Jain A K, Gupta V K, Singh L P, Srivastava P, Raisoni J R
Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, India.
Talanta. 2005 Feb 15;65(3):716-21. doi: 10.1016/j.talanta.2004.07.041.
Novel ionophore, C-thiophenecalix[4]resorcinarene (I) has been synthesized and characterized by IR, NMR and C, H, N analysis. Poly(vinyl chloride) (PVC) based membranes of ionophore (I) using dibutylphthalate (DBP), dioctylphthalate (DOP), 1-chloronapthalene (CN), tris(2-ethylhexyl) phosphate (TEHP) and bis(2-ethylhexyl)sebacate (DOS) as plasticizing solvent mediators were prepared and used as CrO(4)(2-) selective sensors. Of the various sensors prepared, the one with membrane composition 2:66:120mg (I: PVC: DBP) exhibited the best performance. This sensor works well over a wide concentration range 5.6 x 10(-6)-1.0 x 10(-1)M (detection limit approximately 0.30ppm) with Nernstian compliance (29.0mV per decade) between pH 6.5-10.0 with a fast response time of approximately 13s. The selectivity coefficient values as determined by fixed interference method (FIM) indicate excellent selectivity for CrO(4)(2-) ions over a large number of anions. The sensor exhibits adequate shelf-life ( approximately 5 months) with good reproducibility (S.D. +/- 0.2mV). The sensor has been used in the potentiometric titration of chromate with Pb(II). Determination of chromium in electroplating waste using the sensor was successfully achieved.
新型离子载体C-噻吩杯[4]间苯二酚芳烃（I）已被合成，并通过红外光谱、核磁共振以及碳、氢、氮分析进行了表征。以聚氯乙烯（PVC）为基础，使用邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二辛酯（DOP）、1-氯萘（CN）、磷酸三（2-乙基己基）酯（TEHP）和癸二酸双（2-乙基己基）酯（DOS）作为增塑溶剂介质，制备了离子载体（I）的膜，并用作CrO(4)(2-)选择性传感器。在所制备的各种传感器中，膜组成比例为2:66:120mg（I:PVC:DBP）的传感器表现出最佳性能。该传感器在5.6×10(-6)-1.0×10(-1)M的宽浓度范围内（检测限约为0.30ppm）性能良好，在pH 6.5-10.0之间符合能斯特响应（每十倍浓度变化29.0mV），响应时间约为13秒。通过固定干扰法（FIM）测定的选择性系数值表明，该传感器对CrO(4)(2-)离子相对于大量阴离子具有优异的选择性。该传感器具有足够的保质期（约5个月），重现性良好（标准偏差±0.2mV）。该传感器已用于用Pb(II)对铬酸盐进行电位滴定。使用该传感器成功实现了电镀废水中铬的测定。
