Direct determination of fluoride in miscellaneous fluoride materials with the orion fluoride electrode

Improved recovery of fluoride in plant material using a low temperature sealed chamber digestion technique in conjunction with a fluoride ion‐specific electrode

“…Four fusion methods (6,22,23,24), one acid digestion Method (8), one oxygen-flask combustion Method (6) and the newly developed sealed chamber digestion method were compared. Only a brief description of each method is presented in Table 1 -all methods were performed exactly as described in the literature with the exception of method 2.…”

“…Only a brief description of each method is presented in Table 1 -all methods were performed exactly as described in the literature with the exception of method 2. For this method the plant sample was mixed with fixative as recommended by Oliver and Clayton (24), but fixative was also used to cover the surface of the fusion mixture before ashing. Teflon (polytetrafluorethylene) is a potential source of F contamination but it has excellent chemical resistance to oxidizing acids and a working temperature of 260'C (25).…”

Journal of Research of the U. S. Geological Survey, 1977, volume 5, issue 5

“…Several methods are available for fluorine determination in geological samples (Edmond, 1969;Ficklin, 1970;Fuge, 1976;Ingram, 1970;Kesler and others, 1973;Oliver and Clayton, 1970;Peters and Ladd, 1971). The classical distillation-titration method (Willard and Winter, 1933) is quite reliable and accurate, but it is time consuming and not satisfactory for geochemical exploration involving large numbers of samples.…”

Nonferrous Metallurgy - I. Light Metals: Aluminium, Beryllium, Titanium, and Magnesium

“…A direct determination of fluoride in miscellaneous fluoride materials with the fluoride selective ion electrode has been discussed by Oliver and Clayton (217). Liquid samples were mixed with a total ionic strength buffer, and direct potentiometric readings were compared to a calibration curve.…”