Abstract

In this research, different electrodes were made by combining certain percentages of carbon paste for a range of cations. Then, ligand selectivity was calculated for each cation using a potentiometric method to identify the most sensitive cation. A modified carbon paste electrode was applied to the quantification of chromium cation based on carbon nanotubes. In addition, paraffin, graphite, and 1,13-bis(8-quinolyl)-l,4,7,10,13-pentaoxatridecane were utilized in the manufacture of the electrodes. To get an optimum composition, D-optimal test design method was employed to increase electrode sensitivity and placement accuracy. Upon combining optimal percentages, this electrode showed the Nernstian response within the concentration range of 1.0 × 10^–10–1.0 × 10^–2 M, slope of 19.63 mV/decade with a detection limit of 3 × 10^–11 M. The potential was found to remain constant within the pH range of 5.0–9.0, while a gradual deviation was observed outside this range.

中文翻译：

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多壁碳纳米管修饰碳糊电极电位法测定铬（Ⅲ）的制备。

摘要

在这项研究中，通过将一定百分比的碳糊组合成一定范围的阳离子，制成了不同的电极。然后，使用电位测定法计算每个阳离子的配体选择性，以鉴定最敏感的阳离子。将修饰的碳糊电极应用于基于碳纳米管的铬阳离子定量。另外，在电极的制造中使用了石蜡，石墨和1,13-双（8-喹啉基）-1,4,7,10,13-五氧杂十六烷。为了获得最佳的成分，采用D最佳测试设计方法来增加电极灵敏度和放置精度。结合最佳百分比后，此电极在1.0×10 ^–10 –1.0×10 ^–2的浓度范围内显示能斯特响应男，与3×10的检测极限19.63毫伏/十倍的斜率^-11 M的电位被发现的pH范围5.0-9.0内保持恒定，而在此范围之外观察到一个逐渐偏离。