Extraction of heavy metal ions from leachate of cement-based stabilized waste using purpurin functionalized resin

Coprecipitation of Ni2+, Cd2+ and Pb2+ for preconcentration in environmental samples prior to flame atomic absorption spectrometric determinations

“…The preconcentration factor found for this work is superior to some coprecipitation methods and other preconcentration techniques [29][30][31][32][33][34][35]. The detection limits of analytes are superior to those of preconcentration techniques [29][30][31][32][33][35][36][37][38][39][40]. The method is relatively rapid as compared with previously reported procedures for the enrichment of analyte ions ( Table 5).…”

Comparison of simple and chelated amberlite IR-120 for preconcentration and Determination of Cu(II) from aqueous samples

“…On comparing the spectra, it was clear that in case of chelated Amberlite IR-120, new IR bands have appeared. These bands are at (N=O), 1348 cm -1 for (N-H) and δ(N-H), 1626 and 1383 cm -1 (C=O) and 1540 for N=N group [17]. Thus FTIR analysis indicated the successful chelation of Amberlite FTIR spectrum of modified Amberlite IR-120.…”

“…Different chelated polymer resins have been used for preconcentration of trace metals. Among these the most widely used are chelated Amberlite XAD-2 [8], XAD-7 [9], XAD-16 [10], XAD-2000 [11] and in addition activated alumina [12], and activated carbon [13] have also been used. Many chelating ligands such as quinolone, 2-amino-2-thiazoline, pyridine and aminophosphonate have been broadly used for chelating polymer resins [14].…”

On-line preconcentration of copper as its pyrocatechol violet complex on Chromosorb 105 for flame atomic absorption spectrometric determinations

“…The relative standard deviation [15,[39][40][41][42] and preconcentration factor [43][44][45][46][47][48][49] of analyte ions are superior to those of preconcentration technique for analyses. The proposed method shows very good sensitivity and precision and has some good advantages over other on-line preconcentration methods reported in the literature.…”