Removal and Preconcentration of Cobalt Ions from Aqueous Media Using ImHA Packed Column by On-Line SPE System

Abstract

This work assesses the use of immobilized humic acid (ImHA) onto aminopropyl silica (APS) as a sorbent for the removal and preconcentration of trace amounts of cobalt ions by on-line solid phase extraction (SPE) technique in the column system prepared in our laboratory. Different parameters, such as the effect of the pH, concentration, and flow rate, were studied and throughput was observed by a UV detector. All SPE steps were monitored by breakthrough curves used to visualize distribution of cobalt concentration between mobile and solid phase. The solutions collected from stripping steps were analyzed in atomic absorption spectrometer (AAS) and the amount of sorbed ions was calculated. Sorption characteristics were evaluated by using common adsorption isotherms and Scatchard plot analysis. From the obtained results, it was seen that sorption mechanism of cobalt ions were fitted to Langmuir model on a large scale and thought to be localized. Mean free energy (E0 40.82 kJ mol −1) calculated from D-R isotherm showed that chemical interactions are more effective than physical interactions. This investigation reveals a new, simple, environmentally friendly, and costeffective method for removal and preconcentration of cobalt ions from aqueous solutions by a new aminopropyl silica-immobilized humic acid material.

Iron(II) ion imprinted polymer for Fe(II)/Fe(III) speciation in wine

“…The adsorption capacity of non-IIP toward Fe(II) was lower than that of Fe(II)-IIP and suggests that non-IIP does not possess specific adsorption abilities toward Fe(II). These results of Schatchard analysis are typical for a pair of the imprinted and non-imprinted polymers obtained by the non-covalent approach [30,31]. Table 3.…”

Evaluation of new silica‐based humic acid stationary phase for the separation of tocopherols in cold‐pressed oils by normal‐phase high‐performance liquid chromatography

“…Aminopropyl silica (APS) from Fluka (Buchs, Switzerland), with a mean particle size of 15–35 μm and mean pore diameter of ∼9 nm was used as support for immobilization of HA by applying the procedure of Ayyildiz et al . The Sodium form of humic acid (NaA) was purified and converted into its protonated form (HA) before use.…”

“…On the contrary, any preparation step that may cause loss of tocopherols is not necessary for HPLC analyses. Therefore, RP‐HPLC or NP‐HPLC separations with UV and/or fluorescence detections (FLD) have been mostly used . NP‐HPLC columns provide the separation of all tocopherols, while RP columns do not completely separate β‐ and γ‐tocopherols when the usual octadecylsilane‐modified silica (C 18 ) was used.…”

New potential humic acid stationary phase toward drug components: Development of a chemometric‐assisted RP‐HPLC method for the determination of paracetamol and caffeine in tablet formulations

“…They contain hydrophobic, hydrophilic, aromatic, ionizable, and electron‐donor chemical groups such as phenolic and alcoholic hydroxyl (–OH), aromatic and aliphatic carboxyl (–COOH), ketonic and quinoid carbonyl (C=O), amine (–NH 2 ), etc, are forms of humic substances in soluble in alkaline aqueous media but precipitate in acidic aqueous media . Because HAs have different chemical groups, they are also bonded to the solid support such as silica particles by physical and chemical means such as immobilization . Immobilized HAs onto silica particles were used as a stationary phase in multimode separations such as tocopherols in cold‐pressed oils, organic pollutants taken by soils and sediments, polar compounds including four alkaloids and clenbuterol and some low‐molecular‐weight polar compounds (i.e.…”

“…Immobilized HAs onto silica particles were used as a stationary phase in multimode separations such as tocopherols in cold‐pressed oils, organic pollutants taken by soils and sediments, polar compounds including four alkaloids and clenbuterol and some low‐molecular‐weight polar compounds (i.e. some nucleosides and nucleobases), and removal of metal ions from aqueous media .…”