Surface adsorption and photo-reactivity of sulfonylurea herbicides (Journal article)

Albanis, T. A./ Bochicchio, D./ Bufo, S. A./ Cospito, I./ D'Auria, M./ Lekka, M./ Scrano, L.

Photodegradation of two sulfonylurea herbicides, triasulfuron and thifensulfuron-methyl adsorbed on Preveza or Nea Malgara soils (Greece) was studied in outdoor and laboratory experiments. Herbicides on adsorbed phase and kept in the dark were characterised by a high reactivity, giving depletion curves that can be all described by a first order equation. In the irradiation experiments the kinetic behaviour of photodegradation was complex and characterised by a double step photoreaction. After a first period varying from 8 to 24 h the rate of reaction was reduced to 7-31% of the initial rate. The kinetic constant related to the degradation of triasulfuron practically showed the same values of those obtained for thifensulfuron-methyl. The half-lives obtained on Nea Malgara soil were generally higher than those obtained using Preveza soil. The observed behaviour is explained considering the photochemical properties of the herbicides, and the organic matter content of the soils.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: triasulfuron,thifensulfuron-methyl,adsorbed phase,soil,photodegradation,kinetics,thifensulfuron-methyl,soil,degradation,hydrolysis,chlorsulfuron,triasulfuron
ISSN: 0306-7319
Link: <Go to ISI>://000179634000007
Publisher: Taylor & Francis
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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