000			01960 am a22002053u 4500
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100	1	0	_aBates, Roger G. _eauthor
245	0	0	_aRevised Standard Values for pH Measurements from 0 to 95 °C
260			_b[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology, _c1962.
500			_a/pmc/articles/PMC5315334/
520			_aSeven standard solutions serve to fix the NBS conventional activity scale of pH (termed pH(s)) from 0 to 95° C. The original emf data have been re-examined and the values of the acidity function p(α(H)γ(Cl)), from which pH(s) is derived, have been recalculated with the use of a single consistent set of standard potentials and electrochemical constants. The convention proposed recently by Bates and Guggenheim for the numerical evaluation of the individual activity coefficient of chloride ion in the buffer solutions has been adopted, and by this means pH(s) values to the third decimal have been assigned. These "experimentar" pH(s) values in the temperature range 0 to 95 °C have been smoothed as a function of temperature by least-squares treatment. The properties and uses of the standards are discussed and directions for the preparation of the solutions are given.
540			_a
540			_ahttps://creativecommons.org/publicdomain/zero/1.0/
540			_aThe Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
546			_aen
690			_aArticle
655	7		_aText _2local
786	0		_nJ Res Natl Bur Stand A Phys Chem
856	4	1	_uhttp://dx.doi.org/10.6028/jres.066A.016 _zConnect to this object online.
999			_c589 _d589