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Adsorption isotherms for atrazine on soils measured by differential pulse polarography
Author(s) -
Vaz Carlos M. P.,
Crestana Silvio,
Machado Sergio A. Spinola,
Mazo Luis Henrique,
Avaca Luis Alberto
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140091219
Subject(s) - polarography , freundlich equation , adsorption , soil water , silt , atrazine , chemistry , analytical chemistry (journal) , organic matter , environmental chemistry , soil science , environmental science , inorganic chemistry , pesticide , geology , organic chemistry , paleontology , agronomy , biology
Differential pulse polarography was used to study the adsorption of atrazine on three tropical soils with different compositions regarding organic matter, clay, silt and sand. The corresponding Freundlich isotherms were determined and the calculated adsorption coefficients, K F , were 4.4, 9.9 and 5.2 mL g −1 for Pindorama, Monte Alegre and Ribeirão Preto soils, respectively. These values are in good agreement with previous reports. A comparison between the results obtained by differential pulse polarography and by gas chromatography was also performed showing that both techniques yield very similar isotherms.