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Enhanced soil sorption of methidathion using sewage sludge and surfactants
Author(s) -
Sánchez Lourdes,
Romero Esperanza,
SánchezRasero Francisco,
Dios Gonzalo,
Peña Aránzazu
Publication year - 2003
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.686
Subject(s) - methidathion , adsorption , chemistry , sewage sludge , pulmonary surfactant , sorption , amendment , environmental chemistry , freundlich equation , sewage , cation exchange capacity , chromatography , soil water , environmental engineering , organic chemistry , agronomy , environmental science , pesticide , biochemistry , soil science , chlorpyrifos , political science , law , biology
Batch experiments were carried out to examine the partitioning of an organophosphorus insecticide, methidathion, in non‐amended agricultural soil and soil amended with urban sewage sludge and/or different types of surfactant. Kinetic data showed that sewage sludge significantly reduced adsorption rate, whereas amendment of the soil with the cationic surfactant tetradecyltrimethylammonium bromide (TDTMA) at 10× CMC (critical micellar concentration) increased the adsorption rate by a factor of 10. The adsorption isotherms were evaluated using the Freundlich model. The soil adsorption capacity for methidathion was enhanced by amendment with sewage sludge and even more significantly with TDTMA at 10× CMC or combined with sewage sludge. TDTMA conferred a high hydrophobic character to the soil, enhancing the adsorption capacity of the rather hydrophobic methidathion. The amendment of soil both with sewage sludge and TDTMA combines the increased hydrophobicity with a higher surfactant retention by organic matter, due to an increase in cation exchange capacity, which promotes even more the adsorption capacity for the insecticide. An anionic surfactant, linear alkylbenzene sulfonate, and the non‐ionic Tween 80 only induced a slight modification in the kinetics and adsorption of methidathion. Copyright © 2003 Society of Chemical Industry