RESUMEN
The present paper proposes a pre-concentration procedure for determination of lead and iron in several samples by flame atomic absorption spectrometry. In it, lead(II) and iron(III) ions are coprecipitated using the violuric acid-copper(II) system as collector. Afterwards, the precipitate is dissolved with 1M HNO3 solution and the metal ions are determined. The optimization step was performed using factorial design involving the variables: pH, violuric acid mass (VA) and copper concentration (Cu). Using the optimized experimental conditions, the proposed procedure allows the determination these metals with detection limits of 0.18 microg L(-1) for iron and 0.16 microg L(-1) for lead. The effects of foreign ions on the pre-concentration procedure were also evaluated and the results demonstrated that this method could be applied for determination of iron and lead in several real samples. The proposed method was successfully applied to the analysis of seawater, urine, mineral water, soil and physiological solution samples. The concentrations of lead and iron achieved in these samples agree well with others data reported in the literature.
RESUMEN
Lymphangioma of the ovary is a very rare tumor which is usually silent and identified incidentally at operation or autopsy. We report on a 61-year-old woman with lymphangioma of the ovary and review the relevant literature. The microscopic examination of the left ovary revealed numerous vascular spaces of different dimensions of which the inner surfaces were lined with flattened endothelial cells with neither cellular atypia nor extraluminal or intraluminal proliferation. There was no evidence of haemorrhage or necrosis. The stroma was formed by fibrocollagenous tissue infiltrated by rare lymphocytes. The cells lining vascular spaces were immunoreactive for CD31 by immunohistochemical staining.
