Potentiometric analysis of fluoride content (as F- ion) in solutions by using fluoride ion-selective electrode is simple. reliable and cheap. Very small concentrations of fluoride-ions (to 10-6 mol/dm3) can be determined by fluoride selective electrode. with regulation of ion strength of a solution and control of concentration of hydroxide ions and interfering ions of metals. https://www.duospiritalis.com/limited-deal-Radio-Birdman-Rock-Roll-Soldiers-T-Shirt-super-grab/