Medical College, Henan Polytechnic University, Jiaozuo 454003, China.
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
J Food Drug Anal. 2018 Apr;26(2):670-677. doi: 10.1016/j.jfda.2017.08.004. Epub 2017 Sep 22.
A mercury(II) ion-selective electrode with an ionic liquid (IL), 1-methyl-2-butylthioimidazolium bis(trifluoromethanesulphonyl)imide ([CCSim]NTf) as active material was constructed. Parameters affecting the performance of the electrodes such as the dosages of the IL and carbon nanotubes and the aqueous pH values were investigated. Experimental results indicated that the optimal composition of the electrode filling material was 47.6% [CCSim]NTf, 47.6% tetrabutylphosphonium bis(trifluoromethanesulphonyl)imide (TBPNTf) and 4.8% carboxylic multi-walled carbon nanotubes (MWCNTs-COOH). Under the selected conditions, the proposed electrodes showed a good linear response in the concentration range of 10-10 mol L and had a detection limit of 4.1 × 10 mol L. No great interference from common metal ions was found. The proposed electrodes were applied to determine Hg in seafood samples; the results were comparable to those of the direct mercury analyzer.
构建了一种以离子液体 1-甲基-2-丁基硫代咪唑鎓双（三氟甲烷磺酰基）亚胺([CCSim]NTf)为活性物质的汞(II)离子选择性电极。考察了影响电极性能的参数，如离子液体和碳纳米管的用量以及水相 pH 值。实验结果表明，电极填充材料的最佳组成为 47.6%[CCSim]NTf、47.6%四丁基膦双（三氟甲烷磺酰基）亚胺（TBPNTf）和 4.8%羧酸多壁碳纳米管（MWCNTs-COOH）。在所选择的条件下，所提出的电极在 10-10 mol L 的浓度范围内呈现出良好的线性响应，检测限为 4.1×10 mol L。未发现常见金属离子的严重干扰。将所提出的电极用于测定海鲜样品中的 Hg，结果与直接汞分析仪相当。
