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Extractability of Copper, Zinc, Cadmium, and Lead in Soils Incubated with Sewage Sludge
Author(s) -
Silviera D. J.,
Sommers L. E.
Publication year - 1977
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1977.00472425000600010012x
Subject(s) - sewage sludge , chemistry , cadmium , zinc , soil water , fractionation , copper , environmental chemistry , metal , fraction (chemistry) , sewage , environmental engineering , chromatography , environmental science , soil science , organic chemistry
Soils amended with sewage sludge were incubated in the laboratory and analyzed periodically by a sequential fractionation procedure for the amounts of Cu, Zn, Cd, and Pb that were H 2 O‐soluble, KNO 3 ‐exchangeable, and DTPA‐ and HNO 3 ‐extractable. The H 2 O‐soluble and exchangeable metals comprised a small percentage of the total metal concentration in the sludge and in the soil‐sludge mixtures incubated for 7 to 28 days. The proportion of total Cu, Zn, and Cd extracted by DTPA increased with time while this fraction remained constant with time for Pb. The relative amount of metals extracted by HNO 3 and DTPA were inversely related. The data indicated that the forms of some metals in soils amended with sludge change with time, suggesting changes in the availability of metals to plants.