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Soil Sorption of Nickel: Influence of Solution Composition
Author(s) -
Bowman R. S.,
Essington M. E.,
O'Connor G. A.
Publication year - 1981
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1981.03615995004500050007x
Subject(s) - sorption , desorption , nickel , soil water , chemistry , environmental chemistry , inorganic chemistry , adsorption , geology , soil science , organic chemistry
Sorption/desorption isotherms were used to evaluate the effects of solution composition on the retention of nickel (Ni) by soils of varying physical and chemical properties. Soils examined included agricultural soils of New Mexico, as well as soils from potential chemical waste disposal sites. Sorption of Ni from 0.01 N CaCl 2 was extensive for all samples: more than 99% of added Ni was sorbed in some cases. Desorption in 0.01 N CaCl 2 was slight (extreme hysteresis). Ability to extract sorbed Ni with diethlyenetriaminetetraacetate (DPTA), however, indicated that Ni sorption was not completely lrreversible. Increasing the CaCl 2 concentration to 0.1 N lowered Ni sorption by up to 40%. This was due primarily to direct sorption competition by Ca, rather than to increased Ni‐Cl complex formation, as shown by parallel experiments using Ca(ClO 4 ) 2 . Presence of small amounts of ethylenediaminetetraacetate (EDTA) in the equilibrating solution lowered Ni sorption by up to 98%. The extent of the chelate effect depended upon whether EDTA was present in the Ni solution before or after contact with soil.