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首页> 外文期刊>Electroanalysis >Quantifying Primary Silver Ions Contents in Poly(vinyl chloride) and Poly(n-butyl acrylate) Ion-Selective Membranes
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Quantifying Primary Silver Ions Contents in Poly(vinyl chloride) and Poly(n-butyl acrylate) Ion-Selective Membranes

机译：定量聚氯乙烯和聚丙烯酸正丁酯离子选择性膜中的初级银离子含量

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摘要

On a model example of silver selective, poly(vinyl chloride) (PVC) or poly(n-butyl acrylate) based plastic membranes, a method of primary ions quantification has been proposed. For this purpose the inductively coupled plasma mass spectrometry with laser ablation (LA ICP MS) was used. Significant differences of the ions distribution between examined membranes materials were observed. For both kinds of membranes the influence of the concentration of AgNO3 in conditioning solution was noticed. Conditioning in 0.1 M Solution resulted in a few times higher silver levels compared to expected for 100 mol% membrane saturation (relative to lipohilic salt content). This points to pronounced co-extraction of quite lipophilic nitrate anions. In the case of poly(n-butyl acrylate) based membranes, silver was accumulated mainly in the surface domain of the membrane, due to low mobility of silver ions in this material. This was experimentally proved by concentration profiles of silver across the poly(n-butyl acrylate) membrane, showing a lower contents inside the membrane, being in contrast to uniform distribution in PVC based matrix. The obtained silver contents in the membranes correlates well with potentiometric characteristic, low contents of silver corresponds to super-Nernstian responses in low Ag+ activities range, for about 75% of saturation the detection limit close to 10(-8) M is obtained, 100% saturation or even higher silver contents results in micromolar detection limits.
机译：在基于银的选择性聚氯乙烯（PVC）或聚丙烯酸正丁酯的塑料膜的模型实例中，提出了一次离子定量的方法。为此，使用了带有激光烧蚀的电感耦合等离子体质谱法（LA ICP MS）。在所检查的膜材料之间观察到离子分布的显着差异。对于两种膜，都注意到调节溶液中AgNO 3浓度的影响。与100 mol％膜饱和度（相对于脂质盐含量）的预期值相比，在0.1 M溶液中进行处理导致的银含量高出预期几倍。这表明了亲脂性硝酸根阴离子的明显共萃取。在基于聚（丙烯酸正丁酯）的膜的情况下，由于该材料中银离子的迁移率低，所以银主要在膜的表面区域中积累。通过银在聚（丙烯酸正丁酯）膜上的浓度分布实验证明了这一点，表明在膜内部的含量较低，这与PVC基基质中的均匀分布形成对比。膜中获得的银含量与电位特性密切相关，低银含量对应于低Ag +活性范围内的超能斯特响应，对于大约75％的饱和度，检测极限接近10（-8）M，获得100 ％饱和度或什至更高的银含量会导致微摩尔检测极限。

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