Influence of Water and Temperature on Adsorption of Parathion by Soils
1972
Yaron, B. (Bruno) | Saltzman, Sarina
Temperature and water effect on the adsorption of parathion (O, O-diethyl O-p-nitrophenyl phosphorothioate) by soils was studied using ¹⁴C-tagged parathion. The parathion was applied in aqueous solutions and in hexane over a concentration range of 1–10µg/ml. It was found that the parathion is adsorbed by soils from aqueous solution without any appreciable thermic effect. In a dry soil-hexane-parathion system the slightly polar parathion molecules efficiently compete with the apolar hexane molecules for adsorption sites. In hydrated soil-hexane-parathion systems there was no parathion adsorption. Generally as the soil water content increases, parathion adsorption decreases. The water-temperature composite effect in a soil-hexane-parathion system was also studied. The rise of temperature in the soilhydrated parathion-hexane system favors the endothermic process of water desorption, resulting in greater free adsorption sites, and consequently, in increasing parathion adsorption.
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