Standard method of test for oxides of nitrogen in gaseous combustion products (phenol-disulfonic acid procedure)

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

OSTI ID:7356877

Total oxides of nitrogen in gaseous effluents from combustion or other nitrogen oxidation processes are determined by the phenol-disulfonic acid colorimetric procedure. The gas sample is admitted into an evacuated flask containing an oxidizing absorbent consisting of hydrogen peroxide in dilute sulfuric acid. The oxides of nitrogen are converted to nitric acid by the absorbent solution, and the resulting nitrate ion is reacted with phenol disulfonic acid to produce a yellow compound. Compounds of nitrogen that are easily oxidized to nitrates, certain reducing agents, and halides in large concentrations all cause interference. For synthetic inorganic nitrate samples, the precision of the method is +-1 percent, while application of the method to exhaust gases from automotive engines gives a precision of +-5 percent. (BLM)

• OSTI ID: 7356877
• 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
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54 ENVIRONMENTAL SCIENCES
AIR
AIR POLLUTION
CHALCOGENIDES
CHEMICAL ANALYSIS
COMBUSTION PRODUCTS
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
MONITORING
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
SPECTROPHOTOMETRY
STANDARDS
WASTES