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Adsorption and Desorption of Paraquat in Acid Tropical Soils
Author(s) -
Juo A. S. R.,
Oginni O. O.
Publication year - 1978
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/jeq1978.00472425000700010002x
Subject(s) - adsorption , paraquat , desorption , chemistry , soil water , langmuir , langmuir adsorption model , environmental chemistry , inorganic chemistry , geology , soil science , organic chemistry
Adsorption of paraquat (1:1′‐dimethyl 4:4′‐bipyridylium chloride) by six common soil types from southern Nigeria was studied. Adsorption data conformed with linear Langmuir isotherm. Adsorption maximum ( b ) calculated from the Langmuir equation ranged from 1,200 to 7,500 µ g/g of soil. The iron oxide‐rich soil derived from basalts adsorbed the highest amount, while the strongly acidic soils derived from sedimentary rocks adsorbed the least amount of paraquat. Desorption data indicated that a substantial portion (40 to 70%) of the adsorbed paraquat could not be recovered by 12 successive extractions with dilute CaCl 2 solution.