, Ahmad Abu Obaid

Imidaclopid and abamectin are the most pesticides used in Palestine for agricultural purpose. Those pesticides released some amount to the soil and this will affect both soil and groundwater. Results indicate that the highest percentage of imidacloprid and abamectin removal was 13.4 % and 7.5 % respectively when adsorbent dosage was 3.0 g. At low pH of 1.5 the percentage of imidacloprid removal increases reached to 12.3 %, but the decrease of imidacloprid removal at high pH of 12 is highly extreme reached to 7.3 %. At high pH "12 " the percentage of abamectin removal increases reached to 14.4 %, but the lowest percentage of abamectin removal at pH 7 reached to 9.1 %. The effect of temperature on adsorption by soil has also been investigated in the range of 15–47°C. The investigation of adsorption behavior of the two pesticides on soil, was studied using both Langmuir and Freundlich isotherms were used to explain equilibrium adsorption, from these isotherms it was evaluated that Langmuir isotherm was obeyed well