Sequential determination of lead and cobalt in tap water and foods samples by fluorescence
| Autor: | Magdalena Alesso, Mariano Acosta, María Carolina Talio, Liliana Patricia Fernandez, Maria Gimena Acosta |
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| Rok vydání: | 2014 |
| Předmět: |
Trace Amounts
Metal ions in aqueous solution Argentina Analytical chemistry chemistry.chemical_element Food Contamination Coffee Fluorescence Analytical Chemistry law.invention LEAD Tap water FOOD law Animals COBALT Detection limit Cacao Aqueous solution Drinking Water Spectrophotometry Atomic Extraction (chemistry) Ciencias Químicas Cobalt Oxyquinoline Milk Lead chemistry LUMINESCENCE 8-HYDROXYQUINOLINE Química Analítica TAP WATER Atomic absorption spectroscopy Water Pollutants Chemical CIENCIAS NATURALES Y EXACTAS Environmental Monitoring |
| Zdroj: | Talanta. 127:244-249 |
| ISSN: | 0039-9140 |
| DOI: | 10.1016/j.talanta.2014.04.020 |
| Popis: | In this work, a new procedure was developed for the separation and preconcentration of lead(II) and cobalt(II) in several water and foods samples. Complexes of metal ions with 8-hydroxyquinolein (8-HQ) were formed in aqueous solution. The proposed methodology is based on the preconcentration/separation of Pb(II) by solid-phase extraction using paper filter, followed by spectrofluorimetric determination of both metals, on the solid support and the filtered aqueous solution, respectively. The solid surfase fluorescence determination was carried out at λem = 455 nm (λex = 385 nm) for Pb(II)-8-HQ complex and the fluorescence of Co(II)-8-HQ was determined in aqueous solution using λem = 355 nm (λex = 225 nm). The calibration graphs are linears in the range 0.14 to 8.03 104 μg L−1 and 7.3× 10−2 to 4.12 × 103 μg L−1, for Pb(II) and Co(II), respectively, with a detection limit of 4.3 10−2 and 2.19 10−2 μg L−1 (S/N = 3). The developed methodology showed good sensitivity and adequate selectivity and it was successfully applied to the determination of trace amounts of lead and cobalt in tap waters belonging of different regions of Argentina and foods samples (milk powder, express coffee, cocoa powder) with satisfactory results. The new methodology was validated by electrothermal atomic absorption spectroscopy with adequate agreement. The proposed methodology represents a novel application of fluorescence to Pb(II) and Co(II) quantification with sensitivity and accuracy similar to atomic spectroscopies. Fil: Talio, María Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Química de San Luis; Argentina Fil: Alesso, Magdalena. Universidad Nacional de San Luis. Facultad de Quimica, Bioquimica y Farmacia. Departamento de Quimica. Area de Quimica Analitica; Argentina Fil: Acosta, Maria Gimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Química de San Luis; Argentina Fil: Acosta, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Química de San Luis; Argentina Fil: Fernandez, Liliana Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Química de San Luis; Argentina. Universidad Nacional de San Luis. Facultad de Quimica, Bioquimica y Farmacia. Departamento de Quimica. Area de Quimica Analitica; Argentina |
| Databáze: | OpenAIRE |
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