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首页> 外文期刊>Analytica chimica acta >Zn(II) complex-based potentiometric sensors for selective determination of nitrate anion
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Zn(II) complex-based potentiometric sensors for selective determination of nitrate anion

机译：基于锌（II）配合物的电位传感器，用于选择性测定硝酸根阴离子

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Polymeric membranes containing new Zn(II) complexes as anion carriers were prepared for determination of nitrate anion present in water samples. Two Zn(II) complexes coordinated by neutral tetradentate ligands, N,N'-ethylene-bis(N-methyl-(S)-alanine methylamide) and N,N'-ethylene-bis(N-methyl-(S)-alanine dimethylamide), worked well as anion-selective carriers, while common phthalocyanine Zn(II) complex rarely responded to any anions. The combination of these new Zn(II) complexes with dioctylsebacate as a plasticizer particularly offered high sensing selectivity for nitrate anion. They exhibited near-Nernstian slopes in the wide linear concentration range of 5.0 x 10(-5) to 1.0 x 10(-1) M, and operated well in the wide pH range from 4 to 11 with the response time of less than 25 s. The potentiometric selectivity coefficients were evaluated using the fixed interference method, indicating that the two Zn(II) complexes exhibited better selectivity for nitrate anion with respect to a wide variety of inorganic anions. Although chloride anion worked as an interfering species at a concentration higher than 1.0 x 10(-3) M, the new Zn(II) complex-based sensors were applicable in determination of the nitrate anion after adding silver sulfate to remove the chloride anion. (c) 2006 Elsevier B.V. All rights reserved.
机译：制备了含有新型Zn（II）配合物作为阴离子载体的聚合物膜，用于测定水样中的硝酸根阴离子。由中性四齿配体配位的两个Zn（II）配合物，N，N'-亚乙基-双（N-甲基-（S）-丙氨酸甲酰胺）和N，N'-亚乙基-双（N-甲基-（S）-丙氨酸二甲酰胺）作为阴离子选择载体效果很好，而普通的酞菁Zn（II）络合物很少对任何阴离子产生反应。这些新的Zn（II）配合物与癸二酸二辛酯作为增塑剂的组合特别提供了对硝酸根阴离子的高传感选择性。它们在5.0 x 10（-5）到1.0 x 10（-1）M的宽线性浓度范围内表现出近能斯特斜率，并且在4至11的宽pH范围内表现良好，响应时间小于25 s。使用固定干扰法评估电位选择系数，表明两种Zn（II）配合物相对于多种无机阴离子对硝酸根阴离子具有更好的选择性。尽管氯离子以高于1.0 x 10（-3）M的浓度作为干扰物质起作用，但新的基于Zn（II）配合物的传感器可用于添加硫酸银去除氯离子后测定硝酸根阴离子。 （c）2006 Elsevier B.V.保留所有权利。

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