Compositing and subsampling of media related to waste management activities

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Description

The American Society for Testing and Materials (ASTM) has been working with the US Environmental Protection Agency (EPA) to develop methods for use in the Environmental RCRA/CERCLA program. Two standards being developed are guides to field compositing and laboratory subsampling. Correctly performed compositing and subsampling are critical in the chain of sampling and analytical events. They must be accomplished in compliance with project objectives and instructions to assure that the resulting data is representative. In a site characterization effort, the collection of composite samples may be used to estimate the mean concentration of a waste analyte in contaminated media. Other ... continued below

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8 p.

Creation Information

Gagner, S.D. & Crockett, A.B. May 1, 1996.

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  • Gagner, S.D. Lawrence Livermore National Lab., CA (United States)
  • Crockett, A.B. Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)

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Description

The American Society for Testing and Materials (ASTM) has been working with the US Environmental Protection Agency (EPA) to develop methods for use in the Environmental RCRA/CERCLA program. Two standards being developed are guides to field compositing and laboratory subsampling. Correctly performed compositing and subsampling are critical in the chain of sampling and analytical events. They must be accomplished in compliance with project objectives and instructions to assure that the resulting data is representative. In a site characterization effort, the collection of composite samples may be used to estimate the mean concentration of a waste analyte in contaminated media. Other reasons to composite include reducing costs, efficiently determining the absence or possible presence of a hot spot, and, when coupled with retesting schemes, locating hot spots. If composite samples are collected, it is necessary to ensure that a representative sample is obtained for analysis. This may mean that samples must be mixed and subsampled using procedures that could include pan mixing and quartering, a mixing square, kneading, sieving and mixing, and particle size reduction. Field subsampling procedures include use of a rectangular scoop, an alternate scoop technique, and the slab-cake methods. A significant source of analytical error exists in obtaining a representative subsample of a sample delivered to a laboratory. These subsampling methods are designed to reduce the three major sources of subsampling errors; fundamental errors, grouping and segregation errors, and materialization errors.

Physical Description

8 p.

Notes

OSTI as DE96011414

Source

  • 12. annual waste testing and quality assurance symposium, Washington, DC (United States), 22-24 Jul 1996

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  • Other: DE96011414
  • Report No.: UCRL-JC--124193
  • Report No.: CONF-9607123--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 244588
  • Archival Resource Key: ark:/67531/metadc668119

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Creation Date

  • May 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 23, 2016, 1:20 p.m.

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Gagner, S.D. & Crockett, A.B. Compositing and subsampling of media related to waste management activities, article, May 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc668119/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.