA: Uta Kachelmeier, Ing.
  Phone: +43(0) 1 47654 97361
• Contact UBA: Martha Schmid, MSc.
  Phone: +43(0) 1 31304 4334

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