Ganjali Mohammad Reza, Mizani Farhang, Salavati-Niasari Masoud, Javanbakht Mehran
Department of Chemistry, Faculty of Science, Tehran University, Tehran, Iran.
Anal Sci. 2003 Feb;19(2):235-8. doi: 10.2116/analsci.19.235.
A plasticized Cr3+ ion sensor by incorporating 2,3,8,9-tetraphenyl-1,4,7,10-tetraazacyclododeca-1,3,7,9-tetraene (TTCT) ionophore exhibits a good potentiometric response for Cr3+ over a wide concentration range (1.0 x 10(-6)-1.0 x 10(-1) M) with a slope of 19.5 mV per decade. The sensor response is stable for at least three months. Good selectivity for Cr3+ in comparison with alkali, alkaline earth, transition and heavy metal ions, and minimal interference are caused by Li+, Na+, K+, Co2+, Hg2+, Ca2+, Pb2+ and Zn2+ ions, which are known to interfere with other chromium membrane sensors. The TTCT-based electrode shows a fast response time (15 s), and can be used in aqueous solutions of pH 3-5.5. The proposed sensor was used for the potentiometric titration of Cr3+ with EDTA and for a direct potentiometric determination of Cr3+ content in environmental samples.
通过掺入2,3,8,9-四苯基-1,4,7,10-四氮杂环十二烷-1,3,7,9-四烯（TTCT）离子载体的增塑Cr3+离子传感器，在1.0×10(-6)-1.0×10(-1)M的宽浓度范围内对Cr3+表现出良好的电位响应，斜率为每十倍浓度变化19.5mV。该传感器响应至少三个月稳定。与碱金属、碱土金属、过渡金属和重金属离子相比，对Cr3+具有良好的选择性，Li+、Na+、K+、Co2+、Hg2+、Ca2+、Pb2+和Zn2+离子引起的干扰最小，而这些离子已知会干扰其他铬膜传感器。基于TTCT的电极响应时间快（15秒），可用于pH值为3-5.5的水溶液中。所提出的传感器用于用EDTA对Cr3+进行电位滴定以及直接电位法测定环境样品中的Cr3+含量。
