Separation and determination of fluoride in plant samples

Abstract

A simple and rapid separation method is described for the determination of fluoride in plant samples. Fluoride is separated by distillation in the presence of H 2 SO 4 and H 2 O 2 in a dry air steam. The variables that influence the distillation quantitation were optimized. The fluorides separated were subsequently determined by a spectrophotometric method of the La(III)-F − -alizarin complexone system. The precision of the procedure was significant, and the RSD was 3.7%. The accuracy of the method was statistically satisfactory, and the recovery was from 95.9 to 104.4%.

Differences of Fluorine in Cements Determined by Photometric Methods after Distillation and Pyrolysis

“…The most common technique for the sensitive determination of fluoride in real samples having complex matrices is spectrophotometry with batchwise or flow injection procedures, based on ternary fluoride complex formations with La(II) and alizarin (La-ALC), 1,2 after the separation by distillation [3][4][5][6][7] or pyrolysis; 8,9 the direct application of photometry is difficult due to complex-formation of fluoride with Fe(III) and Al(III) and precipitate-formation with alkalineearth metal and rare-earth metal ions.…”

Fluoride absorption, transportation and tolerance mechanism in Camellia sinensis, and its bioavailability and health risk assessment: a systematic review

“…A simple, convenient, inexpensive, and reliable quantification of fluoride in tea products/infusions would be to monitor levels in real‐time and accurately estimate daily intake through tea consumption. Numerous analytical methods are available for fluoride level determination in various tea products/infusions, including fluoride ion‐selective electrode potentiometry (F‐ISE), 85–88 spectrophotometry, 89,90 electrochemistry, 91 ion chromatography, 92,93 and fluorescence 94 . Apparently, these analytical methods have unique characteristics that are summarized in Fig.…”

The Amphoteric Ion Exchange Membrane Based on CS/CMC for Tobacco-Protein Adsorption and Separation from Tobacco Extract

“…On the other hand, with deepening research of tobacco protein, it is gradually recognized that tobacco protein, which is an abundant resource, is of high nutritional and commercial values in the food industry [7,8]. Many researchers attempted to extract and separate tobacco protein from tobacco using aqueous two-phase extraction [9], molecular distillation [10], and supercritical fluid chromatography [11]. However, the outcome remained limited because of the high cost and small production capacity.…”