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Alcohols in Water - WS

Proficiency Testing Material


Quality Level


ampule of 2 × 1.2 mL


in water




matrix material

storage temp.


General description

Alcohols in Water – WS (Water Supply) proficiency testing material is produced in accordance with ISO/IEC 17043:2010. This product is also referred to as Potable water or Water Supply sample. Our 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

Values of analytes vary lot to lot.

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


Alcohols in Water - Water Supply (WS) is majorly featured in environmental analysis. For quality testing of safe drinking water, our PT samples provide low-concentrate analytes to represent the levels observed in 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 1.2 mL concentrate.
  • The solvent for this sample is water.
  • The PT sample is not preserved.
  • The sample must be stored at 4 ºC.
  • The pack-size on this sample has recently changed from 2 mL to 1.2 mL. This change does not affect the performance of the proficiency test.

Sample Preparation
  • To prepare the solution, fill a 100 mL volumetric flask to volume with carbon-filtered reagent-grade water at room temperature.
  • Open ampule PE1312-1.2ML (be careful to avoid cuts on glass) and immediately withdraw 20 μL.
  • Quickly inject the 20 μL aliquot into the reagent water in the expanded area of the volumetric flask.
  • Mix the sample by inverting the flask three times only (excessive shaking results in loss of volatiles) and analyze immediately.

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 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 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)

Legal Information

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



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    1-Propanol 2.5-20 mg/L
    2-Butanol 5-50 mg/L
    4-Methyl-2-Pentanone (MIBK) 1-50 mg/L
    Ethanol 5-50 mg/L
    Iso-Butanol 5-50 mg/L
    Isopropyl Alcohol (2-Propanol) 2.5-50 mg/L
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    n-Butyl Alcohol 5-50 mg/L
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Storage Class Code

12 - Non Combustible Liquids



Flash Point(F)

Not applicable

Flash Point(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