二(乙基黄原酸基)金属配合物为中性载体高选择性碘离子电极的研究

本文研究了二(乙基黄原酸基)金属配合物为中性载体的阴离子选择性电极,其中二(乙基黄原酸基)钴(Ⅱ)对碘离子有高的选择性, 且电极呈现反Hofmeister行为, 其选择次序是: I^->SCN^->NO2^->Br^->ClO4^->SO4^2^->NO3^->Cl^-, 采用交流阻抗和光谱分析技术研究了电极的响应机理, 并将电极用于药品分析,结果令人满意。     

新型钴配合物中性载体高选择性水杨酸根电极的研究

基于经典的离子交换剂如季铵盐、季鏻盐和邻菲罗啉配合物等的溶剂聚合膜电极对阴离子呈现出Hofmeister选择性序列.目前,研究反Hofmeister行为的阴离子选择性电极已成为化学传感器研究领域的重要研究方向之一.该类电极通常以金属卟啉及其衍生物、维生素B₁₂衍生物和金属酞菁及其衍生物等作为载体,研制出了SCN^-,NO₂^-,Cl^-和I^-等选择性电极.采用席夫碱金属配合物及金属汞.     

中性载体水杨酸根离子电极的研究

近年来,反Hofmeister行为的阴离子选择性电极的研究是离子电极研究领域中重要的研究方向之一[1],其中许多平面结构的Schiff碱金属配合物对特种阴离子表现较高选择性,以此研制了许多高选择性I-电极[2,3]、S al-电极[4-6]、SCN-电极[7,8].     

新型中性载体PVC膜高选择性硫氰酸根电极研究

研究了新型Schiff碱对溴苯甲醛缩邻氨基酚过渡金属配合物的阴离子响应行为。实验结果表明:以Cu(Ⅱ)配合物为载体的电极对硫氰酸根具有优良的电位响应性能(pH4.0),电极的线性范围为1.0×10-1～2.0×10-5mol/L,斜率为-59.4mV/dec,检出限为9.0×10-6mol/L。其反Hofmeister选择性次序为:SCN->Sal->I->ClO4->NO2->NO3->Br->SO42->Cl-,研究了阴离子与载体的作用机理,结果表明SCN-与载体中铜原子直接作用。电极可应用于废水及人体唾液中SCN-的测定。     

选择性中性载体硫氰酸根电极的研究

离子选择性电极由于操作方便,制作简单,成本低廉,近年来得到了快速的发展[1]。基于经典的离子交换剂如季铵盐、季钅粦盐及带正电荷的金属配合物作为载体的溶剂聚合膜电极对阴离子的选择性呈现出Hofmeister选择性序列[2],其选择性次序为:C lO4->SCN->I-≈Sal->NO3->Br->NO2->C l     

基于双核三苄基甲醇锡(Ⅳ)对苯二甲酸酯配合物为中性载体的硫氰酸根电极的研究

研究了双核三苄基甲醇锡(Ⅳ)对苯二甲酸酯配合物［Sn(Ⅳ)-BTMTT］为中性载体的PVC膜阴离子选择性电极。这类电极对硫氰酸根离子呈现出优良的电位响应性能和选择性,并呈现反Hofmeister序列行为。其选择性序列为:SCN-＞I-＞Ac-＞－NO＞2－2NO＞－4ClO＞Cl-＞3－4SO,该电极在pH＝3.0的磷酸盐缓冲体系中对SCN-在0.1～8×10-5mol／L浓度范围内呈超能斯特响应,斜率为-77.3mV／dec,检出限为4.0×10-5mol／L。采用交流阻抗及紫外光谱研究了阴离子与载体的作用机理。该电极具有响应快、重现性好、制备简单等优点。将该电极用于废水分析,结果令人满意。     

汞配合物为载体的高灵敏PVC膜碘离子选择电极研究

研究了基于四醋酸·双 ( 5 甲基 1,3 ,4 噻二唑 2 硫 ) -烷基合汞 (Ⅱ )配合物为中性载体的阴离子选择性电极 .这类电极对碘离子响应具有高灵敏和高选择性 ,并且呈现反Hofmeister序列行为 ,其选择性次序为 :I->SCN->ClO-4>Br->NO-3>Cl->AcO->SO2 -4.其中由四醋酸·双 ( 5 甲基 1,3 ,4 噻二唑 2 硫 ) -丁烷合汞 (Ⅱ)配合物为载体的电极在pH为 3 .0磷酸盐缓冲条件下对I-的线性响应范围为 4.0× 10 -8～ 1.0× 10 -2 mol/L ,检测限为 2 .0× 10 -8mol/L ,斜率为 -5 9.1mV/pcI- .通过紫外 -可见光谱和交流阻抗测试技术研究了电极的响应机理 .结果表明 ,配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之间有非常密切的构效关系 .将该电极应用于嘉陵江水和缙云山泉水的测定 ,其结果令人满意     

水杨醛二缩乙二胺锰(Ⅱ)配合物为载体的高选择性亚硫酸根离子电极的研究

研究了水杨醛二缩乙二胺锰(Ⅱ)配合物为载体的阴离子选择性电极。结果表明,水杨醛二缩乙二胺锰(Ⅱ)配合物对SO_3~(2-)有较高的选择性,且电极呈现反Hofmeister行为,其选择性次序为SO_3~(2-)>I~->SCN~->ClO_4~->NO_2~->NO_3~->S_2O_3~(2-)>Cl~->SO_4~(2-)。该电极响应速度快,具有良好的稳定性。用于化学试剂中SO_3~(2-)的测定,相对标准偏差为0.42％。     

甘氨酸Schiff碱三核铜(Ⅱ)配合物为载体的硫氰酸根离子电极的研究

研究了3-羧基水杨醛缩甘氨酸Schiff碱三核铜(Ⅱ)配合物[Cu(Ⅱ)-CGSBT]为中性载体的PVC膜阴离子电极,该电极对硫氰酸根离子(SCN-)具有优良的电位响应特征并呈现出反Hofmeister序列行为,其选择性顺序为:SCN- > ClO-4> I- > Sal- > NO-3> NO-2>F- >SO2-4>Br-> SO2-3>Cl-.电极在pH 5.0的磷酸盐缓冲溶液体系中对SCN-在5.6×10-6～0.1 mol/L范围内呈现近能斯特响应,斜率为-56.3 mV/dec,检出限为2.0 μmol/L.采用交流阻抗技术和红外光谱研究了阴离子与载体的作用机理.将电极应用于废水分析,结果令人满意.     

二氮杂四烯基金属配合物中性载体高选择性水杨酸根离子电极的研究

首次研究了基于二氮杂四烯基钴（Ⅱ）金属配合物{3,3′-[1,2-亚乙基（亚氨 基次甲基）]二－2,4－戊二酮基合钴（Ⅱ）}[Co(Ⅱ）-EBIBP]为中性载体的阴离 子选择性电极。该电极对水杨酸根（Sal^-)呈现出优良的电位响应性能和选择性, 且呈现出反Hofmeister序列行为,其选择性次序为Sal^->>I^->SCN^->NO2^- >SO4^2->NO3^->ClO4^->Br^->Cl^-。采用交流阻抗技术和光谱分析技术研究了电极 的响应机理。结果表明,配合物中心金属原子的结构以及载体本身的结构与电极的 响应行为之间有非常密切的构效关系。并将电极用于药品分析,其结果令人满意。     

Thiocyanate ion selective electrode based on bis(N-3-methylphenyl salicylidenaminato)copper(Ⅱ) ionophore

In this work a PVC membrane electrode based on bis(N-3-methyl phenyl salicylidenaminato)copper(II)as ionophore was prepared.The electrode was tested by inorganic anions and showed good selectivity for thiocyanate ion.This sensor showed Nerstian behavior with a slope of a-59.3 mV per decade at 25℃.The proposed electrode exhibited a wide linear range from 1.0 × 10~(-6) mol/L to 1.0× 10~(-1) mol/L with a detection limit of 5.0×10~(-7) mol/L.The electrode response was independent of pH in the range of 4.0-10.0.The response time is about 9-21s,and the electrode can be used for over 60 days without considerable deterioration.The prepared sensor was applied as an indicator electrode in potentiometric titration of SCN with Ag~+ ion and to determine the thiocyanate in samples of urine and saliva.     

水杨醛缩邻苯二胺双席夫碱敏感膜Cu(Ⅱ)离子选择性电极及SCN-的测定

用水杨醛和邻苯二胺合成了水杨醛缩邻苯二胺双席夫碱（SPS）,将其作为中性载体与碳粉混合,以液体石蜡为粘合剂,制备出能斯特响应铜(Ⅱ)离子选择性电极,应用于SCN^-的测定。 SCN-浓度在1.0×10^-6~1.0×10^-2 mol/L之间时该电极对其具有能斯特响应,检测下限为4.0×10^-7 mol/L。 在pH值为3.5~4.6的SCN^-溶液中,电极的响应时间均小于30 s。电极的稳定性好,灵敏度高,使用寿命长,已用于废水中SCN^-的分析。     

双水杨醛缩乙二胺合铜(Ⅱ)席夫碱金属配合物的合成及应用

合成了双水杨醛缩乙二胺合铜(Ⅱ)[Cu(Ⅱ)-EDBSAD]席夫碱金属配合物,并以该配合物为中性载体制备PVC膜电极,该电极对SCN-具有优良的电位响应特性,在pH=5.5磷酸盐缓冲溶液中,SCN-浓度在1.0×10-1～1.0×10-7 mol/L之间具有能斯特响应,校准曲线方程为Ｅ(mV)＝-51.75lg cSCN--255.29,检测下限为5.6×10-8 mol/L。 将电极用于废水中硫氰酸盐含量的测定,结果与高效液相色谱法基本一致。     

Binuclear Schiff base complex of manganese(III) as a neutral carrier for a highly selective iodide electrode.

A new highly selective iodide electrode incorporating a binuclear manganese(III) complex, bis(salicylaldehyde-aminopropanol)dichloroaceticdimanganese(III) [Mn(III)(2)-BSAPDCA], as a neutral carrier is described. The electrode displays an anti-Hofmeister selectivity sequence: iodide > perchlorate > salicylate > thiocyanate > nitrate > bromide > nitrite > chloride > sulfate. The excellent selectivity for iodide is related to a direct interaction between the central Mn(III) atom and iodide and a steric effect associated with the structure of the carrier, which is supported by UV spectroscopy and AC impedance techniques. The electrode exhibits a near-Nernstian potentiometric linear response range to iodide from 1.0 x 10(-1) to 2.0 x 10(-5) mol/L with a detection limit of 8.0 x 10(-6) mol/L and a slope of -60.3 mV/decade in pH 3.0 of phosphate buffer solutions at 20 degrees C. From a comparison of the potentiometric response characteristics between a binuclear manganese(III) complex, Mn(III)(2)-BSAPDCA, and a mononuclear manganese(III) complex, Mn(III)-BSAPB, an enhanced response towards iodide from a binuclear metallic complex-based electrode was observed. The electrode, based on binuclear manganese(III) complex, was successfully applied to the determination of inorganic total iodine in iodized table salt with satisfactory results.     

Highly selective thiocyanate poly(vinyl chloride) membrane electrode based on a cadmium-Schiff's base complex

A PVC membrane electrode based on a cadmium-salen (N,N'-bis-salicylidene-1,2-ethylenediamine) complex as an anion carrier is described. The electrode has an anti-Hofmeister selectivity sequence with a preference for thiocyanate at pH 1.5-11.0. It has a linear response to thiocyanate from 1.0 x 10(-6) to 1.0 x 10(-1) mol L(-1) with a slope of 59.1 +/- 0.2 mV per decade, and a detection limit of 7 x 10(-7) mol L(-1). This electrode has high selectivity for thiocyanate relative to many common organic and inorganic anions. The proposed sensor has a fast response time of approximately 15 s. It was applied to the determination of thiocyanate in a milk sample.     

苯甲醛缩氨基脲铜（II）配合物为载体的高选择性硫氰酸根离子电极的研究

首次研究以苯甲醛缩氨基脲铜（II）[Cu(II)-BASA]为中性载体的PVC膜电极， 该电极对硫氰酸根离子（SCN~-）具有优良的电位响应特性并呈现出反Hofmeister 选择性行为，其选择性次序为：SCN~- > ClO_4~- > I~- > Sal~- > Br~- > NO_3~- > Cl~- > NO_2~- > SO_3~(2-) > SO_4~(2-) > H_2PO_4~-。电极在pH 6. 0的磷酸盐缓冲体系中，对SCN~-在1.0 * 10~(-1)～8.0 * 10~(-6) mol/L浓度范围 内呈近能斯特响应，斜率为56.0 mV/sSCN~- (28 ℃)，检测下限为3.0 * 10~(-6) mol/L。采用交流阻抗技术和紫外可见光谱技术初步研究了阴离子与载体的作用机 理，结果表明配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之 间有非常密切的构效关系。该电极具有响应快、重现性好、检测限低、制备简单等 优点。将电极初步应用于实际样品废水分析，结果与HPLC法一致。     

Development of a Poly(vinyl chloride)-based Nitrate Ion-selective Electrode

The authors developed a nitrate ion-selective electrode(ISE) based on poly(vinyl chloride)(PVC) membrane with methyltrioctylammonium nitrate as a carrier and 1-decanol as a plasticizer. The performance of the nitrate-sensitive membranes was optimized by tuning the composition of components. The electrode exhibits a linear response with a Nernstian slope of (52±1.0) mV per decade for the nitrate ion concentration ranging from 5.8×10^-5 mol/L to 1.0 mol/L. The electrode can be used to detect a low concentration of nitrate ions down to 3×10^-5 mol/L in a pH range of 2.1-11.5 without any compensation. The advantage of the electrode includes simple preparation, short response time and good repeatability. The detection performance of the novel electrode on nitrate ions has been tested for water samples.     

白藜芦醇在银电极上的吸附伏安行为及其应用

白藜芦醇(3,5,4-三羟基芪)通常存在于葡萄、桑椹等多种植物中, 葡萄酒中也有一定的含量[1]. 由于白藜芦醇对防治癌症、动脉硬化和冠心病等疾病有较好的疗效[1,2], 近年来对白藜芦醇生物活性的研究日益受到重视. 白藜芦醇的测定一般采用高效液相色谱和毛细管电泳等方法[3～5], 这些方法均需对样品进行减压浓缩和萃取等处理, 比较繁琐. 本文对白藜芦醇在银电极上的吸附伏安行为进行了研究, 并将其应用于葡萄酒中白藜芦醇含量的直接测定, 获得了较好的实验结果.     

Determination of Trace Silver( Ⅰ ) in Basic Aqueous Solution by Electrochemiluminescence of a New Reagent 6-(2-Hydroxy-4-Diethylaminophenylazo)-2,3-Dihydro-1,4-Phthalazine-1,4-Dione

The electrochemiluminescence (ECL) of a new reagent 6- (2-hydroxy- 4 diethy laminophenylazo)-2,3-dihydro-1 ,4-phthalazine-1,4-dione (HDEA) in a basic aqueous so lution was studied by using the apparatus designed by ourselves. Trace amounts of silver ( Ⅰ ) shows a significant effect on the efficiency of light emission of HDEA during a positive trigonometrical wave pulse was exerted on the solution. The linear relationship between the light intensity and the concentration of silver( Ⅰ ) occurs in the range of 5. 0×10-8 to 3. 0×10-8 mol/L Ag(Ⅰ ) in a medium of KOH-KCl-HDEA (pH= 12. 8). The detection limit of the method is 2. 0×10-8 mol/LAg( Ⅰ ), and the r. s. d. for 1.0×10-7 mo)/L Ag ( Ⅰ ) is 5%. Of 21 metal ions concerned, only nickel( Ⅱ ), cerium( Ⅳ ) and cobalt( Ⅱ ) interfere the silver detection seriously; Ⅰ and Br also have some interference.