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چکیده
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Arsenic contamination is a leading environmental problem. thus, levels of this toxic metalloid must be constantly monitored by reliable and low-cost methodologies[1]. Arsenic contamination can cause serious health problems; including cardiovascular disease, type II diabetes, canser of skin, lung and kidney. Arsenic affects human health through drinking water or eating foodstuffs, so the link between arsenic and our health is not only limited to scientific research but also have been turned into a worldwide critical public concern [2]. Existing methods for analysis of As (III) including various spectroscopic, ICP and electrochemical teqniques [3]. Such as electrothermal atomic absorption spectrometry (ETAAS) [4] chromatographic separation coupled with ICP-MS [5]. Because the currently accepted upper limit for arsenic in water is 10 ppb, very sensitive and selective detection strategies must be developed[1]. In this study, chitosan graphene quantum dots is synthesized as packed sorbent in syringe for microextraction of As(III) in water and real samples. As(III) ions are adsorbed on chitosan graphene quantum dots because of the functional groups on chitosan and very small absorbent particles. The analyte ions were eluted using acid and analyzed via graphite furnace atomic absorption spectroscopy. Several factors that may affect the preconcentration and extraction process, including sample pH, sorbent amount, number of sample loading times and number of desorption times were optimized.
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