聚合物膜钙离子选择性电极的研制及其在形态分析中的应用
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- 英文论文题名：Preparation of Polymeric Membrane Calcium-Selective Electrode for the Speciation Analysis
- 论文作者：刘淑文 ; 尹坦姬 ; 秦伟
- 英文论文作者：Shu wen Liu ; Tanji Yin ; Wei Qin ; Yantai Institute of Coastal Zone Research ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院烟台海岸带研究所;
- 论文关键词：聚合物膜 ; 钙离子选择性电极 ; 超能斯特 ; 形态分析
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：O657.15
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：485k
- 原文格式：D
- 会议级别：全国
摘要
钙是自然界广泛存在并有重要作用的一种元素,许多重要的生理作用与钙的存在形态密切关系,因此钙离子选择电极在临床化学、生理、医学以及海水的研究中均有重要的应用。本文研制了传统型的和新型2种聚合物膜钙离子选择性电极分别对游离的钙离子活度和总钙浓度进行检测。传统的钙离子选择性电极能够实现低至10-6 M的钙离子活度的检测,而新型钙离子选择性电极以10-3 M CaCl_2,5×10-2 M Na2EDTA并用Na OH调节pH=9.00为内充液,在10-6-10-5 M Ca~(2+)范围内有超能斯特现象发生且电位差在100mv以上。在超能斯特响应范围内,加入适量EDTA与Ca~(2+)络合,通过调节pH使得缓冲样品溶液内含有不同浓度总钙但相同活度自由钙。用新型电极对缓冲样品溶液进行测定发现,该电极的电位响应与总钙浓度(10-6-10-5M)成近似线性相关,与钙离子的活度无关。因此,聚合物膜离子选择性电极可实现待测离子活度和总浓度的检测,有利于待测物质的形态分析。
Calcium,an element with important function closely related to it's speciation,is widespread in nature,therefore,calcium-selective electrodes has important application in clinical chemistry,physiology,medicine,and seawater.In this paper,we proposed the conventional and new polymeric membrane calcium-selective electrodes for the detection of the activity and total concentration of calcium respectively.Compared with the conventional electrode,the new Polymeric membrane calcium-selective electrode,with the inner solution of 10-3 M CaCl_2,5 × 10-2 M Na2 EDTA adjusted to pH=9.0 with Na OH exhibits an apparently super-Nernstian response at low sample activities of 10-6-10-5 M Ca~(2+).During the range of super-Nernstian response,when the chelator EDTA added to the sample,the calcium buffered sample solutions with varying total concentration but the same activity of calcium result in an increased Electromotive Forces,which depends on the total concentration of calcium and can be used as a calibration curve for the total concentration determinations.Therefore,polymeric membrane ion selective electrode has the potential to achieve the speciation analysis.
Calcium,an element with important function closely related to it's speciation,is widespread in nature,therefore,calcium-selective electrodes has important application in clinical chemistry,physiology,medicine,and seawater.In this paper,we proposed the conventional and new polymeric membrane calcium-selective electrodes for the detection of the activity and total concentration of calcium respectively.Compared with the conventional electrode,the new Polymeric membrane calcium-selective electrode,with the inner solution of 10-3 M CaCl_2,5 × 10-2 M Na2 EDTA adjusted to pH=9.0 with Na OH exhibits an apparently super-Nernstian response at low sample activities of 10-6-10-5 M Ca~(2+).During the range of super-Nernstian response,when the chelator EDTA added to the sample,the calcium buffered sample solutions with varying total concentration but the same activity of calcium result in an increased Electromotive Forces,which depends on the total concentration of calcium and can be used as a calibration curve for the total concentration determinations.Therefore,polymeric membrane ion selective electrode has the potential to achieve the speciation analysis.
引文
[1]Bakker E,Bühlmann P,Pretsch E.Chemical Reviews,1997,97(8):3083-3132.
[2]Lindner E,Gyurcsányi R E.Journal of Solid State Electrochemistry,2009,13(1):51-68.
[3]Ceresa A,Pretsch E,Bakker E.Analytical chemistry,2000,72(9):2050-2054.
[4]Sokalski T,Ceresa A,Fibbioli M,et al.Analytical Chemistry,1999,71(6):1210-1214.
[2]Lindner E,Gyurcsányi R E.Journal of Solid State Electrochemistry,2009,13(1):51-68.
[3]Ceresa A,Pretsch E,Bakker E.Analytical chemistry,2000,72(9):2050-2054.
[4]Sokalski T,Ceresa A,Fibbioli M,et al.Analytical Chemistry,1999,71(6):1210-1214.