Based on the relevant characteristics of the RACNTs,as well as the importance of analyzing lead levels in blood serum samples,a new on-line SPE method for the extraction of Pb2þ ions, directly from these samples,followed by TS-FF-AAS analyses,was developed in this study.High resolution transmission electron microscopy was also used,scanning transmission electron microscopy and energy dispersive spectroscopy were used to investigate the
exact metal adsorption sites in the RACNTs,complementing the previous characterization results presented in our first publication about RACNTs .