Determination of fluoride by conductometric titration

Conference · Sun Feb 01 04:00:00 EST 1959 · Anal. Chem.; (United States)

OSTI ID:5977170

Kubota, H; Surak, J G

The reaction between fluoride and lanthanum ions is utilized for a volumetric semimicrodetermination of fluoride in which the end point is located by changes in the conductivity of the reaction medium. Milligram quantities of fluoride in solution can be determined with good accuracy and precision, if the total amount of extraneous ions is small. The titration is best applied to the analysis of distillates of the Willard-Winter separation. Relative standard deviation of 0.15% has been obtained in titrating aliquots from a single distillation. A modified distillation apparatus which is simple to construct and permits rapid interchange of distilling flasks, makes possible separation of fluoride from a medium whose acid concentration is maintained high and nearly constant, to promote the efficiency of the distillation. A relative standard deviation of 1.8% for the distillation and titration was obtained from replicate determinations of 1-ml. aliquots of a standard fluoride solution containing about 5 mg. of fluoride. 11 references, 3 figures, 2 tables.

• Research Organization: Oak Ridge National Lab., TN
• OSTI ID: 5977170
• Conference Information: Journal Name: Anal. Chem.; (United States) Journal Volume: 31:2
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ACCURACY
CHARGED PARTICLES
CHEMICAL ANALYSIS
DISTILLATION
DISTILLATION EQUIPMENT
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EQUIPMENT
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONS
LANTHANUM IONS
MICROANALYSIS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
TITRATION
VOLUMETRIC ANALYSIS