Study of the electrothermal atomization of selenium (IV) in transversely-heated graphite atomizers in the presence of nickel compounds as chemical modifiers |
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| Institution: | 1. Medical Device Inspection Laboratory Verlab Ltd., Sarajevo, Bosnia and Herzegovina;2. Department of Genetics and Bioengineering, Faculty of Engineering and Natural Sciences, International Burch University, Sarajevo, Bosnia and Herzegovina;3. Technical Faculty University of Bihać, Bihać, Bosnia and Herzegovina;1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil;2. Instituto Nacional de Ciência e Tecnologia do CNPq — INCT de Energia e Ambiente, Universidade Federal da Bahia, Salvador, BA, Brazil;3. Departamento de Química, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil |
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| Abstract: | The electrothermal atomization of selenium, in transversely-heated graphite atomizers, was studied with regard to the effect of the addition of nickel nitrate and nickel chloride as chemical modifiers. Particular importance was given to the behavior of the analyte in aqueous standards and in sodium chloride containing solutions, after thermal reduction of the modifiers prior to the injection of the analyte solution into the atomizer. Thermal reduction of either nickel compound brings about an enhancement in the sensitivity of selenium measurements, as compared to those obtained by the injection of both the analyte and the modifier together into the atomizer. Additionally, thermal reduction of the modifiers permits the presence of chloride, as sodium chloride, to be tolerated in amounts as high as 500 μg Cl− with sensitivity losses lower than 10%. |
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