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首页> 外文期刊>Journal of the Brazilian Chemical Society >A novel Ho(III) sensor based on N,N'-bis(2-pyridinecarboxamide)-1,2-benzene as a neutral ion carrier
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A novel Ho(III) sensor based on N,N'-bis(2-pyridinecarboxamide)-1,2-benzene as a neutral ion carrier

机译：基于N，N'-双（2-吡啶甲酰胺）-1,2-苯作为中性离子载体的新型Ho（III）传感器

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摘要

N,N'-bis(2-pyridinecarboxamide)-1,2-benzene (H2BPB) was found to have a selective and sensitive behavior towards Ho(III) ion, in comparison to a large number of lanthanide, inner transition and representative metal ions and was hence applied as a neutral ionophore, for preparing an Ho(III) membrane sensor, with high selectivity and sensitivity. The membranes, also contain potassium tetrakis(p-chlorophenyl) borate as an anionic additives, and were tested by using different plasticizing solvent mediators such as benzyl acetate (BA), nitrobenzene (NB), and o-nitrophenyloctyl ether (NPOE). The optimum composition was found to be H2BPB-PVC-KTpC1PB-BA with the ratios of 6.0: 30.0: 4.0: 60.0, respectively. Having a Nernstian response of 19.6 +/- 0.2 mV per decade of Ho(III) activity, the linear range of the sensor was found to be relatively wide (from 1.0 x 10(-5) to 1.0 x 10(-2) mol L-1). It can work well in the pH range of 3.0-11.5. The lower detection limit (LDL) of the sensor was calculated to be 8.0 x 10(-6) mol L-1. The excellent Ho(III)-selectivity of the proposed sensor with regard to most common metal ions, and especially, all lanthanide ions, is another advantage that can be mentioned about this sensor. The sensor was successfully used as an indicator electrode for titration of 25 mL of a 1.0 x 10(-4) mol L-1 Ho(III) ions with a 1.0 x 10(-2) mol L-1 EDTA, and vise versa. To the best of our knowledge this is the first Ho(III)-selective sensor.
机译：与大量的镧系元素，内部过渡和代表性金属相比，N，N'-双（2-吡啶甲酰胺）-1,2-苯（H2BPB）被发现对Ho（III）离子具有选择性和敏感性。离子，因此被用作中性离子载体，用于制备具有高选择性和灵敏度的Ho（III）膜传感器。该膜还含有四（对氯苯基）硼酸钾作为阴离子添加剂，并通过使用不同的增塑溶剂介体进行了测试，例如乙酸苄酯（BA），硝基苯（NB）和邻硝基苯基辛基醚（NPOE）。发现最佳组成是H2BPB-PVC-KTpC1PB-BA，其比例分别为6.0：30.0：4.0：60.0。每十年的Ho（III）活性具有19.6 +/- 0.2 mV的Nernstian响应，发现传感器的线性范围相对较宽（从1.0 x 10（-5）到1.0 x 10（-2）mol） L-1）。在3.0-11.5的pH范围内可以很好地工作。传感器的检测下限（LDL）计算为8.0 x 10（-6）mol L-1。相对于大多数常见金属离子，尤其是所有镧系元素离子，拟议的传感器具有极好的Ho（III）选择性，这是该传感器的另一个优势。该传感器已成功用作指示电极，用于用1.0 x 10（-2）mol L-1 EDTA滴定25 mL的1.0 x 10（-4）mol L-1 Ho（III）离子，反之亦然。据我们所知，这是第一个Ho（III）选择性传感器。

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