Alternative extraction for separation of trace Chromium (VI) by 2-Aminopyridine/Graphene oxide nano-plates in water samples

A simple method has been developed for the preconcentration of chromium (VI) based on the adsorption of its modified by2-aminopyridine/graphene oxide nano-plates.A novel and selective method has been developed for the fast determination of trace amounts of chromium (VI) ions in water samples .The procedure is based on the selective formation of chromium (VI) ions using modified 2-aminopyridine/graphene oxide nano-plates at different pH values followed by elution with organic eluents and determination by atomic absorption spectrometry The preconcentration factor was 20. The limit of detection of the proposed method is 9.7 ng mL-1. The maximum sorption capacity of the sorbent under the optimum conditions has been found to be 5mg of chromium (VI) per gram of sorbent. The relative standard deviation under the optimum conditions was 2.5% (n = 10). Accuracy and application of the method was estimated by using the test samples of natural and synthetic water spiked with different amounts of chromium (VI) ion.