Kormalı Ertürün H Elif, Demirel Özel Ayça, Sayın Serkan, Yılmaz Mustafa, Kılıç Esma
Department of Chemistry, Faculty of Science, Ankara University, Tandoğan, 06100 Ankara, Turkey.
Department of Chemistry, Faculty of Science, Ankara University, Tandoğan, 06100 Ankara, Turkey.
Talanta. 2015 Jan;132:669-75. doi: 10.1016/j.talanta.2014.10.032. Epub 2014 Oct 22.
A new pH sensing poly(vinyl chloride) (PVC) membrane electrode was developed by using recently synthesized 5,17-bis(4-benzylpiperidine-1-yl)methyl-25,26,27,28-tetrahydroxy calix[4]arene as an ionophore. The effects of membrane composition, inner filling solution and conditioning solution on the potential response of the proposed pH sensing membrane electrode were investigated. An optimum membrane composition of 3% ionophore, 67% o-nitrophenyl octyl ether (o-NPOE) as plasticizer, 30% PVC was found. The electrode exhibited a near-Nernstian slope of 58.7±1.1 mV pH(-1) in the pH range 1.9-12.7 at 20±1 °C. It showed good selectivity for H(+) ions in the presence of some cations and anions and a longer lifetime of at least 12 months when compared with the other PVC membrane pH electrodes reported in the literature. Having a wide working pH range, it was not only applied as a potentiometric indicator electrode in various acid-base titrations, but also successfully employed in different real samples. It has good reproducibility and repeatability with a response time of 6-7s. Compared to traditional glass pH electrode, it exhibited excellent potentiometric response after being used in fluoride-containing media.
通过使用最近合成的5,17-双（4-苄基哌啶-1-基）甲基-25,26,27,28-四羟基杯[4]芳烃作为离子载体，开发了一种新型pH传感聚氯乙烯（PVC）膜电极。研究了膜组成、内充溶液和调节溶液对所提出的pH传感膜电极电位响应的影响。发现最佳膜组成为3%离子载体、67%邻硝基苯基辛基醚（o-NPOE）作为增塑剂、30%PVC。在20±1°C下，该电极在1.9-12.7的pH范围内表现出58.7±1.1 mV pH⁻¹的近能斯特斜率。在一些阳离子和阴离子存在的情况下，它对H⁺离子表现出良好的选择性，并且与文献中报道的其他PVC膜pH电极相比，具有至少12个月的更长使用寿命。由于具有较宽的工作pH范围，它不仅被用作各种酸碱滴定中的电位指示电极，还成功应用于不同的实际样品中。它具有良好的重现性和重复性，响应时间为6-7秒。与传统玻璃pH电极相比，它在含氟介质中使用后表现出优异的电位响应。
