This article explains the difficulties encountered in ion measurement when applying standard addition or direct measurement and how analysts can go about overcoming said difficulties.

Following every addition, the potential is recorded. After this, the ion concentration is calculated iteratively from the prospective difference and volume increment via the method of least squares.

The analyses of the alkaline samples were carried out with the standard addition method to compensate for a depressive interference of 26 ± 8 (± SD)%. The absorbance decrease of the ...