Green speciation of iron using aqueous two-phase system
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 aqueou...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Academia Brasileira de Ciências
|
| Series: | Anais da Academia Brasileira de Ciências |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929&lng=en&tlng=en |
| _version_ | 1819209622897033216 |
|---|---|
| author | RAQUEL A. CAMPOS PAMELA R. PATRÍCIO SILVIA JULIANA R. VARGAS LUIS HENRIQUE M. DA SILVA MARIA C. HESPANHOL |
| author_facet | RAQUEL A. CAMPOS PAMELA R. PATRÍCIO SILVIA JULIANA R. VARGAS LUIS HENRIQUE M. DA SILVA MARIA C. HESPANHOL |
| author_sort | RAQUEL A. CAMPOS |
| collection | DOAJ |
| description | 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%. |
| first_indexed | 2024-12-23T05:58:13Z |
| format | Article |
| id | doaj.art-abf720a163a54724aa529f4f962a147f |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-12-23T05:58:13Z |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-abf720a163a54724aa529f4f962a147f2022-12-21T17:57:44ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-2690902 suppl 11929194410.1590/0001-3765201820170631S0001-37652018000501929Green speciation of iron using aqueous two-phase systemRAQUEL A. CAMPOSPAMELA R. PATRÍCIOSILVIA JULIANA R. VARGASLUIS HENRIQUE M. DA SILVAMARIA C. HESPANHOLAbstract 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%.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929&lng=en&tlng=enaqueous two-phase systemflame atomic absorption spectrometryironspeciationgreen chemistry |
| spellingShingle | RAQUEL A. CAMPOS PAMELA R. PATRÍCIO SILVIA JULIANA R. VARGAS LUIS HENRIQUE M. DA SILVA MARIA C. HESPANHOL Green speciation of iron using aqueous two-phase system Anais da Academia Brasileira de Ciências aqueous two-phase system flame atomic absorption spectrometry iron speciation green chemistry |
| title | Green speciation of iron using aqueous two-phase system |
| title_full | Green speciation of iron using aqueous two-phase system |
| title_fullStr | Green speciation of iron using aqueous two-phase system |
| title_full_unstemmed | Green speciation of iron using aqueous two-phase system |
| title_short | Green speciation of iron using aqueous two-phase system |
| title_sort | green speciation of iron using aqueous two phase system |
| topic | aqueous two-phase system flame atomic absorption spectrometry iron speciation green chemistry |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929&lng=en&tlng=en |
| work_keys_str_mv | AT raquelacampos greenspeciationofironusingaqueoustwophasesystem AT pamelarpatricio greenspeciationofironusingaqueoustwophasesystem AT silviajulianarvargas greenspeciationofironusingaqueoustwophasesystem AT luishenriquemdasilva greenspeciationofironusingaqueoustwophasesystem AT mariachespanhol greenspeciationofironusingaqueoustwophasesystem |