J. Mater. Environ. Sci. 5 (2) (2014) 571-580 Jodeh et al. ISSN: 2028-2508 CODEN: JMESCN 571 Adsorption and Kinetics Study of Abamectin and Imidacloprid in Greenhouse Soil in Palestine Shehdeh Jodeh 1* , Osamah Khalaf 1 , Ahmad Abu Obaid 1 , Belkheir Hammouti 2 , Taibi B. Hadda 3 , Wade Jodeh 1 , Marwan Haddad 4 , Ismail Warad 1 1 Department of Chemistry, AN-Najah National University, P. O. Box 7, Nablus, State of Palestine. 2 LCAE-URAC18, Faculty of Sciences, University Mohammed Premier, Oujda-60000, Morocco. 3 Laboratoire LCM, Faculty of Sciences, University Mohammed Premier, Oujda-60000, Morocco. 4 Departm Water and Environment Institute, AN-Najah National University, P. O. Box 7, Nablus, State of Palestine. Received 6 Nov 2013, Revised 9 Dec 2013, Accepted 9 Dec 2013 * Corresponding Author: E-mail: sjodeh@najah.edu . Abstract 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. Keywords: Abamectin, Imidacloprid, Adsorption, Pesticides, Residue 1. Introduction Abamectin is the common name for avermectin B1, a naturally occurring miticide/insecticide, derived from the soil microorganism, Strewtomvces avermitilis [1]. The pesticidal activity of abamectin is related to the interaction with the nerve transmitter, gamma aminobutyric acid [2]. A breakdown product (a delta 8,9-isomer) of abamectin is formed in plants by a reaction with sunlight, and this compound has similar toxicological properties as abamectin. Imidacloprid is a systemic, chloronicotinoid insecticide, which kills insects via ingestion or contact. It is effective by disrupting the nervous system of an insect pest. It is used for controlling sucking insects, soil insects, termites, and some chewing insects. It is applied as a seed and soil treatment, crop and structural treatment, and a topical flea control treatment on domestic pets [1-3]. Pesticide residue refers to the pesticides that may remain on or in food after they are applied to food crops [3]. Many of these chemical residues, especially derivatives of chlorinated pesticides, exhibit bioaccumulation which could build up to harmful levels in the body as well as in the environment [4]. Environmental exposure of humans to agrichemicals is common and results in both acute and chronic health effects, including acute and chronic neurotoxicity (insecticides, fungicides, fumigants), lung damage, chemical burns, and infant methemoglobinemia (nitrate in groundwater). A variety of cancers also have been linked to exposure to various pesticides, particularly hematopoietic cancers [4]. Sorption-desorption processes are important in determining the fate and distribution of agrochemicals in the soil/water environment because they determine the amount of pesticide that can reach the target organism and the amounts that can be volatilized, degraded, or leached. While sorption is affected by the physical and chemical properties of the pesticide and soil, it also appears that sorption may be affected by the residence time in the soil [5]. The high molecular weight of the AVMs (>800 daltons) leads liquid chromatography as the most suitable chromatographic technique for determination. Liquid chromatographic methods using