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Organic Disinfection By-Products - WS

Proficiency Testing Material

WS - Organic Disinfection By-Products

Quality Level


ampule of 2 × 2 mL


in tert-butyl methyl ether




matrix material

storage temp.


General description

Organic Disinfection By-Products - 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. 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 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 Organic Disinfection By-Products - WS can be found in the reporting packet which will be available to download at PT Portal.


Organic Disinfection By-Products - WS proficiency testing material is suitable for testing the analytes in water supply/drinking water.

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 PT sample is packaged as a 1.5 mL concentrate.
  • The solvent for this sample is MTBE.
  • The PT sample is not preserved.

Sample Preparation

  • Fill a 100 mL Class A Volumetric Flask with 90 mL of organic-free reagent water.
  • Allow the ampule concentrate to equilibrate to room temperature.
  • Open the ampule and pipet exactly 20 μL of the concentrate into the flask.
  • Fill to volume and mix well.
  • This represents the sample for analysis.
  • Report results in μg/L.

Please Note: Total haloacetic acids refers to the sum of the 5 EPA regulated haloacetic acids in the sample: Dichloroacetic acid, Trichloroacetic acid, Monochloroacetic acid, Monobromoacetic acid, and Dibromoacetic acid.

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
WS22-4 September 21 - November 4, 2022

WS23-2 March22 – May 5, 2023
WS23-4 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



    Bromochloroacetic Acid 5-50 μg/L
    Dibromoacetic Acid 5-50 μg/L
    Dichloroacetic Acid 5-50 μg/L
    Monobromoacetic Acid 5-50 μg/L
    Monochloroacetic Acid 10-50 μg/L
    Total Haloacetic Acids 35-300 μg/L
    Trichloroacetic Acid 5-50 μg/L


FlameExclamation mark

Signal Word


Hazard Statements

Hazard Classifications

Flam. Liq. 2 - Skin Irrit. 2

Storage Class Code

3 - Flammable liquids



Flash Point(F)

-27.4 °F - closed cup - Solvent

Flash Point(C)

-33 °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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