Please use this identifier to cite or link to this item:
|Type:||Artigo de periódico|
|Title:||Potential of porphyrins as chromogenic reagents for determining metals in capillary electrophoresis|
|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.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.