Effect of organic matter on the adsorption and release of copper in some gypsiferous soils in Salah al-Din Governorate

Abstract

A laboratory experiment was conducted to study the behavior of copper in gypsum soils of different organic sources through a number of experiences, and knowledge of copper adsorption and release conditions in it, and used three equations physicochemical Langmuir, Freundlich, and Temkin. It was adopted The coefficient of determination (R2 ) is a better choice equation to describe the adsorption of copper, the results showed that the Langmuir equation was enough for the description and evaluation of copper adsorption compared to the rest of the physicochemical equations used according to the highest coefficient of determination R2, and the efficiency of R2 was (92, 87, 65) % for each of the Langmuir and Freundlich equations and Temkin, respectively. The maximum adsorption values of the Langmuir equation were (61.728 - 25,906) mg.kg-1 and a bonding energy (0.731 - 0.128) L.mg-1, and Freundlech's equation showed the maximum adsorption values (1.346 - 0.855) L.mg-1 and a bonding energy (15.160 - 4.010) mg.kg-1, while the maximum adsorption values were to equation Temkin range between (35 - 29) mg.kg-1 energy connectivity ranging what between (0.495-0.185) L.kg-1, and from equation Temkin can that define type adsorption physical or a chemist and on the most chemical calendar for height valuable heat interaction bT, which ranges from (84.86 - 70.34). As for the results of liberating copper adsorbed, the highest values of liberated copper were recorded at. Levels add high from copper (50,100,150) mgkg-1 and at levels low add from copper (2,5,10) mgkg-1 be valuable Liberation copper zero (nill).