Abstract
Abstract In the determination of fluoride ion with an ion-selective electrode the permissible concentration of aluminum increases markedly with decreasing the fluoride concentration in 0.5M citrate buffer solutions at pi I 6. As the accuracy is constant over a concentration range down to 10−5 M F− where a Nernstian relation holds fluoride determinations can be accomplished by the successive dilution method. The dilution steps are repeated until the last two results are in agreement, while the concentration of citrate is kept constant. As the ionic strength is kept constant with citrate, the addition of sodium chloride to the buffer is not necessary. Several samples, especially glasses, have been analyzed successfully.
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