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)
• 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 synthetical samples in the year 2020
  and are calculated from interlaboratory comparisons 2009-2019.
  



Parameter	standard deviation for proficiency assessment based on the targed value	Lower limit
Alkalinity KS 4.3 (as H+)	2.1 %	0.2 mmol/L
Ammonium	13 %	0.01 mg/L
Boron	8.6 %	0.012 mg/L
Calcium	3.3 %	9 mg/L
Chloride	3.2 %	2 mg/L
Conductivity (25°C)	1.3 %	50 µS/cm
Cyanide 1)	17 %	0.01 mg/L
DOC	6.0 %	1 mg/L
Fluoride 4)	6.9 %	0.2 mg/L
Hydrogen carbonate	2.5 %	20 mg/L
KMnO4-Index (as O2) 2)	10 %	1 mg/L
Magnesium	3.6 %	1 mg/L
Total-N 3)	-	-
Nitrate	3.4 %	2 mg/L
Nitrite	5.8 %	0.01 mg/L
Orthophosphate	10 %	0.015 mg/L
pH value 3)	-	-
Potassium	4.7 %	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	2.8 %	0.1 mmol/L
Total-P (as PO43-) 5)	11 %	0.015 mg/L


¹⁾ Easily liberatable cyanide ISO 14403-2:2012; ISO 6703-2:1984 (DIN 38405-13) in round N153
²⁾ KMnO₄-Index (EN ISO 8467) in rounds N152 and N154
³⁾ Total-N and pH value in N150 (natural samples)
⁴⁾ Total-Si (as Si) and fluoride in round N151
⁵⁾ Total-P (as PO₄^3-) (dissolved) after digestion (ISO 6878:2004)




Round	Dispatch	Organisation	Samples	Additional	Closing date
N150	11.02.2020	UBA	natural	Total-N, pH value	10.03.2020
N151	09.03.2020	IFA	synthetical	Si, F-	03.04.2020
N152	25.05.2020	IFA	synthetical	KMnO4-Index	19.06.2020
N153	31.08.2020	IFA	synthetical	Cyanide	25.09.2020
N154	09.11.2020	IFA	synthetical	KMnO4-Index	04.12.2020




• 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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