Abstract
A new chelating sorbent has been synthesized using Amberlite XAD-2 resin functionalized with 1-amino-2-naphthol-4-sulfonic acid (ANSA) through –N=N– group. This sorbent, characterized by infrared (FTIR) spectra and optimized for sorption-desorption of the studied metal ions then, it was used as packing for the column for separation/ preconcentration of cadmium, cobalt, and nickel prior to their determination spectrophotometrically. Metal ions of Cd, Ni, and Co sorbed in the column were eluted one by one with 0.02 M, 0.10 M, and 0.20 M HCl acid respectively. Under the optimal conditions, the proposed procedure enabled the determination of Cd, Co, and Ni with detection limits of 0.98, 0.30 and 2.10 μg L− 1 respectively. The developed procedure was evaluated by the analysis of mixed metal ions Cd, Co and Ni solution contained 0.30, 30, and 1.25 µg respectively, and the percentage recovery was 95.5 – 104%. The procedure was applied to the analysis of food samples (grains of Sorghum bicolor), and the results obtained were compared with that of FAAS (before and after separation/preconcentration).
Highlights
Different heavy metals of different samples have been determined, after different preconcentration systems, using different analytical instruments
Cadmium has been determined in river water using visible spectrophotometer (Vis-S) after solid phase extraction [1]; Cadmium and Copper have been determined using FAAS after solid phase extraction [2]; Cobalt using Vis-S after solid phase extraction [3]; Nickel using Vis-S after solid phase extraction [4]; cobalt, copper, and nickel using FAAS after solid phase extraction [5]; lead, Cadmium, Nickel, and Cobalt using ICP-AES and ICP-MS after solid phase extraction [6]
IR spectra, from Table 1, demonstrate metal ions retention on chelating resin12 (ChR12)
Summary
Different heavy metals of different samples have been determined, after different preconcentration systems, using different analytical instruments. Synthesis of amberlite resin for the determination of trace elements in food samples preconcentration step, this carried out by reducing the volume of eluate, by evaporation, before measuring using FAAS [7, 8]. Such this additional step is likely to contribute to loss or contamination and to increase in analysis time and chemicals to be used. Solid phase extraction has advantages over the other widely technique used for separation/ preconcentration of heavy metals traces These advantages include simplicity, high enrichment factor, regeneration easiness, and significant reducing the disposal costs and extraction time [21]. Amberlite XAD-2 resin has been functionalized with others ligands as 4, 5-dihydroxy-1, 3-benzenedisulfonic acid through –CH2 group [32], o-aminophenol through –N=N– group [33], pyrocatecholviolt through –N=N– group [34]
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