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An aliquot is the fraction or measured part of a sample or specimen that is removed and placed in a different container for testing.[1][2] For purposes of reporting, the amount of aliquot used in a given test is "the amount (weight or volume) of sample subjected to an analysis," or, "if the analytical method requires the prior use of an independent preparative method, [it] is the amount of sample subjected to the preparative method prior to actual analysis of the sample."[3]


  1. National Center for Radiological Health (1967). Radioassay Procedures for Environmental Samples. p. A-4. 
  2. Baratta, E.J. (1994). Manual of Food Quality Control: 16. Radionuclides in Food. Food and Agriculture Organization of the United Nations. pp. 123. ISBN 9789251035788. 
  3. U.S. Environmental Protection Agency (March 2019). "Appendix A. Data Element Dictionary (DED)" (PDF). SEDD Specification Version 5.2. Retrieved 21 September 2022.