Determination of fluoride in food by the use of alkali fusion and fluoride ion-selective electrode

A simple, rapid, and reliable method was developed for determination of fluoride in biological samples. Fluoride was determined by alkali fusion and fluoride ion-selective electrode. The influence of concentration and volume of sodium hydroxide as ashing aid, sample weight, lifetime of the electrode and storage time of the sample solutions on analytical results were studied. Fluoride contents of various marine biological samples and certified reference material were determined.