Synthesis of amberlite XAD-2-ANSA resin for separation, preconcentration and spectrophotometric determination of trace elements in food samples

Archives of Pharmaceutical Sciences Ain Shams University Pub Date : 2018-06-01 DOI:10.21608/aps.2018.18741

Mohamed M. Taher

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Abstract

A new chelating sorbent has been synthesized using Amberlite XAD-2 resin functionalized with 1-amino2-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).

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安贝岩XAD-2-ANSA树脂的合成及其分离、富集和分光光度法测定食品样品中微量元素

以Amberlite XAD-2树脂为原料，通过- N=N -基团以1-氨基-2 -萘酚-4-磺酸(ANSA)为官能团，合成了一种新型螯合吸附剂。该吸附剂对所研究的金属离子进行了红外光谱表征，并对所研究的金属离子的吸附-解吸进行了优化，然后将其用作色谱柱的填料，用于分光光度法测定镉、钴和镍的分离/预富集。柱上吸附的金属离子Cd、Ni、Co分别用0.02 M、0.10 M、0.20 M盐酸逐一洗脱。在最佳条件下，Cd、Co和Ni的检出限分别为0.98、0.30和2.10 μg L−1。对Cd、Co、Ni三种金属离子浓度分别为0.30、30、1.25 μg的混合溶液进行分析，回收率为95.5% ~ 104%。将该方法应用于食品样品(双色高粱籽粒)的分析，并与分离/富集前后的火焰原子吸收光谱分析结果进行了比较。

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Archives of Pharmaceutical Sciences Ain Shams University

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12 weeks