Combined cation-exchange and solid phase extraction for the selective separation and preconcentration of zinc, copper, cadmium, mercury and cobalt among others using azo-dye functionalized resin

Ex Cathedra Immobilization of 8-Hydroxyquinoline to Inorganic Carriers via a New Silane Coupling Reagent for Extractive Sample Cleanup of Iron(III)

“…Flow rate and sorption is an iterative of inverse relationship. 39,40 It was found to be well balanced up to 10 mL•min −1 , and retention of Fe(III) was quantitative. It was also observed that extraction of Fe(III) increases with the initial increase in pH, gets quantitative with a maximum at pH 1.90 ± 0.15, and drops rapidly with an additional increase in pH (Figure 5c).…”

“…On the other hand, Fe(III), present as [Fe(OH)(H 2 O) 5 ] 2+ at the recommended pH (1.90 ± 0.15) for extraction, would have been able to bind at 280 μmol•g −1 HOMO (the electrondonating center) of the extractor. 38,39 In such cases, the calculated value 38,39 (i.e., BTC = [amount of HOMO] × x = 280 μmol•g −1 , i.e., 1.50% w/w; here, x = 1, as Fe(III) exists as a mononuclear species) would have been in good harmony with the experimental findings so far obtained (the maximum column uptake capacity, i.e., BTC, the Langmuir Q 0 , and the outcomes of EDX analysis, Figure 1b 1b(ii)).…”

“…In the present work, we have developed HQ-immobilized SG (HQ@R-{SiO 2 } n , where R stands for m –NN–C 6 H 4 –NH–Si(Me) 2 ) for selective sample cleanup of Fe­(III) from its congeners. The immobilization was performed by instantaneous attachment of HQ to the inert inorganic carrier (SG) via a new silane coupling agent, dimethyldichlorosilane (DMDCS). − This new silane coupling reagent simultaneously couples SG and m -nitroaniline and quantitatively produces a stable nitro compound, {SiO 2 } n –O–Si­(Me) 2 –NH–C 6 H 4 –NO 2 . This first step is an instantaneous reaction that needs no refluxing, filtration, or other Weetall–Hill conditions − and also replaces the first three steps of the Weetall–Hill reaction − by a one-pot, single-step reaction.…”

Radionuclide X-ray fluorescence spectrometry of medical plant samples

“…The aim of the experiment is searching of a suitable carrier which ensures lower detection limits and reduced non-analytical signal. Besides, this thin layer should also provide next requirement such as a preconcentration of the examined analyte (Alvarez et al, 2004;Karapete et al, 2002;Hou et al, 2003;Pehlivan and Altun, 2007;Chatterjee et al, 2016). Note that the chelating membrane used in our work for this purpose -Empore TM Extraction Disks with chelating resin, (based on Iminodi acetate functionalized Poly[styrenedivinylbenzene]), fulfills above mentioned important methodological criterions.…”

Column Solid Phase Extraction of Ni(II) and Cu(II) Using Salicylaldehyde-Modified Polyamine Polyurea Resin for Their Determination by FAAS in Waters

“…To eliminate these difficulties, separation and preconcentration methods, including solvent extraction (ASE) (15), liquid-liquid extraction (LLE) (16), supercritical fluid extraction (SFE) (17), pressurized liquid extraction (PLE) (18), cloud point extraction (CPE) (19), and solid phase extraction (SPE) (20-23) have been widely investigated in recent years (24)(25)(26). Among these methods, solid phase extraction (SPE) is commonly performed due to its selective properties such as uncomplicated nature, low cost, high recovery, selectivity, and enrichment factor (3,(27)(28)(29)(30). The success of SPE is closely associated with the nature of the solid phase used as the sorbent (31).…”