Isotherms for the adsorption of sodium dodecyl benzene sulfonate, sodium POE (4) nonyl phenol sulfate, and POE (25) nonyl phenol, on the hydrophobic crystalline herbicides atrazine and cyanazine were determined. Anionic surfactants were measured at 5°, 25°, and 50°C; the nonionic surfactant at 25°C only.Low degrees of surface coverage were observed; in only one case .(atrazine/NaDBS) was monolayer coverage approached.On the other hand, adsorption was accompanied by a significant increase in negative zeta potential.Although DLVO calculations suggest that this adsorption should lead to stable aggregates, these are of such size that gravitational effects overpower the DLVO terms.
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