Combined cation-exchange and extraction chromatographic method of pre-concentration and concomitant separation of Cu(II) with high molecular mass liquid cation exchanger after its online detection

Facile Synthesis of a Luminescent Material, PAN@{SiO2}n, Having a Simultaneous Binding Capacity of High and Low Oxidation States: HOMO and LUMO, Quantum-mechanical Descriptor of Break-through Capacity

“…Initially, PF rises with an increase in the influent volume, but beyond a certain volume (1200 mL) it diminishes because of the dominance of the second term (Table 1), which takes care of the volume effect. 9 The ion-exchange material by its preconcentration was able to clean up analyte samples in the range of concentration, 5.6 × 10 2 -0.35 × 10 2 mM with a good enrichment factor, optimized at 192 (Table 1). Simultaneous sorption of both the high and low oxidation state.…”

“…11,12 As a result the interaction of metallic ions with the active sites of the exchanger is a function of the solution pH. [6][7][8][9] Thus, systematic studies on the sorption of Cd(II) (10 mM) over the range of pH 5 -8.75 have been made to find out the required selective condition for its quantitative extraction. After extraction, Cd(II) was stripped with 6 mL 0.1 M HNO3, and its amount was determined complexometrically.…”

“…(4))). 9 To investigate the chemical stability and reusability, the resin (FSG-PAN) was treated with different solvents (like DMSO, toluene, acetonitrile) and acids (like HNO3: 8 M, H2SO4: 6 M, HCl: 6 M), and subsequently it was thoroughly cleaned with distilled water. The sorption and desorption cycles were repeated 900 -1000 times with the same adsorbent material, and BTC was found to be decreased by only 1.0 ± 0.2%.…”

“…1,2 Rather than others, [3][4][5][6] the most promising, solid phase extraction (SPE) has recently been used for the preconcentration and separation of metal ions 7 owing to its unique selectivity, eco-friendliness, simplicity, and time-cost effectiveness. [8][9][10] A solid-phase (SP) extractor, silica gel (SG) has a poor selectivity and irreversible nature of binding with metal ions; it works at high pH (>7.5), where it becomes hydrolyzed. 11,12 Thus, functionalized SG (FSG) with greater selectivity is a necessity.…”

“…11,12 Thus, functionalized SG (FSG) with greater selectivity is a necessity. 7,13,14 It is obtained by either coating a high molecular mass liquid cation exchanger (HMMLCE) on silanised SG, 9,13 or by the formation of covalent siloxanes (Si-O-Si) (denoted as grafting) 15,16 through a suitable grafting component (viz. 3-aminopropyltrimethoxysilane, 11 3-mercaptopropyltrimethoxy-silane, 17 allyl-, 18 methallyl-, 19 vinylsilane, 20 isocyanosilane 21 hydrosilanes 16 etc.).…”