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Biophysical Journal 8: 912-919 (1968)
© 1968 the Biophysical Society

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Individual Activity of Calcium Ions in Pure Solutions of CaCl2 and in Mixtures

Adam Shatkay

ABSTRACT

Individual ion activities were calculated for Ca2+ in pure solutions of CaCl2 and in mixtures of CaCl2 with MgCl2 and with NaCl, using different conventions to obtain {gamma}Ca2+. The results were compared with potentiometric measurements, using calcium specific electrodes. It is found that significant differences should be obtained for emf's using the different conventions, when ionic strength is greater than 0.5. The experimental results obtained for ionic strengths up to 0.2 favor slightly the direct use of {gamma}±CaCl2, but are fairly consistent also with the use of the Guggenheim and the MacInnes conventions.




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Copyright © 1968 by the Biophysical Society.