Ozcan M, Akman S, Erbil C, Saraç S
Fen-Edebiyat Fakültesi, Kimya Bölümü, Istanbul Teknik Universitesi, 80626, Maslak, Istanbul, Turkey.
Anal Bioanal Chem. 1996 Jun;355(5-6):665-6. doi: 10.1007/s0021663550665.
A new chelating collector, polyacrylamide modified with nitrilo triacetic acid (NTA) was developed for the separation and preconcentration of copper, chromium, manganese, and zinc prior to their determination by Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The retention and recovery of the analyte elements were investigated by applying batch and column techniques. Cu(II), Cr(III), Mn(II) and Zn(II) were quantitatively retained by the collector at pH 5.5 or above. The chelating kinetics are so fast that in the batch procedure a quantitative separation of the analyte elements can be achieved in a few seconds. Since a very short contact time is enough to retain the analyte elements in column technique, a separation step can be completed quickly by applying fast flow rates in small columns. The elements collected were completely recovered with 2 mol/l of HCl. In the presence of sodium chloride up to 0.5% the analyte elements were quantitatively separated and recovered. Low blank values of the collector is another important advantage.
开发了一种新型螯合捕集剂，即经次氮基三乙酸（NTA）改性的聚丙烯酰胺，用于在通过石墨炉原子吸收光谱法（GFAAS）测定铜、铬、锰和锌之前对其进行分离和预富集。采用分批和柱技术研究了分析物元素的保留和回收率。在pH 5.5或更高时，捕集剂能定量保留Cu（II）、Cr（III）、Mn（II）和Zn（II）。螯合动力学非常快，以至于在分批程序中，几秒钟内就能实现分析物元素的定量分离。由于在柱技术中极短的接触时间就足以保留分析物元素，因此通过在小柱中采用快速流速可以快速完成分离步骤。收集到的元素用2 mol/L的HCl可完全回收。在存在高达0.5%的氯化钠的情况下，分析物元素能被定量分离和回收。捕集剂的空白值低是另一个重要优点。
