Instituto de Química, Universidade Federal de Uberlândia, Uberlândia 38400-902, MG, Brazil.
Talanta. 2010 Jan 15;80(3):1133-8. doi: 10.1016/j.talanta.2009.08.040.
In this study a new method for determination of cadmium in alcohol fuel using Moringa oleifera seeds as a biosorbent in an on-line preconcentration system coupled to flame atomic absorption spectrometry (FAAS) was developed. Flow and chemical variables of the proposed system were optimized through multivariate designs. The limit of detection for cadmium was 5.50microg L(-1) and the precision was below 2.3% (35.0microg L(-1), n=9). The analytical curve was linear from 5 to 150microg L(-1), with a correlation coefficient of 0.9993. The developed method was successfully applied to spiked alcohol fuel, and accuracy was assessed through recovery tests, with recovery ranging from 97.50 to 100%.
本研究提出了一种新的方法，使用辣木种子作为生物吸附剂，在线预浓缩系统结合火焰原子吸收光谱法（FAAS）测定酒精燃料中的镉。通过多元设计优化了该系统的流动和化学变量。镉的检出限为 5.50μg L(-1)，精密度低于 2.3%（35.0μg L(-1)，n=9）。分析曲线在线性范围为 5 至 150μg L(-1)之间，相关系数为 0.9993。该方法成功应用于加标酒精燃料，通过回收试验评估了准确性，回收率在 97.50%至 100%之间。
