Determination of fluoride by atomic absorption spectrometry

Journal Article · Fri Mar 01 04:00:00 UTC 1968 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac60259a010· OSTI ID:5976421

Bond, A M; O'Donnell, T A

Fluoride ion depresses the absorption of magnesium in the air-coal gas flame, the change in absorbance of the magnesium resonance line at 2852 A being proportional to the fluoride concentration over the range 0.2-20 ..mu..g/ml (10/sup -5/-10/sup -3/M). In the absence of interfering ions, principally sulfate and phosphate, the effect can be used to determine fluoride ion in this concentration range. An alternative, though somewhat less sensitive, technique is based on the enhancement of zirconium absorption by fluoride ion in the nitrous oxide-acetylene flame; this allows the determination, with a high degree of freedom from interference, of fluoride ion over the range 5-200 ..mu..g/ml (2.5 x 10/sup -5/-10/sup -2/M). In the presence of phosphate, which interferes with the zirconium method, a similar enhancement of titanium absorption can be used for fluoride determinations in the range 40-400 ..mu..g/ml (2 x 10/sup -3/-2 x 10/sup -2/M). These atomic absorption methods for fluoride determinations have been found to be considerably more rapid than more classical methods and in many cases can be used directly without prior separation of fluoride. Their application has been demonstrated in the analysis of a wide range of inorganic fluorides. 14 references, 3 figures, 3 tables.

• Research Organization: Univ. of Melbourne, Parkville, Australia
• OSTI ID: 5976421
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 40:3; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
ABSORPTION SPECTROSCOPY
ALKALINE EARTH METALS
CHEMICAL ANALYSIS
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
INTERFERING ELEMENTS
MAGNESIUM
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SENSITIVITY
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS
TITANIUM
TRANSITION ELEMENTS
ZIRCONIUM