Chen Yun-Chieh, Jian Yu-Ling, Chiu Kong-Hwa, Yak Hwa-Kwang
Green Chemistry Lab, Department of Chemistry, Chung Yuan Christian University, Taiwan, ROC.
Anal Sci. 2012;28(8):795-9. doi: 10.2116/analsci.28.795.
This study reports on a method for the speciation of iron in aqueous samples by the simultaneous analysis of divalent and trivalent iron ions with ion chromatography equipped with chemiluminescence detection (IC-CLD). Ferrous and ferric ions are first chelated by pyridine-2,6-dicarboxylic acid (PDCA) to form complexed anions, and separated by a mixed-bed ion-exchange column. The separated complexed ions are then detected with a CLD system containing luminol and hydrogen peroxide in a basic solution. This luminescence system has a linear dynamic range of ca. 3 orders of magnitude, with method detection limits as low as 7 µg L(-1) for Fe(II) and 3 µg L(-1) for Fe(III), measured in the simultaneous detection mode. This system resists interferences from common cations such as Cd, Ca, Cr, Cu, Mg, Ni, Pb, and Zn. Evaluation by analyzing real samples shows that this method is rapid, accurate, sensitive, and selective.
本研究报道了一种通过配备化学发光检测（IC-CLD）的离子色谱同时分析二价铁离子和三价铁离子来对水样中的铁进行形态分析的方法。亚铁离子和铁离子首先被吡啶-2,6-二羧酸（PDCA）螯合形成络合阴离子，然后通过混合床离子交换柱进行分离。分离出的络合离子随后用含有鲁米诺和过氧化氢的碱性溶液CLD系统进行检测。该发光系统的线性动态范围约为3个数量级，在同时检测模式下，铁（II）的方法检测限低至7μg L(-1)，铁（III）的方法检测限低至3μg L(-1)。该系统可抵抗常见阳离子如镉、钙、铬、铜、镁、镍、铅和锌的干扰。通过分析实际样品进行评估表明，该方法快速、准确、灵敏且具有选择性。
