Separation and Preconcentration of Cobalt after Sorption onto Amberlite XAD-2 Loaded with 2-(2-Thiazolylazo)-p-cresol

Abstract

Analytical chemists frequently receive samples that cannot be analyzed in the natural state, due to the presence of interferences and/or inadequate sensibility of the available analytical methodology. Previous steps for separation and enrichment are almost always necessary, and many procedures have been proposed. The process, involving extraction in solid phase, has received more acceptance due to a number of possible advantages, including the availability and easy recovery of the solid phase, attainability of large preconcentration factors and the facility for separation and enrichment using systems with continuous flow. Besides, they usually do not need organic solvents, which may be toxic. For cobalt adsorption determination, several procedures have been proposed involving polyurethane foam 1 , activated carbon 2,3 , Amberlite XAD-4 resin 4,5 , naphthalene 6 and C 18 -bonded silica gel column; 7,8 other techniques as coprecipitation using indium hydroxide as colector 9 , liquid-liquid extraction 10 and cobalt separation as complex and filtration with a menbrane filter.

Preparation, characterization, and Zn2+ adsorption behavior of chemically modified MCM-41 with 5-mercapto-1-methyltetrazole

“…Using silica gel as support N f max values found in the literature ranged from 0.004 mmol/g (acid alizarin violet N as ligand) to 0.18 mmol/g (1,8-dihydroxyantraquinone) [43][44][45]. When the support used was amberlite N f max values ranged from 0.008 mmol/g (8-benzenesulfonoamide quinoline) to 0.17 mmol/g (tiron) [46][47][48][49][50][51][52][53][54][55][56][57][58]. On the other hand, for a mesoporous silica (HMS) functionalized with 1,4-bis-[3-(trimethoxysilyl)-propyl]ethylenediamine, Hossain and Mercier [24] obtained a loading capacity between 0.9 and 1.1 µmol/g.…”

Speciation and Determination of Heavy Metals in Lake Waters by Atomic Absorption Spectrometry after Sorption on Amberlite XAD-16 Resin

“…Among these techniques used in trace element determination, adsorption is one of the most widely used. For this purpose, commercially available Amberlite XAD copolymers [13][14][15][16] have been widely used as adsorbents suitable for multielement preconcentration from different matrices, because of their purity and good adsorption properties. Amberlite XAD-16 resin is an adsorbent based on polystyrene divinylbenzene-copolymer.…”

Optimization of the preconcentration system of cadmium with 1(2-thiazolylazo)-p-cresol using a knotted reactor and flame atomic absorption spectrometric detection

“…The 2-(2-thiazolylazo)-p-cresol (TAC) reagent forms insoluble chelates with numerous metal ions. For preconcentration procedures, it was used in liquid liquid extraction for iron determination [29] and for solid phase extraction for cobalt determination [30]. However, it was not used for preconcentration systems, using KR.…”