1991 Edition, July 15, 1991
Standard Test Method for Separation and Collection of Particulate and Gaseous Fluorides in the Atmosphere (Sodium Bicarbonate-Coated Glass Tube and Particulate Filter Method)
Includes all amendments and changes through Reapproval Notice , 2011
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Description / Abstract:
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 test method is applicable to 12-h sampling
periods, collecting 1 to 500 μg of gaseous fluoride at a 15 L/min
(0.5 ft3/min) sampling rate or about 0.1 to 50
μg/m3. The length of the sampling period can therefore
be adjusted so that the amount of fluoride collected will fall
within this range. The actual lower limit of the test 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."