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Anions - WS

Proficiency Testing Material, (Concentrate for dilution to 500 mL)

WS - Anions

Nivel de calidad


ampule of 2 × 20 mL


in water




matrix material

Descripción general

Anions - WS proficiency testing material is produced in accordance with ISO/IEC 17043:2010. Also referred to as Potable Water or Water Supply sample, this sample is produced according to TNI requirements. However, please note, this sample may include non-TNI analytes as well. The lower criteria from the TNI tables mimic the levels common to drinking water 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. Our WS program is designed to meet the quality assurance requirements in compliance with Safe Drinking Water Act (SDWA), thereby ensuring the analytical competence of your laboratory or drinking water facility.
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 Supply (WS)

Matrix: Water Supply/Drinking water

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

All information regarding the use of Anions - WS Proficiency Testing standard can be found in the reporting packet which will be available to download at PT Portal.


Anions - WS proficiency testing material is suitable for testing the anions in water supply/drinking water.

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


20 mL

Características y beneficios

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

Nota de preparación


  • This PT sample is packaged as a 20 mL concentrate.
  • The solvent for this sample is water.
  • The PT sample has been autoclaved for preservation.
  • The sample must be stored at 4 °C.

Sample preparation

  • All constituents are present in soluble form.
  • Partially fill a 500 mL volumetric flask with reagent-grade water (near 20 ºC).
  • Open ampule PE1364-20ML (be careful to avoid cuts on glass) and transfer 10.0 mL of concentrate to the volumetric flask.
  • Fill the flask to volume with reagent-grade water and mix well.
  • The sample is now ready for immediate analysis.
  • Sealed ampules were autoclaved to preserve the solutions inside.
  • This preservation treatment is not effective after the ampule is opened. Therefore, the sample should be analyzed as soon as possible after sample preparation following the preservation and holding times as specified in the method.

Almacenamiento y estabilidad

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

Otras notas

Are you new to Supelco® Proficiency Testing? 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)

Drinking Water
WS22-2 March 23 - May 6, 2022
WS22-4 September 21 - November 4, 2022

WS23-2 March 22 – May 5, 2023
WS23-4 September 20 – November 3, 2023

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

Información legal

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



    Chloride 20-160 mg/L
    Fluoride 1-8 mg/L
    Nitrate as NO3 1-44.3 mg/L
    Nitrate as N 3-10 mg/L
    Nitrate+nitrite as N 3-10 mg/L
    Nitrite as NO2 1-6.59 mg/L
    Nitrite as N 0.400 - 2.00
    Orthophosphate as P 0.500 - 5.50
    Phosphate as PO4 1-100 mg/L
    Phosphorus, total 0.500 - 5.50
    Sulfate 25-250 mg/L
    See All (11)

Código de clase de almacenamiento

12 - Non Combustible Liquids



Punto de inflamabilidad F

Not applicable

Punto de inflamabilidad C

Not applicable

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).

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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