Simultaneous Pre-concentration and Micro-extraction of Organophosphorus Residues Using Magnetic Nanoparticles and Measuring it by Gas Chromatography Device with Flame Ionization Detector

At the present study, solid phase micro extraction based on nano-magnetite has been studied as a rapid, sensitive and cost effective method through using iron magnetic nanoparticles. The reason for using iron magnetic nanoparticles is because of easy and rapid controlling and isolating the particles using magnetic field . In technique of solid phase micro extraction based on magnetite nanoparticles (MNs). Magnetic nanoparticles have been applied through direct method for extracting and measuring of the organophosphorus pesticides (OPs); diazinon, fenitrothion and malathion from aqueous samples at the same time through using gas chromatography with flame ionization detector. Firstly, magnetic nanoparticles were synthesized from Fe2+/Fe3+ salts using chemical coprecipitation method. Magnetic nanoparticles have been also applied directly for purpose of simultaneous extraction of OPs. Effect of some factors such as pH, aqueous phase volume, stirring rate of extraction and desorption and time of extraction have been investigated. Under optimal conditions, concentration factor was also obtained to 1344, 1257 and 1681 at diazinon, malathion and fenitrothion respectively. The proposed method has been applied for purpose of simultaneous pre-concentration and measurement of OPs in aqueous samples is satisfactorily.