Singh Ashok Kumar, Saxena Puja, Mehtab Sameena, Panwar Amit
Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee, 247 667, India.
Anal Bioanal Chem. 2006 Aug;385(7):1342-6. doi: 10.1007/s00216-006-0544-9. Epub 2006 Jun 23.
A new poly(vinyl chloride)-based membrane was fabricated with the cobalt(II) complex of 2,4-dimethyl-1,5,8,11-tetraazacyclotrideca-1,4-diene [Me2(13)dieneN4] as an ion carrier. The membrane composition was Co2+ complex/PVC/NaTPB/DBP 15:50:15:20 (w/w). The sensor exhibited a Nernstian response for Co2+ ions over a wide concentration range (7.94x10(-6)-1.0x10(-1) M) at pH 2.5-7.0, a response time of 10 s, and it could be used for 3 months without any significant divergence in potential. The proposed membrane sensor exhibited good selectivity for Co2+ over a wide variety of other metal ions and in mixtures containing up to 25% (v/v) non-aqueous content. The sensor was successfully used as an indicator electrode in the potentiometric titration of Co2+ with EDTA and the direct determination of Co2+ in real samples.
以2,4-二甲基-1,5,8,11-四氮杂环十三碳-1,4-二烯[Me2(13)dieneN4]的钴(II)配合物为离子载体，制备了一种新型聚氯乙烯基膜。膜的组成是Co2+配合物/聚氯乙烯/四苯硼钠/邻苯二甲酸二丁酯15:50:15:20（重量/重量）。该传感器在pH 2.5至7.0的宽浓度范围（7.94×10(-6)-1.0×10(-1) M）内对Co2+离子呈现能斯特响应，响应时间为10秒，并且可以使用3个月而电位无任何显著偏差。所提出的膜传感器在多种其他金属离子以及含有高达25%（体积/体积）非水成分的混合物中对Co2+表现出良好的选择性。该传感器成功用作以EDTA电位滴定Co2+以及直接测定实际样品中Co2+的指示电极。
