This study is the development of a new solid phase extraction method based on using magnetic multiwalled carbon nanotubes impregnated with 1-(2-pyridylazo)2-naphthol (PAN) for separation, preconcentration, and flame atomic absorption spectrometric determination of Pb(II) and Cu(II). Optimization of the method was done by investigating pH effect, amount of magnetic multiwalled carbon nanotubes impregnated with PAN, eluent type and volume, matrix effects, and volume of the sample. The optimum adsorbent amount was found to be 75 mg and the optimum pH value was found as . The detection limits were μg L-1 for Pb(II) and μg L-1 for Cu(II). | Turkish Journal of Chemistry Turk J Chem 2021 45 210-218 http chem TÜBİTAK Research Article doi kim-2009-26 Vortex-assisted magnetic solid phase extraction of Pb and Cu in some herb samples on magnetic multiwalled carbon nanotubes 1 1 2 Dilek KAMAŞ Aslıhan KARATEPE Mustafa SOYLAK 1 Department of Chemistry Faculty of Arts and Science Nevşehir Hacı Bektaş Veli University Nevşehir Turkey 2 Department of Chemistry Faculty of Sciences Erciyes University Kayseri Turkey Received Accepted Published Online Final Version Abstract This study is the development of a new solid phase extraction method based on using magnetic multiwalled carbon nanotubes impregnated with 1- 2-pyridylazo 2-naphthol PAN for separation preconcentration and flame atomic absorption spectrometric determination of Pb II and Cu II . Optimization of the method was done by investigating pH effect amount of magnetic multiwalled carbon nanotubes impregnated with PAN eluent type and volume matrix effects and volume of the sample. The optimum adsorbent amount was found to be 75 mg and the optimum pH value was found as . The detection limits were μg L-1 for Pb II and μg L-1 for Cu II . The relative standard deviations RSD were less than 4 . Two certified reference materials SPS-WW2 wastewater and NCS-DC73349 bush branches and leaves were used to test the validation of the method. The method was successfully applied to the analysis of Pb II and Cu II ions in daisy mint paprika sage rosemary daphne leaves heather green tea and Viburnum opulus samples. Key words Magnetic solid phase extraction multiwalled carbon nanotubes preconcentration flame atomic absorption spectrometry copper lead 1. Introduction In recent years people tend to use some herbal teas as an alternative medicine to keep their health good or to heal the diseases such as cancer depression liver diseases colds insomnia and diabetes 1 . Herbal medicines are popular due to
