Rezayi Majid, Karazhian Reza, Abdollahi Yadollah, Narimani Leila, Sany Seyedeh Belin Tavakoly, Ahmadzadeh Saeid, Alias Yatimah
1] Chemistry Department, Faculty of Science, University Malaya, 50603 Kuala Lumpur, Malaysia [2] Food Quality and Safety Research Department, Food Science and Technology Research Institute, ACECR Mashhad Branch, 91775-1376 Mashhad, Iran.
Food Quality and Safety Research Department, Food Science and Technology Research Institute, ACECR Mashhad Branch, 91775-1376 Mashhad, Iran.
Sci Rep. 2014 Apr 11;4:4664. doi: 10.1038/srep04664.
The introduction of low detection limit ion selective electrodes (ISEs) may well pave the way for the determination of trace targets of cationic compounds. This research focuses on the detection of titanium (III) cation using a new PVC-membrane sensor based on synthesized tris(2pyridyl) methylamine (tpm) ionophore. The application and validation of the proposed sensor was done using potentiometric titration, inductively coupled plasma atomic emission spectrometry (ICP-AES), and atomic absorption spectrometry (AAS). The membrane sensor exhibited a Nernstian response to the titanium (III) cation over a concentration range of 1.0 × 10(-6)-1.0 × 10(-2) M and pH range from 1-2.5. The Nernstian slope, the lower of detection (LOD), and the response time (t95%) of the proposed sensor were 29.17 ± 0.24 mV/dec, 7.9 × 10-7 M, and 20 s, respectively. The direct determination of 4-39 μg/ml of titanium (III) standard solution showed an average recovery of 94.60 and a mean relative standard deviation of 1.8 at 100.0 μg/ml. Finally, the utilization of the electrodes as end-point indicators for potentiometric titration with EDTA solutions for titanium (III) sensor was successfully carried out.
低检测限离子选择性电极（ISEs）的引入很可能为阳离子化合物痕量目标物的测定铺平道路。本研究聚焦于使用基于合成的三（2 - 吡啶基）甲胺（tpm）离子载体的新型PVC膜传感器检测钛（III）阳离子。所提出传感器的应用和验证通过电位滴定、电感耦合等离子体原子发射光谱法（ICP - AES）和原子吸收光谱法（AAS）完成。该膜传感器在1.0×10⁻⁶ - 1.0×10⁻² M的浓度范围和1 - 2.5的pH范围内对钛（III）阳离子呈现能斯特响应。所提出传感器的能斯特斜率、检测下限（LOD）和响应时间（t95%）分别为29.17±0.24 mV/dec、7.9×10⁻⁷ M和20 s。对4 - 39 μg/ml的钛（III）标准溶液进行直接测定，在100.0 μg/ml时平均回收率为94.60，平均相对标准偏差为1.8。最后，成功地将该电极用作钛（III）传感器用EDTA溶液进行电位滴定时的终点指示剂。
