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|Título:||Iron speciation in natural waters by sequential injection analysis with a hexadentate 3-hydroxy-4-pyridinone chelator as chromogenic agent|
Rangel, António O. S. S.
|Palavras-chave:||Hexadentate 3,4-hydroxypiridinone ligand|
Solid phase extraction
Fresh and saline water samples
|Citação:||MIRANDA, J. L. A.; MESQUITA, Raquel B.R.; NUNES, A.; RANGEL, Maria RANGEL, Antonio O.S.S. - Iron speciation in natural waters by sequential injection analysis with a hexadentate 3-hydroxy-4-pyridinone chelator as chromogenic agent. Talanta. ISSN: 0039-9140. (2016) 48, 633-640|
|Resumo:||A sequential injection method for iron speciation in various types of natural waters was developed using a synthesised hexadentate 3-hydroxy-4-pyridinone chelator (CP256). The denticity of the ligand that allow formation of the corresponding iron (III) complex in a 1:1 stoichiometry proved to be highly advantageous, in comparison with parent bidentate, hydroxy-4-piridinone chelators, with a two fold increase of reaction sensitivity and over 65% decrease of the LOD. A solid phase extraction approach was employed to attain matrix elimination, facilitating iron (III) determination and application to high salinity waters. The combination with the total iron determination obtained by the direct reaction of the ligand resulted in iron speciation. Two detection spectrophotometric cells were tested, a conventional flow cell (CFC) and a liquid waveguide capillary cell (LWCC). The dynamic concentration ranges were 0.1–2 mg/L with the CFC detection and 0.005–0.1mg/L with the LWCC, with limit of detection of 30 mg/L and 6 mg/L, respectively. The developed method was successfully applied to a variety of natural waters.|
|Aparece nas colecções:||CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review|
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|JLA Miranda, Talanta148(2016)633–640.pdf||604,54 kB||Adobe PDF||Ver/Abrir Acesso Restrito. Solicitar cópia ao autor!|
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