Abstract

A novel preconcentration methodology to enhance the sensitivity of a flame atomic absorption spectrometer for indium determination was investigated in this study. The proposed methodology is based on the application of switchable solvent based liquid-phase microextraction combined with a slotted quartz tube. The isolation of indium was performed using N, N-dimethylbenzylamine as the extraction solvent after complexation with (E)-2,4-dibromo-6-(((3-hydroxyphenyl)imino)methyl)phenol. The detection power was enhanced by approximately 169-fold using the developed method with respect to the conventional flame atomic absorption spectrometry system. The quantification and detection limit values were 28.3 and 8.4 ng mL⁻¹, respectively. The assessment of several interfering ions on the analyte was performed, and spike experiments were used to validate the method’s accuracy. Interferences were observed for a ratio of 1:10 analyte:interferent with a value of 27%. The recovery results obtained using matrix matching strategy indicated the applicability of the developed method for soil matrices.

摘要

在这项研究中，研究了一种新的预浓缩方法，以提高火焰原子吸收光谱仪测定铟的灵敏度。所提出的方法是基于可切换溶剂的液相微萃取结合缝隙石英管的应用。在与（E）-2，4-二溴-6-（（（3-羟基苯基）亚氨基）甲基）苯酚络合后，使用N，N-二甲基苄胺作为萃取溶剂进行铟的分离。使用开发的方法相对于常规火焰原子吸收光谱系统，检测能力提高了约169倍。定量和检测极限值为28.3和8.4 ng mL ^-1， 分别。对分析物上的几种干扰离子进行了评估，并使用加标实验验证了该方法的准确性。观察到干扰物与干扰物的比例为1:10，干扰物的值为27％。使用基质匹配策略获得的回收率结果表明，该方法适用于土壤基质。