Gupta Vinod K, Prasad Rajendra, Kumar Azad
Department of Chemistry, I.I.T. Roorkee, Roorkee 247667, India.
Talanta. 2003 May 28;60(1):149-60. doi: 10.1016/S0039-9140(03)00118-8.
Copper(II) complex of ethambutol (I) was prepared and used in the fabrication of Cu(2+) selective ISE membrane. The membrane having Cu(II)-ethambutol complex (I) as electroactive material, along with sodium tetraphenylborate (NaTPB) as anion discriminator, dioctylphthalate (DOP) as plasticizer in poly(vinyl chloride) (PVC) matrix in the percentage ratio 6:2:190:200 (I:NaTPB:DOP:PVC) (w/w) gave a linear response in the concentration range 7.94x10(-6) to 1.0x10(-1) M of Cu(2+) with a slope of 29.9+/-0.2 mV per decade of activity and a fast response time of 11+/-2 s. The sensor works well in the pH range 2.1-6.3 and could be satisfactorily used in presence of 40% (v/v) methanol, ethanol and acetone and is selective for copper over a large number of cations with slight interference from Na(+) and Co(2+) if present at a level 1.5x10(-5) and 6.5x10(-5) M, respectively. It works well over a period of 6 months and can also be used as indicator electrode for the end point determination in the potentiometric titration of Cu(2+) against EDTA as well as in the determination of Cu(2+) in real samples.
制备了乙胺丁醇（I）的铜（II）配合物，并将其用于制备铜（2+）选择性离子选择电极（ISE）膜。该膜以铜（II）-乙胺丁醇配合物（I）作为电活性材料，四苯硼酸钠（NaTPB）作为阴离子识别剂，邻苯二甲酸二辛酯（DOP）作为增塑剂，以6:2:190:200（I:NaTPB:DOP:PVC）（w/w）的比例存在于聚氯乙烯（PVC）基质中，在7.94×10（-6）至1.0×10（-1）M的铜（2+）浓度范围内呈现线性响应，每十倍活性变化的斜率为29.9±0.2 mV，响应时间快速，为11±2 s。该传感器在pH范围2.1 - 6.3内工作良好，在40%（v/v）的甲醇、乙醇和丙酮存在下也能令人满意地使用，对铜具有选择性，对大量阳离子有选择性，若存在1.5×10（-5）M的Na（+）和6.5×10（-5）M的Co（2+）会有轻微干扰。它在6个月内工作良好，还可作为指示电极用于铜（2+）与乙二胺四乙酸（EDTA）电位滴定的终点测定以及实际样品中铜（2+）的测定。
