Capco Analytical Services, Inc.
1536 Eastman Ave. Suite B
Ventura, CA 93003
Phone: (805) 644-1095; Fax: (805) 644-9947
JH Biotech
250 Washington Street
Bakersfield, CA 93307
Phone:(661) 638-0210
State of California Air Resources Board Method 421
Determination of Gaseous Chloride and Fluoride in Emissions from Stationary Sources
This method is applicable to the quantitative determination of gaseous chloride and fluoride in emissions from stationary sources. It detects gaseous chloride and fluoride compounds which can be absorbed and ionized in a mildly basic buffer solution, and also detects volatile chloride and fluoride compounds in aerosol mists. Hydrochloric acid (HCl) and
hydrofluoric acid (HF) are assumed to be the principle compounds detected when testing combustion processes.
Principle:
Gas with entrained aerosols is extracted isokinetically from the stack with a heated glass or quartz probe and passed through a heated filter to a series of chilled impingers where gaseous chlorides and fluorides are absorbed in a solution of sodium bicarbonate and sodium carbonate. This impinger solution is analyzed for chloride and fluoride by ion chromatography with conductivity detection. The chloride and fluoride peaks are identified by characteristic retention times and quantified by
reference to external standards.
Determination of Gaseous Chloride and Fluoride in Emissions from Stationary Sources
This method is applicable to the quantitative determination of gaseous chloride and fluoride in emissions from stationary sources. It detects gaseous chloride and fluoride compounds which can be absorbed and ionized in a mildly basic buffer solution, and also detects volatile chloride and fluoride compounds in aerosol mists. Hydrochloric acid (HCl) and
hydrofluoric acid (HF) are assumed to be the principle compounds detected when testing combustion processes.
Principle:
Gas with entrained aerosols is extracted isokinetically from the stack with a heated glass or quartz probe and passed through a heated filter to a series of chilled impingers where gaseous chlorides and fluorides are absorbed in a solution of sodium bicarbonate and sodium carbonate. This impinger solution is analyzed for chloride and fluoride by ion chromatography with conductivity detection. The chloride and fluoride peaks are identified by characteristic retention times and quantified by
reference to external standards.