Time-dependent leaching of coal fly ash by chelating agents

Journal Article · Tue Mar 01 04:00:00 EST 1983 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00109a004· OSTI ID:6026027

Harris, W R; Silberman, D

The rates of leaching of several transition-metal ions from coal fly ash by pH 7.4 solutions of the chelating agents citric acid, EDTA, Listidine and glycine have been measured as part of an investigation of the potential health effects of inhaled fly ash. The results are compared to leaching of the same fly ash by 0.5M HCl, 0.10 M pH 7.4 Tris buffer, 0.5 M NH/sub 4/OH, and canine serum. For the trace elements, Zn, Mn, G, Ni, and Cu, the initial leaching rates with 0.5 M HCl range from 350 to 850 ppm/d. The rates drop by 1-2 orders of magnitude within 24 h and then level off at 1-10 ppm/d. The initial rates with EDTA and citric acid are also high, 100-400 ppm/d, but they fall off even more rapidly than the HCl leaching rates. The leaching of vanadium is exceptionally rapid, with initial rates of 1000-3000 ppm/d.

• OSTI ID: 6026027
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 17:3; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
010800* -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
ASHES
CARBONACEOUS MATERIALS
CHELATING AGENTS
CHEMICAL REACTION KINETICS
COAL
COMPARATIVE EVALUATIONS
DISSOLUTION
ELEMENTS
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FUELS
HAZARDS
HEALTH HAZARDS
KINETICS
LEACHING
MATERIALS
METALS
REACTION KINETICS
RESIDUES
SEPARATION PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENTS
WASTES