Standard test methods for sulfur in ash from coal and coke

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Annu. Book ASTM Stand.; (United States)

OSTI ID:6448990

These methods cover three optional gravimetric procedures for determining sulfur in coal or coke ash prepared according to Method D 2795 or D 3174. The sulfur content is reported as SO/sub 3/. Method A: modified British method, a sample of prepared coal ash is digested in boiling dilute hydrochloric acid solution to which bromine water is added to ensure that all sulfur is oxidized to the sulfate form. After neutralization and precipitation of iron with ammonium hydroxide, the mixture is filtered and sulfate in the filtrate is determined gravimetrically as barium sulfate. Method B: Eschka mixture, a sample of prepared coal or coke ash and Eschka mixture is ignited together in air. The sulfates are dissolved in hot water and separated from undissolved ash residue and magnesium oxide by filtration. Sulfate in the filtrate is determined gravimetrically as barium sulfate. Method C: sodium carbonate fusion method, a sample of prepared coal or coke ash is mixed with sodium carbonate and potassium nitrate and fused in a platinum crucible. The mixture is cooled, digested in hot water, and filtered. Sulfate in the filtrate is determined gravimetrically as barium sulfate.

• OSTI ID: 6448990
• 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

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ALKALINE EARTH METAL COMPOUNDS
ASHES
BARIUM COMPOUNDS
BARIUM SULFATES
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COKE
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
MATERIALS
NONMETALS
OXIDATION
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RESIDUES
SULFATES
SULFUR
SULFUR COMPOUNDS