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primary pH standards

Certain substances which meet the criteria of:
  1. reproducible preparation in a highly pure state;
  2. stability of solution over a reasonable period of time;
  3. having a low value of the residual liquid junction potential;
  4. having pH betwen 3 and 11.
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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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