A potentiometric sensor for the determination of potassium in different baby follow-on milk, water, juice and pharmaceutical samples

Potassium is one of the minerals essential for the human body, and its intake is usually provided from foodstuffs. In this study, a novel potassium selective potentiometric sensor was developed to perform potassium analysis in baby follow-on milk, mineral water, drinking water, fruit juice and drug samples. The potassium selective sensor exhibited a low detection limit of 5.88 x 10-6 mol L-1 over a wide linear range from 1.0 x 10- 5 to 1.0 x 10-1 mol L-1. The sensor had a very short response time (< 5 s), good selectivity, good repeatability and high po-tential stability. In addition, the developed sensor was easy to manufacture with low cost, and it worked inde-pendently of pH changes in the pH range of 6.0-10.0. The developed sensor was applied to analysis of various food, drug and water samples and potassium ion determination was carried out with very high recoveries.