Daphnia pulex, 48-hr Acute, nonrenewal, 25℃, MHSF

NA.24

This Whole Effluent Toxicity (WET) proficiency testing sample 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.

In acute WET tests, the small planktonic crustacean, Daphnia pulex, an inhabitant of freshwaters, is employed as a test organism and exposed to various effluent concentrations under controlled conditions for a short duration (48 h). This helps to estimate the effluent′s toxicity and arrive at the lethally toxic concentrations of the effluent.

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 PT 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.

Analyte/s: Values of analytes vary lot to lot.

All information regarding the use of Daphnia pulex, 48-hr Acute, nonrenewal, 25℃, MHSF proficiency testing standard can be found in the reporting packet which will be available to download at PT Portal.

Daphnia pulex, 48-hr Acute, nonrenewal, 25℃, MHSF proficiency testing material is designed for use in Acute Whole Effluent Toxicity (WET) proficiency testing.

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For more information on this product, please contact our PT Service Team.

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

Description

• The effluent is provided as a concentrate for dilution in moderately hard synthetic freshwater (MHSF).
• This concentrate is an EPA-specified toxicant in reagent-grade DI water.
• Enough material has been provided to run the method at least twice. If you require more toxicant, please contact ptservice@milliporesigma.com.
• Do not deviate from the supplied instructions or EPA Method 2021.0. Contact ptservice@milliporesigma.com before running the test if you see the need to deviate from the test conditions.
• Deviations may affect your final evaluation.

Preparation Instructions

• To prepare 1 L of effluent, add 900 mL of MHSF to a volumetric flask.
• Preparation instructions for MHSF can be found in the EPA document EPA-821-R-02-012, page 32.
• Transfer the entire contents of one ampule to the flask. Rinse the ampule with MHSF and transfer to the volumetric flask. Bring flask to 1 L volume with MHSF.
• This represents 1 L of effluent water for the test.
• The effluent prepared according to these instructions represents the sample ready for testing, 100% effluent.
• This 100% effluent is split into two 0.5 L aliquots. The first aliquot is your 100% effluent for testing. The second aliquot is diluted with 0.5 L MHSF and mixed. This becomes your 50% effluent sample. Continue diluting half of each sample with the same volume of MHSF to make your 25%, 12.5% and 6.25% effluent dilutions, which represent the five test dilutions.

Required Test Conditions

• Test Type: Static non-renewal.
• Test duration: 48 hours
• Temperature: 25 ºC ±1 ºC. The test must not deviate by more than 3 ºC during the test.
• Renewal of Test solutions: non-renewal
• Dilution water: Moderately hard synthetic water.

Test Conditions

• Light quality: Ambient laboratory illumination (recommended)
• Light intensity: 10-20 μE/m²/s (50-100 ft-c) (ambient laboratory levels) (recommended)
• Photoperiod: 16 h light, 8 h darkness (recommended)
• Test chamber size: 30 mL (recommended minimum)
• Test solution volume: 25 mL (recommended minimum)
• Age of test organisms: Less than 24-h old (required)
• No. organisms per test chamber: 5 for effluent and receiving water tests (required minimum)
• No. replicate chambers per concentration: 4 for effluent and receiving water tests (required minimum)
• No. organisms per concentration: 20 for effluent and receiving water tests (required minimum)
• Feeding regime: Feed YCT and Selenastrum while holding prior to the test; newly released young should have food available a minimum of 2 h prior to use in a test
• Test chamber cleaning: Cleaning not required Test chamber aeration: None (recommended)
• Dilution water: Moderately hard synthetic water prepared using MILLIPORE MILLI-Q or equivalent deionized water and reagent-grade chemicals or 20% DMW (see Section 7, Dilution Water), receiving water, groundwater, or synthetic water, modified to reflect receiving water hardness (available options)
• Test concentrations: Effluents: 5 and a control (required minimum) Dilution series: Effluents: >0.5 dilution series (recommended) Endpoint: Effluents: Mortality (required)

Test acceptability criterion: 90% or greater survival in controls (required)

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 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.

Whole Effluent Toxicity (WET) tests are designed to predict the impact and toxicity of effluents discharges.

Proficiency Testing Schedule (2021-2022)

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

100

ampule of 2 × 2 mL

in water

environmental

matrix material

12 - Non Combustible Liquids

WGK 1