Complex Nutrients - Water Pollution (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 sample is manufactured 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.
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 Complex Nutrients - Water Pollution (WP) proficiency testing standard can be found in the reporting packet which will be available to download at PT Portal.
Complex Nutrients - Water Pollution (WP) is a non-potable water (NPW) PT standard, suitable for testing complex nutrients in water pollution/wastewater samples.
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 is as a 2 mL concentrate.
The solvent for this sample is water.
The PT sample has been autoclaved for preservation.
To prepare the solution, partially fill a 1000 mL volumetric flask with ammonia-free, reagent-grade water (near 20 ºC).
Open ampule PE1051-2ML (be careful to avoid cuts on glass) and transfer 1.0 mL of concentrate to the volumetric flask.
Fill the volumetric flask to volume with reagent-grade water and mix well.
The sample is now ready for immediate analysis.
If a solution is not to be analyzed within two days after preparation, preserve a sample aliquot with 0.2 mL of concentrated sulfuric acid per 100 mL of sample (pH<2) and store at 4 ºC until just before analysis.
Analyze the preserved sample as soon as possible within the maximum 28-day holding time.
Storage and Stability
Please refer to sample label for expiration date, specific storage temperature, and specific storage conditions.
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 email@example.com.
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 (2021-2022)
Wastewater WP21-1January 13 - February 26, 2021 WP21-2March 24 - May 7, 2021 WP21-3July 7 - August 20, 2021 WP21-4September 22 - November 5, 2021
WP22-1January 12 - February 25, 2022 WP22-2March 23 - May 6, 2022 WP22-3July 6 - August 19, 2022 WP22-4September 21 - November 4, 2022
DMR-QA (US customers only) DMR-QA 41 March 19 - July 5, 2021
DMR-QA 42 2022 Dates TBD
Supelco is a registered trademark of Merck KGaA, Darmstadt, Germany
Kjeldahl nitrogen, total (TKN) 1.5-35 mg/L
Organic nitrogen 1.5-35 mg/L
Nitrogen, total 1.5-35 mg/L
Phosphorus, total .5-10 mg/L
Storage Class Code
12 - Non Combustible Liquids
Certificate of Analysis
Certificate of Origin
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