AQUA-1: Drinking water Certified Reference Material for trace metals and other constituents
The following tables show those constituents for which certified, reference and information values have been established for this river water certified reference material (CRM).
The expanded uncertainty (UCRM) in the certified value is equal to U = kuc where uc is the combined standard uncertainty calculated according to the JCGM Guide  and k is the coverage factor. A coverage factor of two (2) was applied for all elements. It is intended that UCRM accounts for every aspect that reasonably contributes to the uncertainty of the measurement. The density of AQUA-1 is 0.9991 g/mL at 21 oC.
|International recognition of
measurement capability (CMC)
|aluminium (b,c,d)||54.7 ± 1.6||54.6 ± 1.6||TEW01|
|antimony (a,b)||0.0683 ± 0.0056||0.0682 ± 0.0056||TEW02|
|arsenic (b,c)||0.222 ± 0.014||0.222 ± 0.014||TEW03|
|barium (a,b,c,d)||11.90 ± 0.36||11.89 ± 0.36||TEW04|
|cadmium (a,b)||0.0044 ± 0.0014||0.0043 ± 0.0014||TEW06|
|calcium (c,d)||8250 ± 140||8240 ± 140||TEW32|
|chromium (a,b,c)||0.087 ± 0.008||0.087 ± 0.008||TEW07|
|cobalt (b,c)||0.0271 ± 0.0028||0.0271 ± 0.0028||TEW08|
|copper (a,b,c,d)||7.46 ± 0.12||7.46 ± 0.12||TEW09|
|iron (a,b,c,d)||38.0 ± 1.2||38.0 ± 1.2||TEW10|
|lead (a,b,c)||1.365 ± 0.034||1.364 ± 0.034||TEW11|
|magnesium (a,c,d)||1945 ± 40||1944 ± 40||TEW34|
|manganese (b,c,d)||2.43 ± 0.08||2.42 ± 0.08||TEW12|
|molybdenum (a,b)||0.189 ± 0.008||0.189 ± 0.008||TEW13|
|nickel (a,b,c,d)||0.447 ± 0.030||0.447 ± 0.030||TEW14|
|potassium (b,c,d)||670 ± 10||670 ± 10||TEW33|
|sodium (b,c,d)||13 730 ± 340||13 710 ± 340||TEW35|
|strontium (a,b,c,d)||36.05 ± 0.48||36.02 ± 0.48||TEW15|
|uranium (a,b)||0.006 96 ± 0.000 52||0.006 95 ± 0.000 52||TEW16|
|vanadium (a,b,c)||0.152 ± 0.008||0.152 ± 0.008||TEW17|
|zinc (a,b,c)||0.97 ± 0.08||0.97 ± 0.08||TEW18|
|inorganic arsenic (e)||0.124||0.124|
|monomethylarsenic (as As) (e)||0.036||0.036|
|dimethylarsenic (as As) (e)||0.028||0.028|
|trimethylarsenic (as As) (e)||0.010||0.010|
The coding refers to the instrumental method of analyte determination.
- a - Isotope dilution inductively-coupled plasma mass spectrometry (ID-ICP-MS)
- b - Standard addition inductively-coupled plasma mass spectrometry (SA-ICP-MS)
- c - Inductively-coupled plasma mass spectrometry (ICP-MS)
- d - Standard addition inductively-coupled plasma atomic emission spectroscopy (SA-ICP-AES)
- e - Hydride generation ICP-MS
This certified reference material is primarily intended for use in the calibration of procedures and the development of methods used for the analysis of water for trace metals. A minimum sample volume of 10 mL is recommended.
Storage and sampling
It is recommended that the material be stored at +4 oC temperature. The bottles should be opened only in a clean area with precautions taken against contamination during sampling.
Included in the overall combined uncertainty estimate (uc) are uncertainties in the batch characterization (u,char), uncertainties related to possible between-bottle variation (uhom), and uncertainties related to inconsistency between the various measurement methods (umethod). Expressed as standard uncertainties, these components are listed in Table 3.
|uranium||0.000 26||0.000 22||0.000 14||0.000 00|
Date of issue: January 2017
Date of expiry: January 2022
Revised: January 2018 (Al, Ba, Mn data and acknowledgements section updated)
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