2012
DOI: 10.2116/analsci.28.1213
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Monosegmented Flow Analysis Exploiting Aqueous Two-phase Systems for the Determination of Cobalt

Abstract: An environmentally safe procedure has been developed for the extraction, separation and determination of metal ions using a monosegmented flow analysis technique that exploits an aqueous two-phase system (ATPS-MSFA). The ATPS-MSFA method was applied for the determination of cobalt, based on the reaction between Co(II) and KSCN, which produces a metallic complex that spontaneously partitions to the top phase of the ATPS composed of poly(ethylene oxide), ammonium sulfate and water. The linear range was 5.00 to 5… Show more

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Cited by 10 publications
(3 citation statements)
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“…The advantages of these systems are that they are mostly composed of water and other constituents that are not toxic or flammable, and that in some cases are biodegradable and recyclable (Rodrigues et al, 2013). Moreover, ATPSs present other features that are attractive from the applicability point of view, such as possibility of linear scale-up, ease of use, low cost, and short times for phase splitting without stable emulsion formation (Rodrigues et al, 2012). Under specific thermodynamic conditions, ATPSs are formed by mixing aqueous solutions of two chemically distinct polymers (Errais et al, 2012), solutions of a polymer and an electrolyte (Souza et al, 2013), or solutions of two electrolytes (de Alvarenga et al, 2015;Bridges et al, 2007), causing the formation of two phases in equilibrium.…”
Section: Introductionmentioning
confidence: 99%
“…The advantages of these systems are that they are mostly composed of water and other constituents that are not toxic or flammable, and that in some cases are biodegradable and recyclable (Rodrigues et al, 2013). Moreover, ATPSs present other features that are attractive from the applicability point of view, such as possibility of linear scale-up, ease of use, low cost, and short times for phase splitting without stable emulsion formation (Rodrigues et al, 2012). Under specific thermodynamic conditions, ATPSs are formed by mixing aqueous solutions of two chemically distinct polymers (Errais et al, 2012), solutions of a polymer and an electrolyte (Souza et al, 2013), or solutions of two electrolytes (de Alvarenga et al, 2015;Bridges et al, 2007), causing the formation of two phases in equilibrium.…”
Section: Introductionmentioning
confidence: 99%
“…On the other hand it is well known that anionic transition metal complexes formed from SCN − and metal ions such as Fe 3+ , Co 2+ , Cu 2+ , Hg 2+ can form ion pairs with protonated nitrogen bases such as the alkaloids cocaine or atropine thus enabling liquid(water)‐liquid(organics) extraction methods for isolation and detection of these bases . Related liquid‐liquid extraction (LLE) was also reported for the recovery and detection of metal ions by using SCN − and suitable (large, organic) cations . At the same time the binding of the metal cations to cocaine base in such black powder might modify essential properties of cocaine such as solubility or hamper detection.…”
Section: Introductionmentioning
confidence: 99%
“…[2][3][4][5][6][7][8][9] Related liquid-liquid extraction (LLE) was also reported for the recovery and detection of metal ions by using SCN À and suitable (large, organic) cations. [10][11][12][13][14][15] At the same time the binding of the metal cations to cocaine base in such black powder [16][17][18] might modify essential properties of cocaine such as solubility or hamper detection.…”
Section: Introductionmentioning
confidence: 99%