Tentative method of analysis for fluoride content of the atmosphere and plant tissues (semiautomated method). [Calorimetrically; fluoride bleaching of lanthanum -alizarin blue]

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Annu. Book ASTM Stand.; (United States)

OSTI ID:7343402

A method is described for a semiautomatic procedure for the determination of fluoride in plant materials and in atmosphere samples wherever standards of identical composition have been carried through the same procedure. Plant materials are dried and ground, then ashed, alkali-fused, acidified, and diluted to standard volume. Atmospheric samples are brought into solution according to other standard methods, D1301, 1302, and 1303. The semiautomated apparatus is described in detail and consists of a polytetrafluoroethylene coil of a microdistillation sieve maintained at 170/sup 0/C through which a stream of air carries the acidified sample to a fractionation column. Fluoride and water vapor are condensed and pumped continuously from a distillate collector. The distillate is mixed continuously with the colorimetric reagent, lanthanum-alizarin blue and passed through a flow cell of a recording colorimeter where any fluoride bleaching of the color is measured at 624 nm. (BLM)

• OSTI ID: 7343402
• 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)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
AIR
CHEMICAL ANALYSIS
DISTILLATION
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
MONITORING
PLANT TISSUES
SEPARATION PROCESSES
SPECTROSCOPY
STANDARDS