A probabilistic strategy for compositing samples for waste analysis

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Description

A probabilistic strategy for sample compositing was developed to minimize the volume of waste sample analyses. Disposable waste must have a contaminant concentration below an acceptance Limit L. A composite of N different samples must have a contaminant concentration below L/N, to assure that no individual sample is unacceptable. Unacceptable samples are eventually identified by analyses of successive splits composited with N/2, N/4,... of the original samples. The probable number of such analyses is derived using conservative log-Normal distributions to model the concentration probabilities. A minimum number of analyses result when N = L/a, where a is the average contaminant ... continued below

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15 p.

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Winn, W.G. December 31, 1989.

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Description

A probabilistic strategy for sample compositing was developed to minimize the volume of waste sample analyses. Disposable waste must have a contaminant concentration below an acceptance Limit L. A composite of N different samples must have a contaminant concentration below L/N, to assure that no individual sample is unacceptable. Unacceptable samples are eventually identified by analyses of successive splits composited with N/2, N/4,... of the original samples. The probable number of such analyses is derived using conservative log-Normal distributions to model the concentration probabilities. A minimum number of analyses result when N = L/a, where a is the average contaminant concentration expected for the sample. The approximation is useful for L/a {ge} 5. Experimental composites from 880 samples with L/a = 41.8 are consistent with the calculated predictions.

Physical Description

15 p.

Notes

OSTI as DE98007418

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  • Other Information: PBD: [1989]

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  • Other: DE98007418
  • Report No.: DP-MS--89-62
  • Grant Number: AC09-89SR18035;AC09-76SR00001
  • DOI: 10.2172/665988 | External Link
  • Office of Scientific & Technical Information Report Number: 665988
  • Archival Resource Key: ark:/67531/metadc706287

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 31, 1989

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Dec. 3, 2015, 6:12 p.m.

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Winn, W.G. A probabilistic strategy for compositing samples for waste analysis, report, December 31, 1989; United States. (digital.library.unt.edu/ark:/67531/metadc706287/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.