Abstract
A comparative study was carried out in which four analytical methods were tested for the determination of ionizable and total fluorine contents in newborn calf serum: (1) direct measurement of ionizable fluorine in the serum using the fluoride ion-selective electrode; (2) pretreatment with low temperature oxygen plasma ashing followed by the fluoride ion-selective electrode method or by gas chromatography; (3) separation of fluorine by microdiffusion followed by its determination by gas chromatography; and (4) direct extraction with 4% TMCS n-hexane followed by gas chromatography. The fluoride electrode method without any pretreatment proved efficient in determining the ionizable fluorine. Both the microdiffusion method and the direct extraction method proved deficient for the determination of total fluorine in the serum. The best results were obtained from the low temperature oxygen plasma ashing method followed by gas chromatography. The values resulting from this procedure presumably indicated an actual total fluorine content in the sample.
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