A Dy(III) ion-selective electrode based on 6-hydrazino-1,5-diphenyl-6,7-dihydropyrazolo[3,4-d]pyrimidine-4(5H)-imine (HDDPI) as an excellent sensing material was developed. The sensor exhibits a Nernstian behavior (a slope of 19.6 ± 0.3 mV per decade) over a wide concentration range (from 1.0 × 10-1 to 8.0 × 10-7 M Dy) with a detection limit of 4.2 × 10-7 M. The sensor response is independent of pH of the solution in the pH range 3.5-8.3. The sensor possesses the advantages of short conditioning time, fast response time (<10 s) and in particular, good selectivity and sensitivity to the dysprosium ion in the presence of a variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor also showed a great enhancement in selectivity coefficients for dysprosium ions, in comparison with the formerly mentioned dysprosium sensors. The electrode can be used for at least 10 weeks without any considerable divergence in the potentials. The proposed electrode was successfully used as an indicator electrode in potentiometric titration of Dy(III) ions with EDTA. The membrane sensor was also used in the determination of concentration of F- ions in some mouth washing solutions and in the Dy3+ recovery from solution.
基于6-
肼基-1,5
-二苯基-6,7-
二氢吡唑[3,4-d]
嘧啶-4(5H)-
亚胺(HDD
PI)作为优良的感受材料,开发了一种Dy(III)离子选择性电极。传感器在广泛浓度范围内(从1.0×10^-1到8.0×10^-7 M Dy)表现出Nernstian行为(每十年19.6±0.3 mV的斜率),检测限为4.2×10^-7 M。在pH 3.5-8.3的范围内,传感器响应不受溶液pH值的影响。该传感器具有短的调节时间,快速响应时间(<10 s)以及在存在各种阳离子(包括碱金属、碱土金属、过渡和重金属离子)的情况下对镝离子的良好选择性和灵敏度的优点。与以前的镝传感器相比,该传感器对镝离子的选择性系数也有很大的提高。该电极可以在至少10周内使用,电位没有明显的偏差。该电极成功地用作
EDTA滴定中Dy(III)离子的指示电极。膜传感器还用于测定一些漱口液中F-离子的浓度和Dy3+从溶液中的回收。