Paul Anirban, Nair Ratish R, Chatterjee Pabitra B, Srivastava Divesh N
Analytical & Environmental Science Division and Centralized Instrument Facility, and Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Salt and Marine Chemicals Research Institute (CSMCRI), Gijubhai Badheka Marg, Bhavnagar 364002, Gujarat, India.
ACS Omega. 2018 Nov 29;3(11):16230-16237. doi: 10.1021/acsomega.8b02870. eCollection 2018 Nov 30.
A Cu(II)-selective electrode has been fabricated by utilizing a mechanochemically synthesized copper-specific ionophore "L" embedded in a poly(vinyl chloride) membrane. 2-Nitrophenyloctylether and sodium tetraphenylborate have been used as a plasticizer and as a solvent mediator, respectively, and found to be enhancing the sensitivity of the fabricated ion-selective electrode (ISE). A range of membranes (S1-S7) with varying compositions were casted and investigated in ISE. Results revealed an excellent Nernstian response of 29.38 ± 0.55 mV/dec for the ISE S6. The fabricated ISE operates well in the pH window 4.0-7.5, and the limit of detection was found to be 5 μM (0.3 ppm). Quick response time (15 s), long shelf-life, and selectivity (on the order of 10 and 10) over a number of interfering cations enabled S6 promising for real off laboratory sample analysis and can be employed to detect copper ion in various industrial as well as biological and environmental samples. To demonstrate the practical application of these ISE, the Cu concentration in the digested printed circuit board has been estimated using the standard calibration plot. The fabricated ISE has been regenerated through extracting copper by chelating with ethylenediaminetetraacetic acid.
通过利用机械化学合成的嵌入聚氯乙烯膜中的铜特异性离子载体“L”制备了一种铜(II)选择性电极。2-硝基苯基辛基醚和四苯硼酸钠分别用作增塑剂和溶剂介质,发现它们可提高所制备的离子选择性电极(ISE)的灵敏度。浇铸了一系列具有不同组成的膜(S1-S7)并在ISE中进行了研究。结果表明,ISE S6具有29.38±0.55 mV/dec的出色能斯特响应。所制备的ISE在pH 4.0-7.5范围内运行良好,检测限为5 μM(0.3 ppm)。快速响应时间(15秒)、长保质期以及对多种干扰阳离子的选择性(约为10和10)使S6有望用于实际实验室外样品分析,并可用于检测各种工业、生物和环境样品中的铜离子。为了证明这些ISE的实际应用,已使用标准校准曲线估算了消化后的印刷电路板中的铜浓度。所制备的ISE已通过与乙二胺四乙酸螯合萃取铜而再生。