Adsorption and Desorption of Atrazine, Deethylatrazine, Deisopropylatrazine, and Hydroxyatrazine on Levy Wetland Soil

• Published in: Journal of agricultural and food chemistry 1996-07, Vol.44 (7), p.1925-1929
• Main Authors: Mersie, Wondi, Seybold, Cathy
• Format: Article
• Language: English
• Subjects: ADSORCION; ADSORPTION; Animal, plant and microbial ecology; Applied ecology; ATRAZINA; ATRAZINE; Biological and medical sciences; DESORCION; DESORPTION; DISPONIBILIDAD DE NUTRIENTES; DISPONIBILITE D'ELEMENT NUTRITIF; Ecotoxicology, biological effects of pollution; Fundamental and applied biological sciences. Psychology; METABOLITE; METABOLITOS; SOL DE TERRES HUMIDES; SORCION; SORPTION; SUELO DE TIERRAS HUMEDAS; Terrestrial environment, soil, air
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf950370k

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