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Abstract：
This paper presents the development of cheap and selective Paper-based Analytical Devices (PADs) for selective Pd(II) determination from very acidic aqueous solutions. The PADs were obtained by impregnating two cm-side squares of filter paper with an azoic ligand, (2-(tetrazolylazo)-1,8 dihydroxy naphthalene-3,6,-disulphonic acid), termed TazoC. The so-obtained orange TazoC-PADs interact quickly with Pd(II) in aqueous solutions by forming a complex purple-blue-colored already at pH lower than 2. The dye complexes no other metal ions at such an acidic media, making TazoC-PADs highly selective to Pd(II) detection. Besides, at higher pH values, other cations, for example, Cu(II) and Ni(II), can interact with TazoC through the formation of stable and pink-magenta-colored complexes; however, it is possible to quantify Pd(II) in the presence of other cations using a multivariate approach. To this end, UV-vis spectra of the TazoC-PADs after equilibration with the metal ions solutions were registered in the 300-800 nm wavelength range. By applying Partial Least Square regression (PLS), the whole UV-vis spectra of the TazoC-PADs were related to the Pd(II) concentrations both when present alone in solution and also in the presence of Cu(II) and Ni(II). Tailored PLS models obtained with matrix-matched standard solutions correctly predicted Pd(II) concentrations in unknown samples and tap water spiked with the metal cation, making the method promising for quick and economical sensing of Pd(II).
摘要：
本文介绍了廉价且选择性的纸基分析设备（PAD）的开发，用于从非常酸性的水溶液中选择性测定Pd（II）。PAD是通过用偶氮配体浸渍两个厘米边的正方形滤纸获得的，（2-（四唑偶氮）-1,8二羟基萘-3,6，-二磺酸），称为TazoC。如此获得的橙色TazoC-PAD通过在低于2的pH下形成复杂的紫蓝色而与水溶液中的Pd（II）快速相互作用。染料在这样的酸性介质上不配合其他金属离子，使TazoC-PAD对Pd(II)检测具有高度选择性。此外,在较高的pH值，其他阳离子，例如,Cu(II)和Ni(II),可以通过形成稳定的粉红色洋红色复合物与TazoC相互作用；然而，可以使用多变量方法在其他阳离子存在下量化Pd(II)。为此,在300-800nm波长范围内记录与金属离子溶液平衡后的TazoC-PAD的UV-vis光谱。通过应用偏最小二乘回归(PLS)，当单独存在于溶液中以及存在Cu（II）和Ni（II）时，TazoC-PAD的整个UV-vis光谱与Pd（II）浓度有关。用基质匹配的标准溶液获得的量身定制的PLS模型正确预测了未知样品和掺有金属阳离子的自来水中的Pd（II）浓度，该方法有望用于快速，经济地传感Pd（II）。
