Malla Mónica E, Alvarez Mónica B, Batistoni Daniel A
Department of Chemistry and Chemical Engineering, Universidad Nacional del Sur, (8000) Bahia Blanca, Provincia de Buenos Aires, Argentina.
Talanta. 2002 May 16;57(2):277-87. doi: 10.1016/s0039-9140(02)00034-6.
A chelating type ion exchange resin (Amberlite IRC-718), containing iminodiacetate groups as active sites, has been characterized regarding the sorption and subsequent elution of Cd, Zn and Pb, aiming to metal preconcentration from solution samples of different origins. The methodology developed is based on off-line operation employing mini columns made of the sorbent. The eluted metals were determined by flame atomic absorption spectrometry. The effect of column conditioning, influent pH and flow rate during the sorption step, and the nature of the acid medium employed for desorption of the retained metals were investigated. Working (breakthrough) and total capacities were measured under dynamic operating conditions and the results compared with those obtained with Chelex-100, a resin extensively employed for analytical preconcentration. Structural information on the complexation of metals by the chelating groups was obtained by Fourier Transform infrared spectrometry. The analytical response of the Amberlite sorbent was assessed for the analysis of water samples and digestates of marine sediments.
一种含有亚氨基二乙酸基团作为活性位点的螯合型离子交换树脂（Amberlite IRC - 718），已针对镉、锌和铅的吸附及后续洗脱进行了表征，旨在从不同来源的溶液样品中预富集金属。所开发的方法基于使用由吸附剂制成的微型柱的离线操作。通过火焰原子吸收光谱法测定洗脱的金属。研究了柱调节、吸附步骤中的进水pH值和流速以及用于解吸保留金属的酸性介质的性质。在动态操作条件下测量了工作（穿透）容量和总容量，并将结果与广泛用于分析预富集的树脂Chelex - 100所获得的结果进行了比较。通过傅里叶变换红外光谱法获得了有关螯合基团对金属络合作用的结构信息。评估了Amberlite吸附剂对水样和海洋沉积物消化物分析的分析响应。
