Department of Chemistry, Faculty of Science, Guilan University, PO Box 41335, 19141 Rasht, Iran.
J Hazard Mater. 2010 Feb 15;174(1-3):788-94. doi: 10.1016/j.jhazmat.2009.09.121. Epub 2009 Sep 30.
The high tendency of 5-nitropiazselenol for self-accumulation on thin mercury film electrode was used innovatively for determination of Se(IV) in natural waters. 5-Nitropiazselenol was formed by reaction between Se(IV) and 4-nitro-1,2-phenylenediamine in acidic solution and self-accumulation process was carried out directly from reaction media. The adsorbed 5-nitropiazselenol was stripped in HCl solution by DP cathodic potential scan. All parameters influencing the measurement were optimized and evaluated. Detection limit of this method is 0.06 ng mL(-1). Interferences of various cations and anions were studied. The adsorption tendency of some other piazselenols made by some aromatic ortho-diamines was also investigated. The problems arising from applying potential during accumulation process in natural waters analysis were discussed. This method was applied for determination of Se(IV) in natural waters collected from some internationally registrated lagoons south of Caspian Sea. The obtained results were compared with the results of ICP-AES and DPCSV after electrochemical preconcentration.
5-硝基苯并硒唑啉在汞膜电极上的高自积累倾向被创新性地用于测定天然水中的硒(IV)。5-硝基苯并硒唑啉是由硒(IV)与 4-硝基-1,2-苯二胺在酸性溶液中反应形成的，自积累过程可以直接从反应介质中进行。吸附的 5-硝基苯并硒唑啉在 HCl 溶液中通过 DP 阴极电位扫描进行剥离。优化和评估了影响测量的所有参数。该方法的检测限为 0.06ngmL(-1)。研究了各种阳离子和阴离子的干扰。还研究了一些由芳香邻二胺制成的其他苯并硒唑啉的吸附倾向。讨论了在自然水分析中在积累过程中应用电位时出现的问题。该方法用于测定从里海以南一些国际注册泻湖采集的天然水中的硒(IV)。电化学预浓缩后，将所得结果与 ICP-AES 和 DPCSV 的结果进行了比较。
