Data/hora: 02/06/2024 04:30:58

Provedor de dados: | 42
País: | Brazil
Título: | Green speciation of iron using aqueous two-phase system
Autores: | CAMPOS,RAQUEL A.; PATRÍCIO,PAMELA R.; VARGAS,SILVIA JULIANA R.; SILVA,LUIS HENRIQUE M. DA; HESPANHOL,MARIA C.
Data: | 2018-08-01
Ano: | 2018
Palavras-chave: | Aqueous two-phase system; Flame atomic absorption spectrometry; Iron; Speciation; Green chemistry.
Resumo: | Abstract Fe(II) and Fe(III) have distinct chemical and biological functions. Consequently, it is more important to determine the fraction of both oxidation state that knowing the total iron concentration in a sample. However, green methods for iron speciation are still limited. This work uses aqueous two-phase system, a safe alternative to liquid–liquid extraction, to perform the chemical speciation of iron. This method is based on the reaction of Fe(II) with 1,10-phenanthroline extractant, forming a complex of Fe(II)-phenanthroline that concentrates in the top phase of the system. The Fe(III) specie concentrated in the bottom phase of the system. Iron speciation was affected by the electrolyte nature, macromolecule type, quantity of phenanthroline added, and pH. The system formed by PEO1500 + Na3C6H5O7 + H2O at pH 6.00, containing 5.00 mmol kg-1 of phenanthroline, was successfully used to separate the iron species before determination by flame atomic absorption spectrometry. Under these optimal conditions, a separation factor of 233 was obtained between Fe(II) and Fe(III) with extraction percentages of (95.1 ± 1.0)% and (7.68 ± 0.50)%, respectively The proposed method was successfully applied for iron speciation in water samples, and provided recovery percentages ranging between 90 and 106%.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/0001-3765201820170631
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.90 n.2 suppl.1 2018
Fonte: | info:eu-repo/semantics/openAccess