Cadmium, lead and zinc leaching from smelter fly ash in simple organic acids--simulators of rhizospheric soil solutions.
Emissions from base-metal smelters are responsible for high contamination of the surrounding soils. Fly ash from a secondary Pb smelter was submitted to a batch leaching procedure (0.5-168 h) in 500 microM solutions of acetic, citric, or oxalic acids to simulate the release of toxic metals (Cd, Pb, Zn) in rhizosphere-like environments. Organic acids increased dissolution of fly ash by a factor of 1.3. Cadmium and Pb formed mobile chloro- and sulphate-complexes, whereas Zn partly present in a citrate (Zn-citrate(-)) complex is expected to be less mobile due to sorption onto the positively charged surfaces of hydrous ferric oxides (HFO) and organic matter (OM) in acidic soil.
Ettler
Vojtech
V
Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 12843 Prague 2, Czech Republic. ettler@natur.cuni.cz
Vrtisková
Růzena
R
Mihaljevic
Martin
M
Sebek
Ondrej
O
Grygar
Tomás
T
Drahota
Petr
P
D000085:Acetates / Q000737:chemistry; D000143:Acids / Q000737:chemistry; D002104:Cadmium / Q000032:analysis; D002244:Carbon / Q000032:analysis*; D002951:Citrates / Q000737:chemistry; D060729:Coal Ash; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis; D008669:Metallurgy; D019216:Metals, Heavy / Q000032:analysis*; D010070:Oxalates / Q000737:chemistry; D052638:Particulate Matter / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D012996:Solutions; D013816:Thermodynamics; D014961:X-Ray Diffraction; D015032:Zinc / Q000032:analysis
D000085:Acetates; D000143:Acids; D002951:Citrates; D060729:Coal Ash; D019216:Metals, Heavy; D010070:Oxalates; D052638:Particulate Matter; D012987:Soil; D012996:Solutions; D002104:Cadmium; D007854:Lead; D002244:Carbon; D015032:Zinc