Standard method of analysis for fluoride content of the atmosphere and plant tissues (semiautomated method)

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Annu. Book ASTM Stand.; (United States)

OSTI ID:6582649

This method covers the semiautomated procedure for the analyses of various types of samples for the purpose of determining total fluoride. Since the method incorporates microdistillation of the sample, it may be applied to any fluoride-containing solution where standards of identical composition have been carried through the same sample preparation procedures and have proven to provide quantitative recovery when analyzed by the semiautomated system. Conversely, the method should not be applied for analyses until the applicability has been demonstrated. The absorbance of an alizarin fluorine blue-lanthanum reagent, at 624 nm, is changed by very small amounts of inorganic fluoride, and is also sensitive to a number of other anions and cations commonly found in plant tissues. Metal cations and inorganic phosphate are not distilled in this system, and organic substances are destroyed by preliminary ashing. Chloride, nitrate, and sulfate may interfere if present in a sufficiently high concentration because they are distilled as acids. Their hydrogen ions bleach the reagent which, in addition to being an excellent complexing agent, is also an acid-base indicator. To reduce acidic interferences, a relatively high concentration of acetate buffer is used in the reagent solution despite some reduction in sensitivity.

• OSTI ID: 6582649
• Journal Information: Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 26; ISSN ASTSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
510200 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
BUFFERS
CHEMICAL ANALYSIS
COLLOIDS
DISPERSIONS
DISTILLATION
ELEMENTS
FLUORINE
HALOGENS
INTERFERING ELEMENTS
NONMETALS
PHOTOMETRY
PLANT TISSUES
QUANTITATIVE CHEMICAL ANALYSIS
SAMPLE PREPARATION
SEPARATION PROCESSES
SOLS