Simultaneous Determination of Fe(III) and Fe(II) Ions via Complexation with Salicylic Acid and 1,10-Phenanthroline in Microcolumn Ion Chromatography

Abstract

Fe(III) and Fe(II) ions were separated and determined via in-column and post-column reactions with salicylic acid and 1,10-phenanthroline by microcolumn ion chromatography with UV-Vis detection. The separation could be achieved on a silica microcolumn using an aqueous ethanol solution of salicylic acid as eluent. The effluent from the column was then mixed with aqueous ethanol solution of 1,10-phenanthroline and detected at 518 nm. Fe(III) ion was detected as the complex with salicylic acid, whereas Fe(II) ion was detected as the complex with 1,10-phenanthroline. The detection limits with 0.25 mL injection volume at S/N = 3 were 0.21 and 0.10 mg L -1 for Fe(III) and Fe(II), respectively. Increasing the injection volume of sample, e.g., 5.1 mL, improved the sensitivity; the detection limits at S/N = 3 were 12 and 9.2 mg L -1 for Fe(III) and Fe(II), respectively. The present system was applied to the determination of iron in a local well water sample.

Trace metal characterization of aerosol particles and cloud water during HCCT 2010

“…be emitted from exhaust gas (Pakkanen et al, 2003) and also car brake linings and tire wear in urban aerosols (Maenhaut et al, 2005). Zn, As, Se, and Pb have been observed from high-temperature combustion processes such as coal combustion or waste incineration processes as well as from nonmetallurgic industrial processes (Belis et al, 2013;Minguillon et al, 2007;Pacyna et al, 2007). The correlations observed between Zn, As, Pb, and elemental carbon further support the likely influence of such sources.…”

“…Using this instrument, transition metal ions such as Fe(III), Fe(II), Cu(II), and Mn(II) can be determined via post-column derivatization simultaneously. This is performed via a procedure similar to the one reported by Oktavia et al (2008), however using a 4-(2-pyridylazo) resorcinol (PAR, P/N 039672) as post-column reagent. This combination renders a good separation of the abovementioned ions making the analysis easier to handle.…”

New method for simultaneous determination of Fe(II) and Fe(III) in water using flow injection technique

“…The most common analytical method applied to Fe speciation is UV/Vis spectrophotometry [1][2][3][4][5][6][7][8][9][10][11]; however, examples of application of other techniques, e.g. differential pulse anodic stripping voltammetry [12], amperometry and differential pulse polarography [13,14], ICP [15], AAS [16,17] as well as combination of spectrophotometry and AAS [18,19] were also reported.…”

“…Recently, a system coupled to microcolumn ion chromatography has been reported [10]. In this approach Fe(III) and Fe(II) were separated on a silica microcolumn, complexed with salicylic acid and 1,10-phenanthroline, respectively, and determined on the basis of separate signals measured spectrophotometrically.…”

Double-sided Microfluidic Device for Speciation Analysis of Iron in Water Samples: Towards Greener Analytical Chemistry

“…Such assessments would need to be carried out either in fields or immediately after collecting samples, because Fe 2+ tends to rapidly oxidize and become Fe 3+ . There are numerous analytical techniques used for iron speciation, such as ion chromatography, [4][5][6][7][8][9] flow-based analysis, [10][11][12][13][14][15] solvent extraction and flame atomic absorption spectrometry (AAS), 16 voltammetry, [17][18][19] and fluorescence spectrophotometry. 20 However, apart from some flow-based analysis systems, these techniques are infrequently used in field work due to the instrument size and a non-portable nature.…”