Kumar Krishnapillai Girish, Poduval Remalakshmy, Augustine Pearl, John Sareena, Saraswathyamma Beena
Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, India.
Anal Sci. 2006 Oct;22(10):1333-7. doi: 10.2116/analsci.22.1333.
A new PVC membrane ion selective electrode which is highly selective towards Ni(II) ions was constructed using a Schiff base containing a binaphthyl moiety as the ionophore. The sensor exhibited a good Nernstian response for nickel ions over the concentration range 1.0x10(-1)-5.0x10(-6) M with a lower limit of detection of 1.3x10(-6) M. It has a fast response time and can be used for a period of 4 months with a good reproducibility. The sensor is suitable for use in aqueous solutions in a wide pH range of 3.6-7.4 and works satisfactorily in the presence of 25% (v/v) methanol or ethanol. The sensor shows high selectivity to nickel ions over a wide variety of cations. It has been successfully used as an indicator electrode in the potentiometric titration of nickel ions against EDTA and also for the direct determination of nickel content in real samples: effluent samples, chocolates and hydrogenated oils.
使用含有联萘部分的席夫碱作为离子载体，构建了一种对镍（II）离子具有高选择性的新型聚氯乙烯膜离子选择性电极。该传感器在1.0×10（-1）-5.0×10（-6）M的浓度范围内对镍离子表现出良好的能斯特响应，检测下限为1.3×10（-6）M。它具有快速响应时间，可使用4个月，重现性良好。该传感器适用于pH范围为3.6-7.4的水溶液，在25%（v/v）甲醇或乙醇存在下能令人满意地工作。该传感器对多种阳离子中的镍离子具有高选择性。它已成功用作电位滴定法中镍离子与乙二胺四乙酸（EDTA）滴定的指示电极，也用于直接测定实际样品中的镍含量：废水样品、巧克力和氢化油。
