Determination of fluoride in wine by fluoride selective ion electrode, standard addition method: collaborative study.
The accuracy, precision, and reproducibility of a rapid method for determination of fluoride in wine, using a fluoride selective ion electrode, were established by a collaborative study involving 12 laboratories, 5 in Europe and 7 in the United States. The laboratories assayed 6 Youden pairs of fluoride-fortified, red and white wine samples with fluoride concentrations ranging from 0.2 to 3.0 mg/L. The relative standard deviations of repeatability ranged from 1.94 to 4.88%; relative standard deviations of reproducibility ranged from 4.15 to 18.40%. HORRAT values ranged from 0.30 to 0.97. The average recovery was 99.97%. Based on the statistical results of this collaborative study, the Study Director recommends that this method be adopted First Action.
E&J Gallo Winery, Analytical and Chemical Sciences Department, PO Box 1130, Modesto, CA 95353, USA. bruno.trombella@ejgallo.com
Bruno E
BE
Trombella
Arthur
A
Caputi
Daniel
D
Musso
Anthony
A
Ribeiro
Timothy
T
Ryan
D000465:Algorithms; D002021:Buffers; D002138:Calibration; D004563:Electrochemistry; D004566:Electrodes; D005459:Fluorides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D012015:Reference Standards; D015203:Reproducibility of Results; D012996:Solutions; D014920:Wine / Q000032:analysis*
D002021:Buffers; D007202:Indicators and Reagents; D012996:Solutions; D005459:Fluorides