Bagheri Hasan, Afkhami Abbas, Khoshsafar Hosein, Rezaei Mosayeb, Sabounchei Seyed Javad, Sarlakifar Mehdi
Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
Anal Chim Acta. 2015 Apr 22;870:56-66. doi: 10.1016/j.aca.2015.03.004. Epub 2015 Mar 3.
In the present manuscript, an electrochemical sensor for the sensitive detection of Tl(+), Pb(2+) and Hg(2+) is described. A new composite electrode has been fabricated using graphene, 1-n-octylpyridinum hexafluorophosphate (OPFP), and [2,4-Cl2C6H3C(O)CHPPh3] (L), as a new synthetic phosphorus ylide. The physicochemical and electrochemical characterizations of fabricated sensor were investigated in details. The advantages of the proposed composite electrode are its ability in simultaneous electrochemical detection of Tl(+), Pb(2+) and Hg(2+) with good selectivity, stability and no need for separating of the three species from complex mixtures prior to electrochemical measurements. The analytical performance of the proposed electrode was examined using square wave voltammetry. Tl(+), Pb(2+) and Hg(2+) can be determined in linear ranges from 1.25×10(-9) to 2.00×10(-7) mol L(-1). Low detection limits of 3.57×10(-10) mol L(-1) for Tl(+), 4.50×10(-10) mol L(-1) for Pb(2+) and 3.86×10(-10) mol L(-1) for Hg(2+) were achieved. Finally, the proposed electrochemical sensor was applied to detect trace analyte ions in various water and soil samples with satisfactory results.
在本论文中，描述了一种用于灵敏检测Tl(+)、Pb(2+)和Hg(2+)的电化学传感器。使用石墨烯、1-正辛基吡啶六氟磷酸盐（OPFP）和[2,4-二氯苯基膦亚甲基三苯基膦]（L，一种新型合成磷叶立德）制备了一种新型复合电极。详细研究了所制备传感器的物理化学和电化学特性。所提出的复合电极的优点在于其能够同时对Tl(+)、Pb(2+)和Hg(2+)进行电化学检测，具有良好的选择性、稳定性，并且在电化学测量之前无需从复杂混合物中分离出这三种物质。使用方波伏安法检测了所提出电极的分析性能。Tl(+)、Pb(2+)和Hg(2+)的测定线性范围为1.25×10(-9)至2.00×10(-7) mol L(-1)。Tl(+)的检测限低至3.57×10(-10) mol L(-1)，Pb(2+)为4.50×10(-10) mol L(-1)，Hg(2+)为3.86×10(-10) mol L(-1)。最后，将所提出的电化学传感器应用于检测各种水和土壤样品中的痕量分析物离子，结果令人满意。
