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Determination of Lead by Hydride Generation Atomic Absorption Spectrometry
 Vošmiková, Anna ; Hraníček, Jakub (advisor) ; Rychlovský, Petr (referee)
EN This diploma thesis presents the results of determination of lead amount in aqueous samples using chemical a electrochemical hydride generation methods. Both chemical and electrochemical generation methods are widely used for elemental analysis of the hydride forming elements in trace and ultra-trace levels. First of all the electrochemical generation method was used with HCl (1,0 mol dm-3 ) as anolyte. Determined analyte with the relevant concentration was added into the HCl solution (equal concentration). During the optimization experiments the electrochemical generation method was performed in different setups and constructions (eg. membrane, and non-membrane cells, different electrode materials). Also different acids (HNO3, H2SO4) of different concentrations were tested. Unfortunately achieved results were not satisfied and reproducible. Therefore, chemical generation method was used to provide relevant results. Determination of lead was performed in both and continuous flow and flow injection mode. A crucial step for chemical hydride generation insisted in usage of hexacyanoferrate (III) (17 % m/v solution for FIA and 2 % m/v solution for continuous flow) in solution of HCl on the relevant concentration. It was found that, K3[Fe(CN)6] significantly increases the efficiency of the chemical...
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