Thallium: A Polluting Metal of New Generation. Its Voltammetric Determination in Herbal Medicines in Presence of Metal Interferences

The present paper reports a new application: the voltammetric determination in herbal medicines of ultra-trace thallium(I), presence lead(II), tin(II) and antimony(III) as interfering metals, by square wave anodic stripping voltammetry (SWASV). A conventional three-electrodes cell was employed with stationary hanging mercury drop electrode (HMDE) working platinum an Ag|AgCl|KClsatd. auxiliary reference electrodes, respectively. supporting electrolyte 0.5 mol L−1 ammonium citrate buffer pH 6.5 + 7.3·10−3 EDTA-Na2. analytical procedure verified analysis standard materials: spinach Leaves NIST-SRM 1570a tomato leaves 1573a from National Institute Standards Technology. Precision trueness, expressed relative deviation error, respectively, were generally lower than 7% all cases. Once set up on materials, transferred applied to samples—Taraxacun officinale weber, Eucalyptus globulus Harpagophytum procumbens DC—sold market. critical comparison spectroscopic measurements is also discussed.