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Polymeric Membrane Fluoride-Selective Electrodes Using Lewis Acidic Organo-Antimony(V) Compounds as Ionophores
ACS Sensors ( IF 8.2 ) Pub Date : 2020-10-28 , DOI: 10.1021/acssensors.0c01481 Long Li 1 , Yihao Zhang 1 , Ying Li 1 , Yinghui Duan 2 , Yi Qian 2 , Peidong Zhang 1 , Qingjie Guo 3 , Jiawang Ding 4, 5
ACS Sensors ( IF 8.2 ) Pub Date : 2020-10-28 , DOI: 10.1021/acssensors.0c01481 Long Li 1 , Yihao Zhang 1 , Ying Li 1 , Yinghui Duan 2 , Yi Qian 2 , Peidong Zhang 1 , Qingjie Guo 3 , Jiawang Ding 4, 5
Affiliation
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Four Lewis acidic organo-antimony(V) compounds with strong binding affinity to fluoride were used for the first time as ionophores to fabricate polymeric membrane fluoride-selective electrodes. Improved detection limits and significant anti-Hofmeister selectivity could be achieved by optimizing ionophores, lipophilic additives, and plasticizers. Membrane electrodes fabricated with tetrakis-(pentafluorophenyl)stibonium (ionophore 2) performed best in detection limit, sensitivity, and selectivity. Optimal performance was obtained by fluoride with a slope of −59.5 mV/decade in the linear range of 1 × 10–5 to 4 × 10–2 M and a detection limit of 5 × 10–6 M. Studies on the influence of sample solution pH demonstrate that the best pH for fluoride determination is pH 3.0. All of the electrodes studied respond rapidly (in 1 min) in different concentrations of fluoride solutions. The anion–ionophore complex constants in the membrane phase determined using the segmented sandwich membrane method correlate well with the solution-phase binding data and determined selectivity sequence of the ion-selective electrodes. The possibility of real life application of the optimized electrodes was assessed by determination of fluoride concentrations in tap water.
中文翻译：
使用路易斯酸性有机锑（V）化合物作为离子载体的高分子膜氟化物选择电极
首次使用对氟化物具有强结合亲和力的四种路易斯酸性有机锑（V）化合物作为离子载体来制备聚合物膜氟化物选择性电极。通过优化离子载体，亲脂性添加剂和增塑剂，可以提高检测限和显着的抗霍夫迈斯特选择性。用四（五氟苯基）sti（离子载体2）制成的膜电极在检测限，灵敏度和选择性方面表现最佳。氟化物在-1×10 –5至4×10 –2 M的线性范围内具有−59.5 mV /十倍的斜率，可获得最佳性能，检测限为5×10 –6M.对样品溶液pH值影响的研究表明，氟化物测定的最佳pH值为pH 3.0。所有研究的电极在不同浓度的氟化物溶液中都能快速响应（在1分钟内）。使用分段夹心膜法测定的膜相中的阴离子-离子载体络常数与溶液相结合数据和确定的离子选择电极的选择性顺序密切相关。通过确定自来水中氟化物的浓度来评估优化电极实际应用的可能性。
更新日期：2020-11-25
中文翻译：
使用路易斯酸性有机锑（V）化合物作为离子载体的高分子膜氟化物选择电极
首次使用对氟化物具有强结合亲和力的四种路易斯酸性有机锑（V）化合物作为离子载体来制备聚合物膜氟化物选择性电极。通过优化离子载体，亲脂性添加剂和增塑剂，可以提高检测限和显着的抗霍夫迈斯特选择性。用四（五氟苯基）sti（离子载体2）制成的膜电极在检测限，灵敏度和选择性方面表现最佳。氟化物在-1×10 –5至4×10 –2 M的线性范围内具有−59.5 mV /十倍的斜率，可获得最佳性能，检测限为5×10 –6M.对样品溶液pH值影响的研究表明，氟化物测定的最佳pH值为pH 3.0。所有研究的电极在不同浓度的氟化物溶液中都能快速响应（在1分钟内）。使用分段夹心膜法测定的膜相中的阴离子-离子载体络常数与溶液相结合数据和确定的离子选择电极的选择性顺序密切相关。通过确定自来水中氟化物的浓度来评估优化电极实际应用的可能性。
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