The H + ion-selective electrode on the Phoenix Mars Lander has selectivity coefficients K pot HNA+ =
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The H+ ion-selective electrode on the Phoenix Mars Lander has selectivity coefficients KpotHNA+ = 10-8.6 and KpotH+,Ca2+ = 10-7.8. Let A be the primary ion sensed by the electrode and let its charge be zA. Let X be an interfering ion with charge zX. The relative error in primary ion activity due to an interfering ion is
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This expression applies for errors less than ~10%. If the pH is 8.0 (AH+ = 10-8.0) and ANa+ = 10-2.0, what is the relative error in measuring ? If the pH is 8.0 and ACa2+ =10-2.0, what is the relative error in measuring AH+?
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