Tentative method for automated separation and collection of particulate and acidic gaseous fluoride in the atmosphere (double paper tape sampler method)
This method covers the automatic separation and collection on chemically treated paper tapes of particulate and gaseous forms of acidic fluorides in the atmosphere by means of a double paper tape sampler. The sampler may be programmed to collect and store individual air samples obtained over time periods from several minutes to 3 h. A 30.5-m (100-ft) tape will allow unattended operation for the automatic collection of up to 600 samples. Air is drawn through an air inlet tube (see Recommended Practice D 1357) and is first passed through an acid-treated prefilter paper tape to remove particulate which may contain fluoride and then through an alkali-treated paper tape to remove acidic fluoride gases. The exhaust air is filtered through soda lime-glass wool, and the cleaned air is used to pressurize the front compartment to prevent fluoride contamination of the paper tapes from the ambient air. Automatically at the end of the preset sampling period, the vacuum pump is turned off, the tapes are indexed, and after indexing the vacuum pump is turned on. Indexing results in a ''dead time'' of several seconds. The paper tapes are removed from the sampler after a selected period of operation and taken to an analytical work area where the individual sample spots are cut out, treated to dissolve the fluoride, and analyzed by potentiometric or photometric methods.
- OSTI ID:
- 7087617
- Journal Information:
- Annu. Book ASTM Stand.; (United States), Vol. 26; Other Information: ASTM-D--3266-73
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tentative method for continuous separation and collection of particulate and water-soluble gaseous fluorides in the atmosphere (filter and impringer method)
Tentative method for continuous separation and collection of particulate and water-soluble gaseous fluorides in the atmosphere (filter and impinger method)
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AEROSOLS
POTENTIOMETRY
SAMPLING
AIR
CHEMICAL ANALYSIS
FLUORIDES
AIR POLLUTION
AUTOMATION
MONITORING
PARTICLES
SEPARATION PROCESSES
STANDARDS
COLLOIDS
DISPERSIONS
FLUIDS
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
POLLUTION
SOLS
TITRATION
400104* - Spectral Procedures- (-1987)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400102 - Chemical & Spectral Procedures