The adsorption and desorption of atrazine, and its three metabolites,
deethylatrazine (DEA),
deisopropylatrazine (DIA), and hydroxyatrazine (HA), on Levy wetland
soil were measured using
the batch equilibration technique. Solution concentrations for
each chemical were 1.3, 3.8, 6.6,
and 13.2 μmol L-1. Four 24-h period desorptions
for each concentration were conducted immediately
after adsorption. The adsorption of all the chemicals conformed to
linear isotherms. Adsorption
coefficients decreased in the order HA (109.7) > atrazine (38.6) >
DIA (26.3) > DEA (22.1). The
organic carbon partition coefficients (K
oc) for
HA, atrazine, DIA, and DEA were 1500, 440, 290, and
240 L kg-1, respectively. Percent of chemical
desorbed was about 29% for DEA, 24% for atrazine,
23% for DIA, and 16% for HA. The slopes of all desorption
isotherms were less than their respective
adsorption slopes, indicating hysteresis. Atrazine and its
metabolites were relatively more strongly
adsorbed and the binding was less reversible in the Levy wetland soil
than what has been reported
for agricultural soils.
Keywords: Atrazine; deethylatrazine; hydroxyatrazine
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