University of Tehran

Performance evaluation of electrocoagulation process for diazinon removal from aqueous environments by using iron electrodes

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Pesticides comprise a variety of toxic substances and are used in agriculture as well as indoors to kill pests. The health risk of pesticides to humans is worsened by the fact that many of these substances have been shown to be carcinogenic and mutagenic. Organophosphorus pesticides (OPPs) have a higher acute toxicity than organochlorines, but they have the advantage of being rapidly degraded in the environment (Zohair, 2001; Legrouria et at., 2005). Organophosphorus pesticides are widely found in water resources. They are released into the environment from manufacturing, transportation and agriculture applications (Honeycutt and Schabcker., 1994). Several investigators found high levels of pesticide residues after the washing and/or safety period (Kariem et at., 1991; Ramadan et at., 1992; Saleh et at., 1993). Organophosphorus pesticides are very toxic when absorbed by human organisms because of acetyl-cholinesterase de activation (Berijani et at., 2006). The European Union (EU) allows a maximum concentration of 0.1 jig/L of each individual pesticide and 0.5 jig/L of the sum of pesticides in drinking water (European Union., 1998). Diazinon is one of the most widely used organophosphate insecticides in agriculture (Gokcimen et at., 2007). Chemical formula of diazinon is C,2H2,N203P5, molecular weight is 304.3 and density (at 20°C) is 1.117 g/mL (Badawya et at., 2006). It is an organophosphorus insecticide classified by the World Health Organization (WHO) as “moderately hazardous” class II.

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