M. Fernandez-perez et al., Mobility of isoproturon from an alginate-bentonite controlled release formulation in layered soil, CHEMOSPHERE, 41(9), 2000, pp. 1495-1501
The mobility of isoproturon [3-(4-isopropylphenyl)-1,1-dimethylurea] from a
n alginate-based controlled release (CR) formulation was investigated by us
ing soil columns. A layered bed system simulating the typical arrangement u
nder a plastic greenhouse, which is composed of sand, peat, amended soil an
d native soil was used. The CR formulation was based on sodium alginate (1.
87%), isoproturon (1.19%), natural bentonite (3.28%), and water (93.66%), a
nd was compared to technical grade isoproturon. The use of the alginate-ben
tonite CR formulation produced less vertical mobility of the active ingredi
ent as compared to the technical product. There was no presence of herbicid
e in the leachate when the alginate-bentonite CR formulation was used. Howe
ver, 0.90% of isoproturon appeared when the treatment was carried out with
technical grade material. Isoproturon mobility was modelled using the progr
amme CMLS, which showed the peat layer to retard pesticide leaching. Analys
is of the soil columns showed the highest isoproturon concentration in the
peat layer. (C) 2000 Elsevier Science Ltd. All rights reserved.