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离子选择性电极法测定离子液体中的氟离子 总被引:1,自引:0,他引:1
旨在探究是否可以利用离子选择性电极法对1-己基-3-甲基咪唑四氟硼酸盐(HmimBF4)离子液体复合材料中的氟离子进行测定。得到线性响应范围是pF值为0.5~5,最适pH值为6,其检出下限为1×10~(-5) mol/L,精密度为0.75%,测得离子液体的氟离子浓度为0.19 mol/L,加标回收率为97.2%~103.2%。结果表明,离子选择性电极法具有实际操作简单、响应时间短、加标回收率高、精密度高、准确度好等优点,所以可用于样品的测定。 相似文献
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《Analytical letters》2012,45(10):523-535
Abstract A new solid-state cadmium ion selective electrode is evaluated. Interference effects are considered and the electrode is used to detect the endpoint in titrations of cadmium ion in water and in dimethylsulfoxide. 相似文献
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《Analytical letters》2012,45(6):927-935
Abstract An ion-selective electrode based on ionomycin methyl ester, a derivative of the naturally occurring carboxylic polyether antibiotic ionomycin, is described which exhibits high Li+ selectivity. The selectivity coefficients of the electrode based on ionomycin methyl ester, log Kpot LiNa and log Kpot LiK are -1.3 and -1.9, respectively. 相似文献
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氟电极是测试氟离子的良好指示电极,由于定量方法简单,响应快,灵敏度高,线性范围宽,深受用户欢迎。氟电极使用前经活化并冲洗至空白电位值后即可使用。 相似文献
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Solid Contact Nitrate Ion‐Selective Electrode Based on Ionic Liquid with Stable and Reproducible Potential 下载免费PDF全文
Cecylia Wardak 《Electroanalysis》2014,26(4):864-872
A simple, fast and cheap method of preparation of solid contact nitrate ion‐selective electrode is proposed. The electrode membrane phase consist of only three components: PVC, plasticizer and ionic liquid (IL).The ionic liquid trihexyltetradecylphosphonium chloride is used in triple function as ionophore, as lipophilic ionic component in order to reduce membrane resistance, and as transducer media in order to stabilize the potential of internal Ag/AgCl electrode. The electrical properties of the membrane were studied by electrochemical impedance spectroscopy and the influence of the interfacial water film was evaluated by potentiometric water layer test. 相似文献
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A method of ion selective electrode was proposed for the analysis of inorganic pollutants such as silver, lead, cadmium, cyanide, fluoride and bromide in river water. Samples taken from five areas, Bih-Tarn, Wan-Lung, Taipei Shui-Yuan-Ti, Guei-Shan Industrial Area and Dah-Hahn-Shi were analyzed in this investigation. Under the conditions of this work, the ion activities were measured down to 10?7M, and precision of all ions was within ±2%. This method is very simple and precise and is recommended for the analysis of polluted water. 相似文献
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采用离子选择电极法对生活饮用水中氟化物浓度进行了测定。讨论了水样中pH值、温度、响应时间对测定结果的影响。在最佳条件下,方法的线性范围为0.10~3.0mg/L,相关系数为0.9999,检出限为0.05mg/L,实际水样加标回收率为97%~106%,相对标准偏差(n=5)为0.04%~0.65%。方法简单快速,干扰小,重现性好,加标回收率令人满意,能进行生活饮用水中氟化物浓度的有效测定。 相似文献
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Imidazolium based room temperature ionic liquids have been used to extract selectively L-tryptophan from fermentation broth. BF4 anion was found to enhance dramatically the partitioning of L-tryptophan into ionic liquid phase from aqueous solutions. 相似文献
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建立了用阴离子交换分离柱、化学抑制模式、电导检测测定系列离子液体中BF-4阴离子及其他杂阴离子(F-、Cl-、Br-)含量的方法,并用于在线监控离子液体合成工艺中阴离子杂质含量.确定淋洗液组成为1.6 mmol/L Na2CO3+3.9 mmol/L NaHCO3,流速为0.6 mL/min.本方法对所测阴离子检出限分别为50 μg/L(F-、Br-)和80 μg/L(BF-4);线性范围在3个数量级以上;r>0.999;回收率在98%~102%之间.方法用于对离子液体小试工艺样品分析及过程监控时,结果满意,样品的RSD小于2.6%(n=6). 相似文献
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离子交换色谱法检测离子液体中阴离子 总被引:3,自引:0,他引:3
建立了用阴离子交换分离柱、化学抑制模式、电导检测测定系列离子液体中BF4^-阴离子及其他杂阴离子(F^-、Cl^-、Br^-)含量的方法,并用于在线监控离子液体合成工艺中阴离子杂质含量。确定淋洗液组成为1.6mmol/L Na2CO3+3.9mmol/L NaHCO3,流速为0.6mL/min。本方法对所测阴离子检出限分别为50μg/L(F^-、Br^-)和80μg/L(BF4^-);线性范围在3个数量级以上;r〉0.999;回收率在98%~102%之间。方法用于对离子液体小试工艺样品分析及过程监控时,结果满意,样品的RSD小于2.6%(n=6)。 相似文献
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Ftima A. R. Mota Sarah A. P. Pereira Andr R. T. S. Araujo M. Lúcia M. F. S. Saraiva 《Molecules (Basel, Switzerland)》2021,26(1)
Human neutrophil elastase (HNE) is used as diagnostic biomarker for inflammation/infection. In this work, 10 ionic liquids (ILs) and 11 ionic liquids active pharmaceutical ingredients (ILs-APIs) were tested to evaluate the inhibition effect on the activity of porcine pancreatic elastase enzyme, frequently employed as a model for HNE. The insertion of ionic liquids in some drugs is useful, as the insertion of ILs with inhibitory capacity will also slow down all processes in which this enzyme is involved. Therefore, a spectrophotometric method was performed to the determination of EC50 values of the compounds tested. EC50 values of 124 ± 4 mM to 289 ± 11 mM were obtained, with the most toxic IL for elastase being tetrabutylammonium acetate and the least toxic 1-butyl-3-methylimidazolium acetate. Moreover, sodium salicylate (raw material) presented the lower and benzethonium bistriflimide the higher EC50 when compared with all the IL-APIs tested. This work provides significant information about the effect of the studied IL and IL-APIs in elastase enzyme activity. 相似文献
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Marcin Smiglak Dr. C. Corey Hines Timothy B. Wilson Shailendra Singh Dr. Adam S. Vincek Dr. Kostyantyn Kirichenko Dr. Alan R. Katritzky Prof. Robin D. Rogers Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(5):1572-1584
Compartmentalized molecular level design of new energetic materials based on energetic azolate anions allows for the examination of the effects of both cation and anion on the physiochemical properties of ionic liquids. Thirty one novel salts were synthesized by pairing diverse cations (tetraphenylphosphonium, ethyltriphenylphosphonium, N‐phenyl pyridinium, 1‐butyl‐3‐methylimidazolium, tetramethyl‐, tetraethyl‐, and tetrabutylammonium) with azolate anions (5‐nitrobenzimidazolate, 5‐nitrobenzotriazolate, 3,5‐dinitro‐1,2,4‐triazolate, 2,4‐dinitroimidazolate, 4‐nitro‐1,2,3‐triazolate, 4,5‐dinitroimidazolate, 4,5‐dicyanoimidazolate, 4‐nitroimidazolate, and tetrazolate). These salts have been characterized by DSC, TGA, and single crystal X‐ray crystallography. The azolates in general are surprisingly stable in the systems explored. Ionic liquids were obtained with all combinations of the 1‐butyl‐3‐methylimidazolium cation and the heterocyclic azolate anions studied, and with several combinations of tetraethyl‐ or tetrabutylammonium cations and the azolate anions. Favorable structure–property relationships were most often achieved when changing from 4‐ and 4,5‐disubstituted anions to 3,5‐ and 2,4‐disubstituted anions. The most promising anion for use in energetic ionic liquids of those studied here, was 3,5‐dinitro‐1,2,4‐triazolate, based on its contributions to the entire set of target properties. 相似文献
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离子液体在气体分离中的应用 总被引:1,自引:0,他引:1
离子液体是一类“可设计溶剂”,具有极低的蒸气压,几乎不挥发以及选择性溶解能力,近年来在气体分离领域得到了广泛的关注。本文综述了CO2和SO2等酸性气体、低碳链烷烃、烯烃和炔烃等有机气体,以及H2、O2、CO、N2、Ar、Xe等其他气体在离子液体中的溶解性能,归纳了气体在离子液体中的溶解机理和溶解规律,分析了离子液体结构与溶解度、分离性质的定性关系,其中具有胺基、胍基等碱性基团的功能化离子液体对CO2、SO2等酸性气体具有良好的溶解性,含有不饱和基团的离子液体通过π-π相互作用可以改善烯烃在离子液体中的溶解度,炔烃则易溶于氢键碱性较强的离子液体;并介绍了离子液体/气体二元体系分子模拟、溶解度关联模型以及离子液体固定化用于气体分离等工作的研究进展,探讨了离子液体气体分离研究存在的问题和未来发展方向。 相似文献
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Densities and speeds of sound of three ionic liquids (ILs), 1-ethyl-3-methyl imidazoliumtetrafluoroborate (C2mimBF4), 1-butyl-3-methylimidazoliumtetrafluoroborate (C4mimBF4) and 1-hexyl-3-methylimidazoliumtetrafluoroborate (C6mimBF4) were measured in aqueous solutions at (288.15, 293.15, 298.15, 303.15 and 308.15) K. These data were used to calculate the volumetric properties apparent molar volume and apparent molar isentropic compression as a function of molality. Infinite dilution values for these properties were evaluated by an extrapolation procedure based on Redlich–Meyer type equations. Apparent molar isobaric expansions at infinite dilution were also obtained from the slopes of the apparent molar volume at infinite dilution versus temperature. All these properties are interpreted in terms of IL–water interactions. The hydrolysis of the \( {\text{BF}}_{4}^{ - } \) anion of the ILs and its effects on the results is discussed. 相似文献