Adsorption-desorption studies of alachlor, metolachlor, EPTC, chlorothalonil and pirimiphos-methyl in contrasting soils (Journal article)

Patakioutas, G./ Albanis, T. A.


Five soils with different organic matter contents ranging from 0.48 to 10.4% were used to study the adsorption and desorption of alachlor, metolachor, EPTC, chlorothalonil. and pirimiphosmethyl in batch experiments. The isotherm shapes according to Giles classification were S-type for alachlor, metolachlor and chlorothalonil, changing to L-type for the latter as the level of soil organic matter increased, and L-type for EPTC and pirimiphos-methyl. The adsorption isotherms fitted the Freundlich equation x/m = KfCe1/n. The K-f values increased with the increase of organic matter content. The amounts of pesticides adsorbed over a range of concentrations of 0.1-20 mg litre(-1) reached 63.1% for alachlor, 69.2% for metolachlor, 89.3% for EPTC, 98.4% for chlorothalonil and 96.3% for pirimiphos-methyl. The increase of the amounts desorbed with acetone indicated that the sorption of organic compounds onto organic matter occurred principally via weak London-type induction forces, or dispersion forces which are characteristics of the physical adsorption process. (C) 2002 Society of Chemical Industry.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: alachlor,metolachlor,eptc,chlorothalonil,pirimiphos-methyl,adsorption-desorption,soils,pesticide-residues,gas-chromatography,environmental fate,organic-carbon,sorption,atrazine,deethylatrazine,coefficients,extraction,surface
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/8766
ISSN: 1526-498X
Link: <Go to ISI>://000174480600005
http://onlinelibrary.wiley.com/store/10.1002/ps.464/asset/464_ftp.pdf?v=1&t=h0drj2rb&s=093a96ba97716e50085659940e513c7d7feb9367
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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