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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1433| STUDIES IN HYDRIDE GENERATION FOR THE DETERMINATION OF TRACE LEVELS OF LEAD BY ATOMIC FLUORESCENCE SPECTROMETRY | |
| LUZ OLIVIA LEAL QUEZADA | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Spectrometry | |
| Two methods were used for the determination of lead at ng L-1 levels by Flow Injection- Hydride Generation-Atomic Fluorescence Spectrometry (FI-HG-AFS). Lead hydride was generated using hydrogen peroxide and potassium hexacyanoferrate (III), both as oxidants agents. A reducing KBH4 solution, HCl solution and the sample were dispensed into a gas-liquid-separator. An argon flow delivered the lead hydride (PbH4) and the hydrogen gas into the flame of an atomic fluorescence spectrometer. Instrument parameters and chemical variables were optimized. A study of interference of the most common ions was also carried out. Analytical curves were obtained for lead determination with hydrogen peroxide between 1 and 80 g L−1, whereas using hexacyanoferrate (III) between 0.5 and 80 g L−1. The detection limit of the proposed technique was 0.42 g L−1 y 0.03 g L−1, respectively. The better results were observed with the hexacyanoferrate (III) as oxidant agent due its accuracy and sensitivity. | |
| 2010 | |
| Libro | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
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