Gupta V K, Goyal R N, Al Khayat M, Kumar P, Bachheti N
Department of Chemistry, Indian Institute of Technology, Roorkee (UA), India.
Talanta. 2006 Jul 15;69(5):1149-55. doi: 10.1016/j.talanta.2005.12.040. Epub 2006 Jan 31.
Poly(vinyl chloride) (PVC) based membranes containing 4-tert-butylcalix[4]arene (I) as an electroactive material along with anion excluder sodiumtetraphenylborate (NaTPB) and plasticizer tri-butylphosphate (TBP) have been developed to fabricate a new zinc-selective sensor. Out of various compositions, the best performance was exhibited by the membrane having I, NaTPB, TBP and PVC in the ratio 8:5:100:200 (w/w). The sensor works well in the concentration range 9.8 x 10(-6) to 1.0 x 10(-1) mol dm(-3) with a near-Nernstian slope of 28.0+/-1.0 mV/decade of activity. The detection limit is down to 5.0 x 10(-7) mol dm(-3). The working pH range of this sensor is 2.5-4.3 and it works well in partially non-aqueous medium up to 15% (v/v) (methanol, ethanol and acetone). It exhibits a fast response time of 30s and could be used for more than four months without any considerable change in response characteristics. It has excellent selectivity for Zn(II) over other mono-, bi- and trivalent cations which have been reported to cause interference in the working of other sensors. It has been successfully used as an indicator electrode in the potentiometric titration of Zn(II) against EDTA and also to estimate zinc ions in industrial waste waters.
已开发出以聚氯乙烯（PVC）为基础的膜，其中含有4-叔丁基杯[4]芳烃（I）作为电活性材料，同时含有阴离子排除剂四苯硼酸钠（NaTPB）和增塑剂磷酸三丁酯（TBP），用于制造一种新型锌选择性传感器。在各种组成中，I、NaTPB、TBP和PVC比例为8:5:100:200（w/w）的膜表现出最佳性能。该传感器在9.8×10⁻⁶至1.0×10⁻¹mol dm⁻³的浓度范围内工作良好，具有近能斯特斜率28.0±1.0 mV/十倍活度。检测限低至5.0×10⁻⁷mol dm⁻³。该传感器的工作pH范围为2.5 - 4.3，在高达15%（v/v）（甲醇、乙醇和丙酮）的部分非水介质中也能良好工作。它表现出30秒的快速响应时间，并且可以使用四个多月而响应特性没有任何显著变化。它对Zn(II)具有优异的选择性，优于其他据报道会干扰其他传感器工作的单价、二价和三价阳离子。它已成功用作指示电极，用于Zn(II)对EDTA的电位滴定，还用于估计工业废水中的锌离子。
