RETRACTED: Determination of Co(II) in water and soil samples using spectrophotometry coupled with preconcentration on 4-amino methyl pyridine anchored silica gel column

Preconcentration and determination of trace metal ions from aqueous samples by newly developed gallic acid modified Amberlite XAD-16 chelating resin

“…Various solid phases including chelex 100 [18], silica gel [19,20], Amberlite XAD resins [21][22][23][24][25][26], polyurethane foam [27], and activated carbon [28] have been used for the solid-phase extraction of traces heavy metals in environmental samples prior to their instrumental analysis.…”

Three modified activated carbons by different ligands for the solid phase extraction of copper and lead

“…The selectivity of the modified solid phases toward certain metal ions is attributed to several well known factors such as the size of the organic modifier [8], the activity of the loaded surface groups [9,10], the type of the interacting donor atom and metal ion and the reported well known phenomenon of hard-soft acid-bases [11]. The reasons for widespread application of the activated carbon as a trace collector for metal ion preconcentration [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] are strong interaction and quantitative adsorption of molecules with electrons on activated carbon.…”

Solid-phase extraction of Mn(II), Co(II), Ni(II), Cu(II), Cd(II) and Pb(II) ions from environmental samples by flame atomic absorption spectrometry (FAAS)

“…SPE is also superior for preconcentration of trace metals in respect to minimum solvent waste generation and sorption of the target species on the solid surface in a more stable chemical form [20][21][22]. Various solid phases including chelex 100 [23], silica gel [24,25], Amberlite XAD resins [26][27][28][29][30][31], polyurethane foam [32], and activated carbon [33] have been used for the solid-phase extraction of traces heavy metals in environmental samples prior to their instrumental analysis.…”