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Influence of Water and Temperature on Adsorption of Parathion by Soils
Author(s) -
Yaron Bruno,
Saltzman Sarina
Publication year - 1972
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1972.03615995003600040026x
Subject(s) - parathion , adsorption , chemistry , hexane , soil water , aqueous solution , desorption , environmental chemistry , chromatography , organic chemistry , pesticide , soil science , geology , agronomy , biology
Temperature and water effect on the adsorption of parathion ( O, O ‐diethyl O‐p ‐nitrophenyl phosphorothioate) by soils was studied using 14 C‐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.