Suah Faiz Bukhari Mohd, Ahmad Musa
School of Chemical Sciences, Universiti Sains Malaysia, 11800, Minden, Pulau Pinang, Malaysia.
Faculty of Science & Technology, Universiti Sains Islam Malaysia, 71800, Bandar Baru Nilai, Negeri Sembilan, Malaysia.
Anal Chim Acta. 2017 Jan 25;951:133-139. doi: 10.1016/j.aca.2016.11.040. Epub 2016 Nov 25.
The use of a polymer inclusion membrane (PIM) as a sensing material is a new approach to overcome the selectivity and stability drawbacks of the optical chemical sensor (optode). In this study, non-plasticized PIM containing poly(vinyl chloride) as a support base, sodium morin-5-sulfonate (NaMSA) as a reagent and Aliquat 336 as a fixed carrier (ionophore) was prepared and its performance was tested for application in an optode to determine Al ions. The results showed that PIM properties are greatly influenced by the membrane composition. The studies revealed that the optode response was dependent on film thickness, the presence of plasticizer, stirring effect, concentration of NaMSA, concentration of Aliquat 336 and pH of the aqueous solution used. The dynamic range of Al ions concentration determined using this optode was linear from 5.19 × 10 to 6.00 × 10 mol L and the calculated limit of detection (L.O.D.) was found to be 4.07 × 10 mol L. The maximum emission wavelength (λ) for the PIM based optode was 512 nm. Scanning electron microscopy analysis of the PIM revealed that a dense texture was formed. Fourier transform infra-red and thermal gravimetry analysis characterizations proved that all of the constituents of the PIM remain within the membrane. The PIM developed in this work was found to be stable, has good mechanical strength, and is sensitive and reusable. Lastly, the PIM was successfully applied as an optical sensor for determination of Al ions in an aqueous solution.
使用聚合物包容膜（PIM）作为传感材料是克服光学化学传感器（光极）选择性和稳定性缺点的一种新方法。在本研究中，制备了以聚氯乙烯为支撑基质、桑色素-5-磺酸钠（NaMSA）为试剂、Aliquat 336为固定载体（离子载体）的非增塑PIM，并测试了其在光极中用于测定铝离子的性能。结果表明，PIM的性能受膜组成的影响很大。研究表明，光极响应取决于膜厚度、增塑剂的存在、搅拌效果、NaMSA浓度、Aliquat 336浓度以及所用水溶液的pH值。使用该光极测定铝离子浓度的动态范围在5.19×10至6.00×10 mol/L之间呈线性，计算得出的检测限（L.O.D.）为4.07×10 mol/L。基于PIM的光极的最大发射波长（λ）为512 nm。对PIM的扫描电子显微镜分析表明形成了致密的纹理。傅里叶变换红外光谱和热重分析表征证明PIM的所有成分都保留在膜内。在这项工作中开发的PIM被发现是稳定的，具有良好的机械强度，并且灵敏且可重复使用。最后，PIM成功地用作测定水溶液中铝离子的光学传感器。
