A sample collected in January is considered to have met a specified 6 month holding time if it is prepared or analyzed before the end of July. SAMPLE PRESERVATION AND HOLDING TIMES. 10 ° C, SODIUM THIOSULFATE. Holding Times and Preservation for Environmental Radiochemical Samples: An Evaluation of ISO Standard Guidelines. Chapter 4 suggests that the project team consider existing information and data regarding analyte stability or perform additional testing in order to determine how best to preserve sample integrity for the analytes of interest. The SW-846 Methods Team will revise guidance related to holding times to be consistent with the interpretation above, and this interpretation will also be incorporated into Chapters 3 and 4 at the next available opportunity.
This interpretation of recommended holding times is consistent with that described in the current versions of the Contract Laboratory Program's National Functional Guidelines for Organic and Inorganic Superfund Methods Data Review3 and with DoD's Quality Systems Manual v. 5. FOR ALL EXCEPT MERCURY: 6 MONTHS. However, some chemicals are identified in SW-846 as unstable or reactive over a short timeframe, and for projects where these chemicals are of particular interest, the best practice for obtaining representative measurements is to complete testing as soon as possible after samples are collected. DRY WEIGHT METALS TESTING USUALLY DONE ON SLUDGE OR SOIL. Table 3 lists the approved procedures, preservation and holding times for water for parameters not listed on Table 1. Short Holding Times. Skip Nav Destination. The letter stated: Thank you for your letter dated March 9, 2020, requesting clarification on how holding times in the SW-846 Compendium, from sample collection to preparation and analysis, are interpreted, particularly for holding times greater than or equal to 7 days. Greater than or equal to 7 days can be evaluated in the same units in which they are expressed. FOR WASTEWATER: NITRIC ACID (HNO3) -- CAN BE ADDED WHEN RETURNED TO LAB. Tests, Bottles, Preservation and Holding Times. Holding time studies referenced in SW-846 Chapter 41 do not provide a clear basis to discriminate between acceptable and unacceptable measurements within a small tolerance of the nominal holding time, such as within a few hours for holding times of 7 days.
WASTEWATER, BACTERIOLOGICAL. Additional variables can affect chemical stability that may not have been evaluated as part of a holding time study and may need to be considered during project planning. FECAL COLIFORM ON SOLID. Publication date: 10 Sep 2019. Recommended holding times in Chapters 3 and 4 of SW-846 are clearly identified as guidelines and not EPA requirements. Jasper Hattink, Roger Benzing, 2019. While we do not agree that the holding time guidelines or associated sample preservation recommendations published in SW-846 are technically deficient, we understand and agree that inconsistent interpretations of how holding times are evaluated across EPA programs can create inadvertent problems or lead to confusion for sample collectors, laboratories, and data users. We agree that the primary purpose of establishing maximum holding times from sample collection to preparation and analysis is to minimize changes to specific, measurable properties that were representative of the material at the time it was collected. Technical Director of Chemistry.
Given these factors and after examining the recommended holding times and associated studies referenced in SW-846 and interpretations of how holding times are evaluated across other EPA programs, the Office of Resource Conservation and Recovery (ORCR) has decided to clarify that the recommended holding times in SW-846 Chapter 32 (Table 3-2) and Chapter 4 (Table 4-1). Jasper Hattink; Doi: -. US EPA to Revise its Guidance for Sample Holding Times. Sample preservation, holding times, required sample volumes, and container types are listed in Table 1 for water samples and Table 2 for soil and sediment samples. Rock J. Vitale, CEAC. Published:10 Sep 2019. Environmental Radiochemical Analysis VI.
To view a PDF for the letter CLICK HERE. ≤ 6 ° C, 8 DROPS HCL(50%). TOTAL SUSPENDED SOLIDS. 5 ML BRCL (WITHIN 48 HOURS). SAMPLE MUST BE DRIED AT THE LAB IN AN OVEN.
On May 27, 2020, the American Council of Independent Laboratories (ACIL) was informed that it had been successful in convincing the US EPA to revise its guidance for sample holding times. ≤ 6 ° C, 2 NAOH PELLETS & 10 DROPS ZN ACETATE. TOTAL ORGANIC CARBON. For example, a sample collected on a Tuesday is considered to have met a specified 7-day holding time as long as it is prepared or analyzed by the end of the day on the following Tuesday. PDF ISBN: 978-1-78801-773-2. "Holding Times and Preservation for Environmental Radiochemical Samples: An Evaluation of ISO Standard Guidelines", Environmental Radiochemical Analysis VI, Nicholas Evans. NOTE: ADD ENOUGH SODIUM THIOSULFATE TO CHLORINATED SAMPLES TO REMOVE RESIDUAL CHLORINE.
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