Abstract:
In this study, the batch equilibrium method was use
d to conduct metribuzin
adsorption/desorption experiments with eight soils
from different regions of Iran. The
results indicated that the organic carbon (OC) cont
ent, clay content, cation exchange
capacity (CEC), and pH had a combined effect on the
metribuzin adsorption on soil.
Under the experimental conditions, the adsorption a
mount of metribuzin on soils was
positively correlated with the content of soil orga
nic carbon. Freundlich adsorption
isotherm provided the best fit for all adsorption an
d desorption data. The values of K
f-ads
,
Freundlich adsorption capacity, ranged from 0.16 to
2.53 L kg
-1
. Soil organic carbon
content and pH were the main factors influencing ads
orption. Adsorption was positively
correlated with OC and negatively correlated with p
H. Metribuzin desorption showed
that almost all of the adsorbed metribuzin was deso
rbed in all soils, except soil 1 and 8.
However, adsorption was not completely reversible.
Keywords:
Hysteresis, Metribuzin, Soil, Soil organic carbon,
Soil pH.
