PE1041 Supelco

Minerals - WP

Proficiency Testing Material, Concentrate for dilution to 1L

  •  NACRES NA.24



Related Categories Additional Standards, Analytical Standards, Analytical/Chromatography, DMRQA PTs, Proficiency Testing,
mfr. no.   RTC, PEI-027-12
concentration   in H2O
Featured Industry   Environmental


General description

This proficiency testing sample is produced in accordance with ISO/IEC 17043:2010. All information regarding the use of this material can be found in the reporting packet supplied for each sample.


This PT sample SAMPLE 1 and SAMPLE 2 are packaged as 20 mL concentrate. The solvent for this sample is water. The PT sample has been autoclaved for preservation.

Preparation Note

Sample preparation
To prepare solution, partially fill a 1 L volumetric flask with reagent-grade water (near 20 °C).
Allow both ampules to equilibrate to room temperature and shake both samples well prior to opening. Due to lower solubility at refrigeration temperatures the sample may show precipitate. The precipitate will go back into solution once the sample warms and is shaken.
Open ampule SAMPLE 1 (be careful to avoid cuts on glass) and transfer 10.0 mL of concentrate to the volumetric flask.
Open ampule and SAMPLE 2 and transfer 10.0 mL of concentrate to the same flask.
Fill the flask to volume with reagent water.
Mix well.
The sample is now ready for immediate analysis.

Determine alkalinity and spec. cond. first. If Ca, Mg, and hardness are not to be determined during the day the sample was prepared, acidify (pH<2) an aliquot of the freshly prepared sample with nitric acid for later analysis. For other determinations, this solution is stable for at least a month if adequately stoppered.
Note: Alkalinity results may be biased if a blank correction is not applied. To compensate for the 980 mL of reagent water used to dilute the 20 mL of ampule contents, titrate an aliquot of reagent water (use the same volume as sample analysis); subtract 98% of the required titrant from that measured for the sample.
Note: Ampule 1 contains hardness, calcium, and magnesium. For these analytes ampule 1 can be diluted by itself 10 mL to 1000 mL. For all of the other analytes the above instructions must be followed.

Other Notes

Proficiency testing samples are presented as single blind. No values for the samples are released until the testing period concludes. Values of analytes vary lot to lot.

Proficiency Testing Schedule (2020-2021)

WP20-1 January 15 - February 28, 2020
WP20-2 March 25 - May 8, 2020
WP20-3A May 13 - June 26, 2020
WP20-3B July 8 - August 21, 2020
WP20-4 September 23 - November 6, 2020
WP20-5 November 25 - January 8, 2021

WP21-1 January 13 - February 26, 2021
WP21-2 March 24 - May 7, 2021
WP21-3 July 7 - August 20, 2021
WP21-4 September 22 - November 5, 2021

Quick-Turn Study - (non-scheduled proficiency test that is available at any time)



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Calcium 10-100 mg/L    
Magnesium 4-40 mg/L    
Potassium 4-40 mg/L    
Sodium 10-100 mg/L    
Alkalinity as CaCo3 25-400 mg/L    
Calcium Hardness as CaCO3 25-250 mg/L    
Hardness 40-415 mg/L    
Hardness, total as CaCO3 40-415 mg/L    
Specific conductance, Conductivity(25ºC) 200-1200 μmho per cm    
Safety & Documentation

Safety Information

NONH for all modes of transport


Certificate of Analysis (COA)

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QC1041 Minerals, certified reference material

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