Tentative test method for sulfur oxides in flue gases (barium chloranilate-controlled condensation method)

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Annu. Book ASTM Stand.; (United States)

OSTI ID:7212153

This method covers the high-precision determination of sulfur oxides emissions in flue gases. This method is applicable to the determination of SO/sub 2/ (26 to 7950 mg/m/sup 3/ or 10 to 3000 ppm) and SO/sub 3/ (33 to 990 mg/m/sup 3/ or 10 to 300 ppm). A 25-liter flue gas sample containing about 30 mg/m/sup 3/ or 10 ppM by volume of sulfur oxides will yield an absorbance at 530 nm of twice the blank value for a 1-cm cell. Higher concentrations of either SO/sub 2/ or SO/sub 3/ may be determined by suitable aliquoting provided that the sulfate concentration in the final solution is within the region where Beer's law applies (up to 350 ..mu..g sulfate/ml). Sulfur trioxide is condensed as sulfuric acid by controlled cooling of the flue gas. The resulting sulfuric acid aerosol is collected on a filter that is maintained above the water dew point. This eliminates the problem of oxidation of dissolved sulfur dioxide, and provides improved precision and accuracy in SO/sub 3/ collection. Sulfur dioxide is collected in midget impingers (in series with the SO/sub 3/ collector) and oxidized to sulfuric acid by aqueous 3% hydrogen peroxide absorbing solution. The sulfate concentration of each solution is determined separately by reaction with barium chloranilate in a pH-controlled, 50% alcohol solution to yield the highly colored acid chloranilate. The concentration of the product colored species is determined spectrophotometrically at 530 nm. From the measured concentration of the sulfur oxides and the volumetric flow which is determined by a pitot tube traverse, the emission may be calculated.

• OSTI ID: 7212153
• 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

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
FLUE GAS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
SENSITIVITY
SPECTROPHOTOMETRY
STANDARDS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR TRIOXIDE
WASTES