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Minerals - WP

Proficiency Testing Material, Concentrate for dilution to 1L


Quality Level


ampule of 4 × 20 mL


in water




matrix material

General description

Minerals - WP proficiency testing material is produced in accordance with ISO/IEC 17043:2010. Also referred to as non-Potable Water or Water Pollution sample, this product is produced according to TNI requirements. However, please note, this sample may include non-TNI analytes as well. The higher criteria from the TNI tables mimic the levels common to wastewater samples. The PT portfolio allows our test components to offer significant performance data to monitor and prove competency to customers, accreditation bodies or both.

Supelco® is a global proficiency testing (PT) provider that manufactures best-in-class environmental and pharmaceutical PT products. Most water PT samples are available as concentrates or ready-to-use volumes giving the end-user flexibility in selecting samples that will fit their exact needs. Our WP program is designed to meet the quality assurance requirements in compliance with Discharge Monitoring Report - Quality Assurance Program (DMR-QA), thereby ensuring the analytical competence of your laboratory.
These samples are typically provided in duplicate for use in case of lab mishap, for QC purposes, or to analyze multiple methods.

Type of PT Scheme: Water analysis - Water Pollution (WP)

Matrix: Water Pollution/Wastewater

Analyte/s: Values of analytes vary lot to lot.

All information regarding the use of Minerals - WP can be found in the reporting packet which will be available to download at PT Portal.


Minerals - WP is an inorganic non-potable water (NPW) PT standard, suitable for testing WP minerals in water pollution/wastewater.

Have any questions? Explore our FAQs.
For more information on this product, please contact our PT Service Team.

Features and Benefits

We have a vast portfolio of environmental PT schemes with "fit-for-purpose" samples to help you meet the needs of the laboratory.

Our proficiency testing (PT) program is a benchmark to:

  • provide staff with an insight into their laboratory′s performance, to verify the accuracy and reliability of their testing process
  • provide a comparison of performance with that of other laboratories, nationally and internationally
  • test and educate staff, provide a better understanding of the impact of incorrect results and identify areas where there may be problems
  • provide an independent evaluation of laboratory performance
  • demonstrate to clients, colleagues and accreditation bodies that there is a commitment to quality


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


  • This PT sample is packaged as 2x20 mL concentrates.
  • The solvent for this sample is water.
  • The PT sample has been autoclaved for preservation.

Sample Preparation

  • To prepare solution, partially fill a 1 L volumetric flask with reagent-grade water (near 20 ºC).
  • Allow both ampules to equilibrate to room temperature and shake both samples well prior 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 SAMPLE 2 and transfer 10.0mL 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.

Storage and Stability

Please refer to sample label for expiration date, specific storage temperature and specific storage conditions.

Other Notes

Are you new to Supelco® Proficiency TestingͰ Be sure to register your account details in the PT Portal before placing your order.
This will provide access to data entry, reporting packets and final reports. Registrations will be approved shortly after your order is placed. For further questions, write to us at

When placing your order online, please indicate your study preference under the ′your reference′ column. Available studies can be viewed at the bottom of the page.
Click here to learn more about Quick-Turn Studies (on-demand proficiency tests that are offered depending on lot availability). The Quick-Turn results are released within 48-72 hours whereas scheduled study reports are released within 21 days.

Proficiency testing samples are presented as single blind. No values for the samples are released until the testing period concludes.

Proficiency Testing Schedule (2022-2023)

WP22-1 January 12 – February 25, 2022
WP22-2 March 23 - May 6, 2022
WP22-3 July 6 - August 19, 2022
WP22-4 September 21 - November 4, 2022

WP23-1 January 11 – February 24, 2023
WP23-2 March 22 – May 5, 2023
WP23-3 July 5 – August 18, 2023
WP23-4 September 20 – November 3, 2023

Quick-Turn Study (on demand proficiency test that is offereddepending on lot availability)

Legal Information

Supelco is a registered trademark of Merck KGaA, Darmstadt, Germany



    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
    See All (9)

Storage Class Code

10 - Combustible liquids



Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Origin

Enter Lot Number to search for Certificate of Origin (COO).

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