Behbahani Ali, Ardjmand Mehdi
Islamic Azad University, Department of Chemical Engineering, South Tehran Branch, Tehran, Iran.
J AOAC Int. 2015 Sep-Oct;98(5):1417-22. doi: 10.5740/jaoacint.14-204.
A new method was applied to produce modified nanoporous silica as a novel sorbent for Pb(II) ion SPE from industrial wastewater samples. In this modified method, the produced nanoporous silica has a higher functional group loading, which leads to a higher preconcentration factor as well as a lower LOD. This modified nanoporous silica was used for preconcentration prior to subsequent determination of Pb(II) ions by flame atomic absorption spectrometry. Various parameters such as the eluent, pH of the sample solution, and flow rate were optimized during this work. Also, the effect of a variety of ions on preconcentration and recovery of Pb(II) ions was investigated. The LOD, defined as five times the SD of the blank, was determined to be lower than 0.1 mg/L with an RSD of <2%. The accuracy of the method was established by analyzing standard reference materials with certified Pb concentrations. Finally, the established method was successfully applied for determination of the Pb(II) ion concentration in industrial wastewater samples.
一种新方法被用于制备改性纳米多孔二氧化硅，作为从工业废水样品中固相萃取铅（II）离子的新型吸附剂。在这种改性方法中，所制备的纳米多孔二氧化硅具有更高的官能团负载量，这导致更高的预富集因子以及更低的检测限。这种改性纳米多孔二氧化硅用于在通过火焰原子吸收光谱法后续测定铅（II）离子之前进行预富集。在这项工作中，对各种参数如洗脱剂、样品溶液的pH值和流速进行了优化。此外，还研究了各种离子对铅（II）离子预富集和回收率的影响。检测限定义为空白标准偏差的五倍，测定结果低于0.1 mg/L，相对标准偏差<2%。通过分析具有认证铅浓度的标准参考物质确定了该方法的准确性。最后，所建立的方法成功应用于测定工业废水样品中的铅（II）离子浓度。
