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Rückstand - WP

Proficiency Testing Material

NPW - Residue




ampule of 2 × 1.5 g






matrix material

Allgemeine Beschreibung

Residue - 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 Residue - WP can be found in the reporting packet which will be available to download at PT Portal.


Residue - WP is a non-potable water (NPW) PT standard, suitable for testing total solids (TS), total dissolved solids (TDS) and non-filterable residue (TSS) in water pollution/wastewater.

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

Leistungsmerkmale und Vorteile

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

Angaben zur Herstellung


  • This PT sample is a solid concentrate.
  • The matrix for this sample is NaCl.

Sample Preparation

  • Partially fill a 1000 mL volumetric flask with reagent-grade water.
  • Open container PE1050-1.5G and transfer entire contents to a volumetric flask.
  • Transfer to the volumetric flask using a glass funnel.
  • Rinse the vial, cap and funnel with reagent-grade water and transfer to the volumetric flask.
  • Fill the volumetric flask to volume (1000 mL) and mix by inverting the flask 10 times.
  • Allow sample to rest for 10 min and invert 10 more times.
  • Immediately after the second set of inversions, rapidly measure a 500 mL aliquot into a graduated cylinder by repetitively mixing and pouring so as not to allow solids to settle in the flask before the transfer is complete.
  • The sample is now ready for immediate analysis.
  • Filter this 500 mL aliquot and determine the analytes according to the chosen method(s).
  • Remember to correct back to 1000 mL.

Lagerung und Haltbarkeit

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

Sonstige Hinweise

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)

WP22-2 March 23 - May 6, 2022
WP22-4 September 21 - November 4, 2022

WP23-2 March 22 – May 5, 2023
WP23-4 September 20 – November 3, 2023

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

Rechtliche Hinweise

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



    Total Solids (TS) 140-675 mg/L
    Total Dissolved Solids at 180 °C (TDS) 140-650 mg/L
    Non-Filterable Residue (TSS) 23-100 mg/L


Health hazard





STOT RE 2 Inhalation


12 - Non Combustible Liquids



Flammpunkt F

Not applicable

Flammpunkt 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.

Contact Technical Service