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A sensitive flow injection system for lead determination in water and blood samples by HG-AFS
LUZ OLIVIA LEAL QUEZADA
Acceso Abierto
Sin Derechos Reservados
Lead
Atomic fluorescence
Lead (Pb) is a heavy metal whose toxic properties are well documented. An excess of ingested lead poses a health risk affecting both the nervous system and biosynthesis of hemoglobin. A simple and sensitive flow-injection system coupled to hydride generation atomic fluorescence spectrometry (HG-AFS) was developed for ultra-trace lead determination. Plumbane (PbH4) was generated utilizing two methods: in one of them was employed 5% (v/v) H2O2 as an oxidant with 1.5% (m/v) KBH4 as a reducing agent and 1.5% (v/v) HCl solution. The second method involved 1.5% (m/v) K3[Fe(CN)6] as an oxidant/sensitizer, 1% (m/v) KBH4 and 1.5% (v/v) HCl. Variables such as sample and reagent volumes, flow rates and reagent concentrations were tested. The best results were obtained with potassium ferricyanide K3[Fe(CN)6], with a detection limit of (0.03 mg L−1) and a RSD of 1.1%. A study of interferences of the most common interfering ions was also performed. The proposed method was validated by means of certified reference materials (CRM), which are in good agreement with the certified values. Real samples such as tap water, mine water and human blood were also measured. This method offers some advantages over conventional laboratory techniques such as optimum sensitivity, higher sample throughput and the decrease of reagents and sample consumption.
2011
Memoria de congreso
Inglés
OTRAS
Versión revisada
submittedVersion - Versión revisada
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