E. coli in Water PT- Quantitative WP



Nivel de calidad



set of 2 ea




food and beverages

enviado en

wet ice

temp. de almacenamiento



Escherichia coli


Descripción general

E. coli in Water PT – Quantitative WP is produced in accordance with ISO/IEC 17043:2010. This sample is manufactured according to TNI requirements. However, please note, this sample may include non-TNI analytes as well. 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.

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 E. coli in Water PT- Quantitative WP proficiency testing standard for E. coli testing in water can be found in the reporting packet which will be available to download at PT Portal.


E. coli in Water PT – Quantitative WP proficiency testing material is designed for the quantitative determination of E. coli in wastewater samples.

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

Características y beneficios

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


Set contains 2 sterile screw cap vials each containing a Vitroid (a small disk containing the possible organisms) and 2 – 99mL bottles of phosphate buffer.
(Please note, buffer solution may not be provided with your sample. If this causes any concern, please contact PT Service ptservice@milliporesigma.com.)

Nota de preparación


  • This PT sample is designed for the quantitative analysis of total and/or fecal coliform and E. coli.
  • The PT sample is provided in duplicate as a stable dehydrated disc requiring hydration. The additional sample is provided for mishaps in the lab. TNI prohibits the practice of multiple tests on a PT sample unless it is normal laboratory practice and multiple analysis is conducted on normal day to day samples.
  • If you are following IDEXX methods for Quantitray follow the directions provided with the media (suggests using Type 1 DI water.)
  • When prepared according to instructions, the concentration range of the sample will be between 20-2400 CFU/100mL as per TNI Fields of Testing, January 4, 2010.
  • The dehydrated disc sample is stable for a time exceeding the study schedule.General Information

General Information

  • Due to the sensitivity of microorganisms and short holding times after hydration, please read entire instructions prior to preparation.
  • This sample is a single disc and the possible concentration range is quite broad, it may be necessary to analyze the sample in a dilution series using a general phosphate buffer solution.
  • This sample may be analyzed by any method appropriate for coliforms.

Sample Preparation

  • Prepare your lavatory standard buffer or saline solution, this is your hydration fluid (see note below).
  • Allow the capped sample vial to equilibrate to room temperature.
  • Open the sample vial and aseptically transfer the disc to 100 ml of the hydrating fluid. NOTE: The sample is the colored disc within the cryotube. It will either be on top of cotton with opaque desiccant beads below the cotton or free moving in a cryotube that contains a desiccant tablet within the cap. The opaque desiccant beads and desiccant tablet are to keep the container dry and are not biologicals.
  • Allow the disc to dissolve completely this may take up to 15 minutes. Mix by inverting gently several times, shaking may cause the cap to leak.
  • This represents the sample for analysis. Incubate at the temperature required by your method. Temperature requirements are rigorous, higher temperatures will kill the organisms and lower temperatures may suppress growth. Minimum incubation time is 24 hours (or 18 hours dependent on method and media.) Further incubation time may be necessary depending on the method and media. Further dilutions are recommended to achieve a proper count, but base all counts on the whole volume sample. If you have questions, please contact ptservice@milliporesigma.com.

Note: We are no longer supplying Phosphate buffer for Micro samples. Please proceed to use your laboratory′s standard buffer or saline solution. If your laboratory does not have buffer in-house, we recommend using P3813, Phosphate Powder which can be purchased at SigmaAldrich.com.

Almacenamiento y estabilidad

Please refer to the sample label for storage conditions.

Otras notas

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 ptservice@milliporesigma.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.

This PT sample is designed for the quantitative analysis of total and/or fecal coliform and E. coli. The PT sample is provided in duplicate as a stable dehydrated vitroid requiring hydration. The additional sample is provided for mishaps in the lab. Store the PT sample as directed. The dehydrated vitroid™ sample is stable for a time exceeding the study schedule