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Dioxin in Water - WS

Proficiency Testing Material

EC Number:

Quality Level


ampule of 2 × 2 mL


in toluene




matrix material

storage temp.


General description

Dioxins in Water - WS (Water Supply) 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. 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.
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 from lot to lot. 

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


Supelco® Analytical Prep system design offers:

  • reduced solvent usage
  • decrease in sample preparation time (by two days relative to conventional methods)
  • extraction recoveries greater than 85%

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

Preparation Note


This concentrate contains 2,3,7,8-TCDD in toluene.

Sample preparation

  • Pour 1000 mL of reagent grade DI water into an extraction vessel.
  • Open ampule and transfer 1 mL of concentrate to the extraction vessel using Class - A glassware.
  • Analyze as required by your normal procedures.
  • For calculation purposes assume 1 L sample volume.

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)

Drinking Water

WS22-2 March 23 - May 6, 2022

WS23-2 March 22 – May 5, 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



    2,3,7,8-TCDD 20 - 100 pg/L

Signal Word


Hazard Classifications

Aquatic Chronic 1 - Asp. Tox. 1 - Flam. Liq. 2 - Repr. 2 - Skin Irrit. 2 - STOT RE 2 - STOT SE 3

Target Organs

Central nervous system

Storage Class Code

3 - Flammable liquids



Flash Point(F)

39.2 °F - closed cup - Solvent

Flash Point(C)

4 °C - closed cup - Solvent

Regulatory Information


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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