measurement of very small amounts of copper ions after extraction and pre-concentration using carbon based nanocomposite.

: in this study, a carbon-based nanocomposite modified with a sulfur functional group as an adsorbent for pre-concentration of very small amounts of copper (ii) ions from aqueous solutions by solid phase extraction and its measurement using flame atomic absorption spectroscopy is used. parameters affecting pre-concentration and separation of copper ions including ph, type and concentration of detergent, volume of sample and detergent solution and the effect of various disturbances were investigated and optimized. under optimal conditions of the calibration curve, concentration factor, reproducibility of the method and detection limit were calculated. the proposed method was used to extract and measure copper ions in different aqueous samples.