Determination of micro tin in pure copper sample by flow injection hydride generation-atomic absorption spectrometry after cupferron extraction

A new method for the determination of micro tin in pure copper sample by flow injection-hydride generation atomic absorption spectrometry was estiblished.Tin from copper was effectively separated by cupferron extraction.Tin reacted with NaBH4 to form a hydride which was sent to atomizer by closed mobile system and then detected by atomic absorption spectrometry.The optimum conditions of extraction were chosen.The determination wavelength of tin was found to be 286.3 nm.Under the optimum experimental conditions,the liner range is 1.0-13.0 ng/mL and the detection limit was 0.25 ng/mL for tin.The method has been applied to the deterimnation of tin in certified reference materials and the results obtained are in good agreement with certified values,giving the recovery of 90.0 %-97.0 % and the RSD of 3.2%.