Separation, preconcentration and determination of silver ion from water samples using silica gel modified with 2,4,6-trimorpholino-1,3,5-triazin

Preconcentration and Determination of Trace Silver Ion Using Benzothiazole Calix[4]arene Modified Silica by Flow Injection Flame Atomic Absorption Spectrometry

“…It has been widely used because of its compatibility with the AAS technique. However, thiourea and thiosulfate 6,11 were also considered because of their strong chelating properties for several metal ions. 25 In this experiment, 5.0 mL of various types and different concentrations of eluent were added.…”

“…2 Various sorbents such as multi-walled carbon nanotubes (MWCNTs), 3 alumina, 4 activated carbon, 5 polytetrafluoroethylene (PTFE), 6 chelating ions exchange resin 7 and silica gel [8][9][10][11][12][13][14] have been used and studied in SPE. The conventional batch or column procedure for preconcentration based on SPE has proven an effective method, but it is tedious, time-consuming, requires large sample and reagent volume.…”

Ultra‐Trace Silver Determination in Biological and Water Samples by Electrothermal Atomic Absorption Spectrometry after Electrodeposition on a Graphite Probe

“…The direct determination of silver in complex matrix by common methods, such as flame atomic absorption spectrometry (FAAS), 7 electrothermal atomic absorption spectrometry (ETAAS), 8 neutron activation analysis (NAA), 9 inductively coupled plasma atomic emission spectrometry (ICP-AES), 10 is usually difficult because of low concentration of silver and matrix interference and an initial sample pretreatment is necessary. Several different methods, such as liquid-liquid extraction (LLE), 11 cloud point extraction (CPE), 12 and solid phase extraction (SPE), 13,14 have been used for this purpose. Electrodeposition coupled with electrothermal atomic absorption spectrometry has been demonstrated to be a powerful method to attain sensitive and selective determination of ultra-trace analysis in a complex matrix.…”

Silica Gel Chemically Modified with Ethyl-2-benzothiazolylacetate for Selective Extraction of Pb(II) and Cu(II) from Real Water Samples

“…There are several reports concerning sorbent materials for SPE, for example, PS-DVB, 4 mesoporous silica, 5,6 Amberlite XAD resin, 7 carbon nanotube 8,9 and silica gel. [10][11][12][13][14][15][16][17][18][19][20][21][22] Sorbent modification methods can be carried out in many ways, such as the impregnation of a chelating ligand onto the sorbent, modification on an octadecyl silica membrane [23][24][25] and the sorption of a metal-soluble ligand on the activated carbon. 26 However, modifying chelating ligands and fixing them to a solid support, such as silica gel, are practically employed in SPE studies.…”

“…Silica gel has been modified with chelating agents, such as xylenol orange, 10 aminothio-amidoanthraquinone, 11 2,4,6-trimorpholino-1,3,5-triazin, 12 2-aminotiazole, 13 2-mercaptobenzothiazole, 14 3-(1-imidazolyl)propyl, 15 5-formyl-3-(1′-carboxyphenylazo)salicylic acid, 16 8-hydroxyquinoline, 17 tris(2-aminoethyl)amine, 18 gallic acid, 19 and p-dimethylaminobenzaldehyde. 20 Moreover, silica gel can be modified with 1,4-bis(3-aminopropyl)piperazine and a subsequent reaction with methylacrylate to yield a carboxylate chelating moiety.…”