PMID: 11312857Apr 21, 2001Paper

Role of ferrihydrite in adsorption of three imidazolinone herbicides

Journal of Agricultural and Food Chemistry
P LeoneV Boero

Abstract

Adsorption of the imidazolinone herbicides imazapyr, imazethapyr, and imazaquin on synthetic ferrihydrites, either freeze-dried or not-freeze-dried, has been studied. The synthetic ferrihydrites were characterized by X-ray diffraction, scanning electron micrographs, and specific area determination. On each ferrihydrite, adsorption was found to be strongly dependent on pH. The highest extent of adsorption took place at pH values close to the pK(a) of the carboxylic group of the herbicides. No adsorption was observed at pH > 8. The freeze-drying process reduced the adsorptive capacity of the ferrihydrite by formation of larger aggregates provoking a decrease of the surface area. The chemical differences between the herbicides did not strongly affect the adsorption process of the herbicides. However, imazaquin was more adsorbed than the other two herbicides, in particular at pH close to its pK(a).

Citations

Feb 6, 2004·Chemosphere·Jerome B WeberCarl F Reinhardt
Oct 11, 2013·Environmental Toxicology and Chemistry·Valeria Rosana GianelliJosé Luis Costa
Aug 5, 2017·Environmental Science and Pollution Research International·Yu YangSatoshi Takizawa
Mar 10, 2020·Organic & Biomolecular Chemistry·Naiguo XingLing He
Jan 10, 2002·Journal of Agricultural and Food Chemistry·P LeoneJ Cornejo
Sep 4, 2003·Journal of Agricultural and Food Chemistry·Jerome B WeberL R Swain

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