Preconcentration and determination of trace elements with 2-aminoacetylthiophenol functionalized Amberlite XAD-2 by inductively coupled plasma–atomic emission spectrometry

4-(4'-Nitrobenzylideneimino)-3-methyl-5-mercapto-1, 2, 4-triazole, a new chromogenic reagent for extractive spectrophotometric determination of copper (II) in pharmaceutical and alloy samples

“…Among these techniques, the spectrophotometric methods are easier to handle, more sensitive, rapid and involve less expensive instrumentation. [7][8][9][10][11][12][13][14][15][16][17] Therefore, the extraction and spectrophotometric determination of trace amount of copper is significant. The phenyl thiosemicarbazones are the extensively used sulphur and nitrogen containing chromogenic reagents which form stable complexes with Cu (II) and are extracted into organic solvents.…”

Octa-<i>O</i>-Methoxy Resorcin [4] Arene Amberlite XAD-4 Polymeric Chelating Resin for Solid Phase Extraction, Preconcentration, Separation and Trace Determination of Ni(II), Cu(II), Zn(II) and Cd(II) Ions

“…Either the adsorption of chelating ligands onto these supports or the covalent coupling of chelating moiety has been used to design polymeric chelating resins, which are versatile, durable, have good loading capacity towards metals, exhibit enhanced hydrophilicity and flexible working conditions. That is why the reaction of Amberlite XAD resin with suitable chelating agents is very popular for separation and preconcentration [66][67][68][69][70][71].…”

Solid-Phase Extractors Based on 8-Aminoquinoline and 2-Aminopyridine Covalently Bonded to Silica Gel for the Selective Separation and Determination of Calcium in Natural Water and Pharmaceutical Samples

“…[23][24][25][26][27][28][29][30][31][32][33] The efficiency of unmodified silica gel to act as a solid-phase extractor for the removal, separation and preconcentration of heavy metal ions is very low due to the weak interaction between these metal ions and surface silanol groups. 34,35 Thus, the modification of a silica-gel surface through the immobilization of organic complexing agents, either chemically [36][37][38] or physically, [39][40][41][42] Two new silica-gel phases were produced directly via the chemical interaction of 3-chloropropyltrimethoxysilane modified silica gel with 8-aminoquioline, phase I and 2-aminopyridine, phase II under reflux conditions.…”