Department of Chemistry, Art and Science Faculty, Middle East Technical University, 06531 Ankara, Turkey.
Talanta. 2011 Sep 30;85(4):1786-91. doi: 10.1016/j.talanta.2011.07.006. Epub 2011 Jul 12.
Sensitivity enhancement of indium determination by flame atomic absorption spectrometry (FAAS) was achieved; using a slotted quartz tube (SQT-FAAS) and slotted quartz tube atom trap (SQT-AT-FAAS). SQT was used as an atom trap (AT) where the analyte is accumulated in its inner wall prior to re-atomization. The signal is formed after re-atomization of analyte on the trap surface by introduction of 10 μL of isobutyl methyl ketone (IBMK). Sensitivity was improved 400 times using SQT-AT-FAAS system with respect to conventional FAAS and 279 times with respect to SQT-FAAS without any collection. Characteristic concentration (C(0)) and limit of detection values were found to be 3.63 ng mL(-1) and 2.60 ng mL(-1), respectively, using a sample flow rate of 7.0 mL min(-1) and a collection period of 5.0 min. In addition, interference effects of some elements on indium signal were studied. In order to characterize indium species trapped, X-ray Photoelectron Spectrometry (XPS) was utilized and it was found that indium was collected on the inner surface of SQT as In(2)O(3). The accuracy of the procedure was checked to determine indium in the standard reference material (Montana Soil, SRM 2710).
通过火焰原子吸收光谱法（FAAS）实现了铟测定的灵敏度增强；使用了开槽石英管（SQT-FAAS）和开槽石英管原子阱（SQT-AT-FAAS）。SQT 被用作原子阱（AT），在重新原子化之前，分析物在其内壁上积累。通过引入 10 μL 的异丁基甲基酮（IBMK），在阱表面重新原子化分析物后形成信号。与传统 FAAS 相比，使用 SQT-AT-FAAS 系统可将灵敏度提高 400 倍，与没有收集的 SQT-FAAS 相比可提高 279 倍。使用 7.0 mL min(-1) 的样品流速和 5.0 min 的收集周期，发现特征浓度（C(0)）和检测限分别为 3.63 ng mL(-1) 和 2.60 ng mL(-1)。此外，还研究了一些元素对铟信号的干扰影响。为了表征捕获的铟物种，利用 X 射线光电子能谱（XPS）进行了研究，发现铟作为 In(2)O(3) 被收集在 SQT 的内表面上。为了确定标准参考物质（蒙大拿土壤，SRM 2710）中的铟，检查了该程序的准确性。
