Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/6/2003
Publication Date: 11/6/2003
Citation: CHAPPELL, M.A., EVANGELOU, V.P., LAIRD, D.A., THOMPSON, M.L. SORPTION OF ATRAZINE FROM COMMERICIAL AND LABORATORY-SIMULATED FORMULATIONS ON SOILS. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI.
Technical Abstract: We studied the sorption behavior of emulsified atrazine in commercial and lab-simulated formulations. Sorbents used were three smectitic soils and the reference smectite Panther Creek bentonite. The effect of background electrolyte type and sample handling on emulsified atrazine sorption were studied. Different lab-simulated formulations were prepared by varying the concentration of the polydisperse nonionic surfactant, lauryl polyoxyethylene alcohol (Brij 35) above and below its critical micelle concentration (80 mg/L). Emulsified atrazine sorption behavior is shown to be considerably different from that of neat atrazine solutions. For the soils, atrazine sorption isotherms (in general) shifted in shape from nearly linear without Brij 35, to concave with 50 mg/L Brij 35, to convex with 200 mg/L Brij 35. With 2000 mg/L Brij 35 (above surface saturation with surfactant), sorption isotherms ranged in appearance from concave to hyperbolic, indicating multiple interactions among the solids, solution, and surfactant phases. Significant differences in emulsified atrazine sorption were observed due to surfactant concentration, sample handling, and background cation type.