Measurement of gaseous fluoride concentration using an internal

Details Measurement of gaseous fluoride concentration using an internal Measurement of gaseous fluoride concentration using an internal

1982-09-15

1984-01-31

Douglas, Winston A.

Chemistry: electrical and wave energy

Processes and products

436124, 436125, 436150, 422 98, 422 68, G01N 2746

Patent

active

044288000

ABSTRACT:
A method for measuring fluoride concentrations in a gas wherein a sample of the gas is mixed with an internal reference solution in a gas scrubber to form a fluoride-containing solution. The fluoride-containing solution is collected, and the concentration of fluoride ion is determined in a potentiometric apparatus. The apparatus includes a first electrode having a fluoride-sensitive element and a second electrode having an element sensitive to a halide ion other than fluoride ion. The improved method of the invention compensates for errors caused by evaporation of water from the gas scrubber.

REFERENCES:
patent: 3431182 (1969-03-01), Frant
patent: 3563874 (1971-02-01), Ross et al.
patent: 3960523 (1976-06-01), Ryan
Converse; J. G. et al., "Ion-Selective Electrode Analyzer for Monitoring Gaseous Hydrogen Chloride", ISA Transactions, vol. 15, No. 3, 1976, pp. 220-226.
Prior Art Public Use by Aluminum Company of America is discussed on p. 2 of patent specification.

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