Document Detail

Chemical speciation and phytoavailability of Zn, Cu, Ni and Cd in soil amended with fly ash-stabilized sewage sludge.
MedLine Citation:
PMID:  14592566     Owner:  NLM     Status:  MEDLINE    
A sequential extraction method was used to determine chemical forms of Cu, Zn, Ni and Cd in fly ash-stabilized sludge. A loamy acid soil amended with fly ash-stabilized sludge was used to grow corn under greenhouse conditions. Sewage sludge amended with coal fly ash can reduce the availability of Cu, Zn, Ni and Cd in the sludge. Increasing fly ash amendment rate significantly reduced DTPA-extractable Cu, Zn, Ni and Cd concentrations. Percentages of Cu, Zn and Ni in residual fraction increased with an increase in fly ash amendment rates. Majority of Cu was associated with organic form, but Zn and Ni were associated with Fe-Mn oxide and residual forms. Addition of ash-amended sludge to soil significantly increased dry mass of corn. With coal fly ash amendment rate increasing, concentrations of Zn and Cu in shoot tissues of corn decreased significantly, but concentrations of Cd and Ni did not change significantly. Significant correlations were found between concentrations of Cu and Zn in corn shoot and oxide and total Cu fractions, and all chemical fractions of Zn in fly ash-stabilized sludge, respectively. Hence, ash amendment significantly reduced the availability of heavy metals by chemical modification of their chemical speciation into less available forms.
D C Su; J W C Wong
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environment international     Volume:  29     ISSN:  0160-4120     ISO Abbreviation:  Environ Int     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-10-31     Completed Date:  2004-04-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7807270     Medline TA:  Environ Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  895-900     Citation Subset:  IM    
Department of Plant Nutrition, China Agricultural University, 100094 Beijing, PR China.
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MeSH Terms
Biodegradation, Environmental
Biological Availability
Carbon / chemistry*
Environmental Monitoring
Industrial Waste
Metals, Heavy / chemistry*,  pharmacokinetics*
Particulate Matter
Refuse Disposal / methods
Sewage / chemistry*
Zea mays / chemistry,  growth & development
Reg. No./Substance:
0/Coal; 0/Industrial Waste; 0/Metals, Heavy; 0/Particulate Matter; 0/Sewage; 68131-74-8/fly ash; 7440-44-0/Carbon

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