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. Publication date: 10 Sep 2019. ≤ 6 ° C, 3 NAOH PELLETS ***. 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. DOI: Hardback ISBN: 978-1-78801-735-0. 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. SAMPLE PRESERVATION AND HOLDING TIMES. FOR MERCURY: 28 DAYS. FOR WASTEWATER: NITRIC ACID (HNO3) -- CAN BE ADDED WHEN RETURNED TO LAB.
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. DRY WEIGHT METALS TESTING USUALLY DONE ON SLUDGE OR SOIL. Special Publications. 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. This information can be used to support holding times and/or sample preservation and storage conditions that are appropriate or necessary to meet project-specific data quality objectives.
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. FECAL COLIFORM ON SOLID. Tests, Bottles, Preservation and Holding Times. 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. WASTEWATER, BACTERIOLOGICAL. Download citation file: Greater than or equal to 7 days can be evaluated in the same units in which they are expressed. ≤ 6 ° C, 8 DROPS HCL(50%).
Recommended holding times in Chapters 3 and 4 of SW-846 are clearly identified as guidelines and not EPA requirements. 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. NOTE: ADD ENOUGH SODIUM THIOSULFATE TO CHLORINATED SAMPLES TO REMOVE RESIDUAL CHLORINE. Skip Nav Destination. Short Holding Times. US EPA to Revise its Guidance for Sample Holding Times. As you identified in your letter, the concentrations of many metals and organic chemicals have been observed to change more slowly in properly preserved materials and holding times on the order of days or months have been established for these tests. It is also important to point out that authorized states can be more stringent when designating holding times or interpreting guidance on measuring holding times. 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. PDF ISBN: 978-1-78801-773-2.
TOTAL SUSPENDED SOLIDS. DRINKING WATER, BACTERIOLOGICAL. 5 ML BRCL (WITHIN 48 HOURS). 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: -. Rock J. Vitale, CEAC. FOR OVER 10 METALS: 1-LITER PLASTIC. FOR DRINKING WATER: HOLD UP TO 7 DAYS WITHOUT NITRIC ACID (HNO3). Holding Times and Preservation for Environmental Radiochemical Samples: An Evaluation of ISO Standard Guidelines.
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