Browsing by Autor "Oswaldo Saavedra"

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    Determinación de plomo en polen apícola de Brassica napus L. del Páramo de Misintá, estado Mérida, Venezuela
    (2007) Agni R. Saavedra; María Luisa Di Bernardo; Carlos Rondón; Luis Gutiérrez; Oswaldo Saavedra; Isbelia González; Patrícia Vit
    Bee pollen is the second product of the comb most consumed, after honey; however, there are no regulations for its quality control in Venezuela. The oligoelements of pollen have been studied for their nutritional, medicinal or toxic functions, and also, as indicators of environmental pollution by the analysis of heavy metals. In this work, the concentration of Pb was evaluated in bee pollen of Brassica napus L. in the state of Merida. The Pb analysis was done by electrothermal atomic absorption spectroscopy (ETAAS). A concentration of 268.31 ± 0.0008 ∝g Pb/kg fresh bee pollen of Brassica napus L. was found. The method for the analysis of lead was validated by recovery studies, a value of 101.0 ± 4,8% was obtained for lead, and the relative standard deviation (RSD%) was lower than 5%, indicating that the method was exact, precise and free of interference.
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    Distribución de metales en el acíbar de hojas de zábila (Aloe vera (L). Burm.f.)
    (2008) Oswaldo Saavedra; Carlos E Rondón
    Se investigó la distribución de Na, Ca, Mg, K, Cu, Zn, Mn y Fe en el acíbar de hojas de zábila por espectrometría de absorción atómica en llama (FAAS) y Cr por espectrometría de absorción atómica electrotérmica (ETAAS). Las plantas fueron cultivadas en la ciudad de Coro, estado Falcón. Las muestras de acíbar se recolectaron en hojas internas, medias y externas de la roseta de la planta. La exactitud del método se evaluó utilizando material certificado NIST 1572. La precisión fue, en promedio, de 1.39%. La metodología empleada fue precisa exacta y libre de interferencias.