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Type: Artigo de periódico
Title: Potential of porphyrins as chromogenic reagents for determining metals in capillary electrophoresis
Author: Almeda, S
Gandolfi, HE
Arce, L
Valcarcel, M
Abstract: Although capillary electrophoresis (CE) with photometric detection is a well-established technique for the determination of various inorganic ions, its limited sensitivity has hindered greater development in this area. In this work, we used a mixture of metals consisting of Co(II), Ni(II), Zn(II) and Mn(II) to demonstrate that the sensitivity of CE with ultraviolet-visible (UV-vis) detection can be improved by using chromogenic reagents such as porphyrins. To this end, the metals were reacted with 5,10,15,20-tetrakis(4-sulphophenyl)-porphine dodecahydrate (TPPS(4)) to obtain their respective porphyrinato complexes, which were then separated by CE with a citrate buffer and detected at 410 nm. The ensuing electrophoretic method has a limit of detection (LOD) of 3 x 10(-6) M (180 mu g L(-1)) for Co(II), 2 x 10(-10) M (0.012 mu g L(-1)) for Ni(II), 4 x 10(-6) M (260 mu g L(-1)) for Zn(II) and 4 x 10(-9) M (0.219 mu g L(-1)) for Mn(II). The method is a highly promising choice for the ultratrace determination of Ni(II) and Mn(II). (c) 2009 Elsevier B.V. All rights reserved.
Subject: Capillary electrophoresis
River water
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.chroma.2009.06.070
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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