Cloud point extraction-preconcentration and flame atomic absorption spectrometric determination of low levels of zinc in water and blood serum samples

Abstract

A simple, sensitive and selective flotation method is described for the preconcentration and atomic absorption spectrometric determination of zinc ion in water and blood samples. At a solution pH of 5.2, 4-(2-pyridylazo-resorcinol) and Triton X-114 were used as hydrophobic ligand and non-ionic surfactant, respectively. The chemical variables affecting the preconcentration process were optimized. Under the optimized experimental conditions, the selective preconcentration and determination of as low zinc concentration as 6.5 μg L -1 can be made. The proposed method was successfully applied to the preconcentration and low-level determination of zinc in different water and blood serum samples. Warsaw and Springer-Verlag Berlin Heidelberg. © Versita

Clouding behaviour in surfactant systems

“…Shokrollahi et al [223] developed a new sensitive and selective flotation method for the preconcentration and determination of low levels of Zn 2+ in water and blood serum samples using 4-(2-pyridylazo-resorcinol) (PAR) as hydrophobic chelating agent with the aid of CPT and atomic absorption spectrometry (AAS) in the micellar solution of TX-114 having a detection limit of 6.5 μg L −1 . The extraction efficiency was highly influenced by pH of the medium, concentration of TX-114, ionic strength of the extractant, equilibration time, temperature, centrifugation time and rate.…”

Adsorptive removal of Cr(III) and Fe(III) from aqueous solution by chitosan/attapulgite composites: Equilibrium, thermodynamics and kinetics

“…The concentrations of traces of heavy metal ions in matrices as environmental samples are below the detection limit, a preconcentration-separation procedure is needed to improve the detection limits. The widely used preconcentration-separation methods for heavy metal ions include solvent extraction [2], co-precipitation [3], cloud point extraction [4,5], ion exchange [6], membrane filtration [7] and solid-phase extraction (SPE) [8,9]. Among the preconcentration-separation techniques mentioned above, SPE is one of the efficient techniques for the trace or ultratrace amount of heavy metal ions duo to its simplicity and economy [10].…”

Sorbent extraction of 4-(2-thiazolylazo) resorcinol (TAR)–metal chelates on Diaion SP-850 adsorption resin in order to preconcentration/separation

“…However, there is two main problems in these determinations are lower elements concentrations than the qualification limits of the instrument and the negative or positive effects of concomitant ions [14][15][16][17][18][19]. Generally in order to solve these problems, separation-preconcentration methods including solvent extraction, cloud point extraction, membrane filtration, flotation, electro-deposition and other methods are used by the researchers [20][21][22][23][24][25][26][27].…”