Tentative method for separation and collection of particulate and gaseous fluorides in the atmosphere (sodium bicarbonate-coated glass tube and a particulate filter method)
The sodium bicarbonate-coated glass tube and membrane filter method provides a means for the separation and collection of gaseous atmospheric forms of fluoride reactive with sodium bicarbonate and particulate forms of fluoride which are collected by a filter. The method is applicable to 12-h sampling periods, collecting 2 to 500 ..mu..g of gaseous fluoride at a 14.2 liters/min (0.5 ft/sup 3//min) sampling rate or about 0.2 to 50 ..mu..g/m/sup 3/. The actual lower limit of the method will depend upon the sensitivity of the analytical method employed and the quality of reagents used in tube preparation and analysis. It is recommended that the lower limit of detection should be considered as two times the standard deviation of the monthly arithmetic mean blank value. Any values greater than the blank by less than this amount should be reported as ''blank value.'' Gaseous fluorides are removed from the air stream by reaction with sodium bicarbonate coated on the inside wall of a borosilicate glass tube. Particulate fluorides are collected on a filter following the tube. The fluoride collected by the tube is eluted with water or buffer and analyzed for fluoride. The particulates collected by the filter are eluted with acid and analyzed for fluoride. The results are reported as micrograms of gaseous fluoride and micrograms of particulate fluoride per cubic meter of air at 21/sup 0/C (70/sup 0/F) and 760 torr (29.92 in. Hg).
- OSTI ID:
- 7295202
- 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
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Separtion and collection of particulate and gaseous fluorides in the atmosphere (sodium bicarbonate-coated glass tube and a particulate filter method)
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Related Subjects
400102 -- Chemical & Spectral Procedures
400104* -- Spectral Procedures-- (-1987)
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Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID CARBONATES
AEROSOLS
AIR
AIR FILTERS
AIR POLLUTION
ALKALI METAL COMPOUNDS
CHEMICAL ANALYSIS
COLLOIDS
DISPERSIONS
FILTERS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
MONITORING
PARTICLES
PHOTOMETRY
POLLUTION
POLLUTION CONTROL EQUIPMENT
POTENTIOMETRY
SAMPLING
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLS
STANDARDS
TITRATION