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preconcentration coefficient

in trace analysis
This is defined as
K = Q T Q M Q T o Q M o
where Q T and Q T o are the quantities of the microcomponent in the concentrate and in the sample, respectively (mass units or concentration units), and Q M o and Q M and are the quantities of the matrix before and after preconcentration, respectively. If the recovery is 100%, K = Q M o Q M. The terms enrichment coefficient and enrichment factor are not recommended.
PAC, 1979, 51, 1195 (Separation and preconcentration of trace substances. I - Preconcentration for inorganic trace analysis) on page 1198
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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