title: Direct determination of Pb(II) and Cd(II) ions as impurities in some homeopathic drugs by using stripping voltammetry.
abstract: The conditions for identification and quantilication of Pb(II) and Cd(II) ions as impurities in homeopathic preparations by stripping voltammetry were established. The tests proved that the method was of high selectivity. The detection limits were 0.78 ng/mL and 1.56 ng/mL for Pb(II) and Cd(II) ions, respectively. The method was characterised by: repeatability of measurements, a wide range of linearity and satisfactory percent recovery. The Pb(II) and Cd(II) ions were detected in examined drugs as impurities at concentrations of 1.23 ? 9.5 ng/mL and 1.66 ? 3.7 ng/mL for Pb(II) and Cd(II), accordingly.
authors.affiliation: Department of Inorganic and Analytical Chemistry, Collegium Medicum of Jagiellonian University, 9 Medyczna Str., 30-688 Kraków, Poland.
authors.forename: Włodzimierz
authors.initials: W
authors.lastname: Opoka
authors.forename: Jan
authors.initials: J
authors.lastname: Krzek
authors.forename: Anna
authors.initials: A
authors.lastname: Kierszniewska
authors.forename: Włodzimierz
authors.initials: W
authors.lastname: Rzeszutko
mesh_terms: D002104:Cadmium / Q000032:analysis*; D004340:Drug Contamination; D004563:Electrochemistry; D007202:Indicators and Reagents; D007854:Lead / Q000032:analysis*; D008419:Materia Medica / Q000032:analysis*; D015203:Reproducibility of Results; D012996:Solutions
chemical_list: D007202:Indicators and Reagents; D008419:Materia Medica; D012996:Solutions; D002104:Cadmium; D007854:Lead