溶胶凝胶法研制药物电极

报道了一种基于溶胶—凝胶技术的新型土霉素电极,详尽地讨论了电极性能的影响因子．该电极具有良好的能斯特响应,平均斜率为64．5mV／decade,线性范围为4．3×10^-6moL／L-1．0×10^-2mol,／L,检测下限为3．4×10^-6mol／L．适宜的pH范围为2．0-5．0．     

溶胶凝胶法制备碘离子电极

报道了一种以乙基紫为定域体试剂、溶胶一凝胶法制备的碘离子电极,该电极的线性范围为9．0×10^-7moL／L-1．0×10^-7mol／L,平均斜率为58．4mV／decade,检测下限为7．6×10^-7mol／L,适宜pH范围为3．1-11．5．     

电聚合烟酰胺构建新型亚硝酸盐电化学传感器

用循环伏安法电聚合烟酰胺（3-吡啶甲酰胺）,在玻碳电极上的制备了聚合物膜修饰电极,考察其对NO2^-及共存离子的作用情况,该修饰电极对NO2^-有良好的电化学催化作用和选择性,用差分脉冲伏安法（DPV）测定其氧化电流在N0f浓度1．68×10^-6mol／L~-1．76×10^-3 mol／L范围内呈线性关系,线性相关系数为0．999,检测限5．6×10^-7 mol／L。     

二氧化钛溶胶凝胶基质溴离子电极的研制与应用

用溶胶-凝胶法制备一种以溶胶凝胶为载体的溴离子选择电极.该电极有良好的能斯特响应,电极的响应范围为5.2 ×10-6 ～1.0×10-1 mol/L,斜率为53.5 mV/dec,检测下限为4.5×10-6 mol/L.电极响应快、体积小,稳定性和重现性好.电极用作测定药物,其结果令人满意.     

单壁碳纳米管复合膜电极电催化氧化山茛菪碱

制备以水作为分散剂的单壁碳纳米管-刚果红（SWCNTs—cR）的化学修饰电极,研究山莨菪碱在该修饰电极上的电化学行为和电化学动力学性质．结果表明：该修饰剂对山莨菪碱的氧化具有显著的电催化作用;山莨菪碱的氧化过程是不可逆的双电子双质子过程,其在该修饰电极上的扩散系数、速率常数分别为6．49×10^2cm2／s,6．52×10^3moL／（L·S）．基于实验优化分析条件,建立直接测定山莨菪碱的电化学定量分析方法,该方法的线性范围为1．73×10-5．17×10^-4mol／L和6．31X10^-5-L 14X10-4mol／L,检出限为1．74×10-4mol／L,同支电极的相对标准偏差（RSD）为3．66％．该方法也可用于山莨菪碱的含量测定．     

涂丝型PVC膜格拉司琼离子选择电极的研制与应用

目的建立盐酸格拉司琼片剂的测定方法。方法以盐酸格拉司琼与四苯硼钠生成缔合物为电活性物,制做涂丝型PVC膜格拉司琼电极。结果在pH4．5-6．5内,电极的Nemst响应范围为1．0×10^-2 - 5．0×10^-5 mol·L^-1,斜率为56．5mV／pc,检测限为2．3×10^-5mol·L^-1。结论用于该药品的含量测定,与高效液相色谱法基本一致。     

流动注射双安培法测定2，4-二氨基苯酚

利用2,4-二氨基苯酚在铂阳极上的催化氧化和不可逆电对构成的双安培定量分析理论,建立了直接测定2,4-二氨基苯酚的流动注射双安培法。使用已在恒电位下进行过预阳极化处理的双铂电极,在外加电压为零伏特时,通过在阳极上2,4-二氨基苯酚的氧化和在阴极上氧化铂的还原这两个不可逆电极反应过程,构成流动注射双安培检测体系。结果表明,在pH：8．69的B—R缓冲溶液中,2,4-二氨基苯酚的氧化电流与其浓度符合线性关系（r=0．9946,n=10）,其线性范围为4．0×10^-6mol／L～8．0×10^-4mol／L,检出限为6．0×10^-7mol／L。连续36次测定6．0×10^-5moL／L的2,4-二氨基苯酚溶液,电流值的RSD=3．12％。用流动注射双安培法测定样品中2,4-二氨基苯酚的含量,选择性和灵敏度很高,测定结果准确度较高。     

亚铁氰化钾修饰碳黑微电极测定抗坏血酸

研究了抗坏血酸(AA)在亚铁氰化钾修饰碳黑微电极上的电化学行为。实验结果表明,在pH7．0的磷酸盐中,AA在该电极上的线性范围为2．0×10-6-4．0×10-3mol／L;检出限(3σ)为1．0×10-6mol／L。用这种电极测定抗坏血酸的含量,结果满意。     

血红蛋白在二氧化钛球腔阵列上的直接电化学研究

采用Langmuir—Blodgett术和溶胶-凝胶（sol—gel）法在氧化铟锡（ITO）表面制备了TiO2球腔阵列．研究了TiO2球腔阵列的电化学性质,结果表明：所制备的TiO2球腔阵列具有微电极阵列特性．将血红蛋白（Hb）直接吸附在TiO2球腔阵列内部,制备过氧化氢（H2O2）生物传感器．修饰电极对过氧化氢（H2O2）的电流响应快速稳定、重现性和选择性较好,在9．00×10^-7～4．44×10^-4mol／L范围内H2O2浓度与响应电流呈现良好的线性关系,其检出限为3．12×10^-7mol／L,米氏常数为0．138mmol／L．     

聚1．10-菲络啉合钴（Ⅱ）化学修饰电极测一氧化氮的研究

文章介绍了电化学聚合1.10-菲络啉合钴（Ⅱ）化学修饰电极的制备，并对NO的响应范围及机理作了初步的研究．实验发现，用电化学方法聚合制备的该电极涂加Nation后对NO的检测有高的灵敏度和好的选择性．NO的浓度在4．2×10^-5～2．4×10^-7mol／L范围内氧化电流与浓度呈线性关系，其线性相关系数为0．996，检测限达4．8×10^-8mol／L；     

Ti基Hg膜电极微分脉冲伏安法测定磺胺嘧啶和甲氧苄啶

建立了一种微分脉冲伏安法检测磺胺嘧啶和甲氧苄啶的方法．采用光化学沉积Hg膜Ti基电极以及微分脉冲伏安法使得检测灵敏度大幅度提高,磺胺嘧啶的检测限为3．68×10^-11mol／L,回收率范围为96．87％-110．3％;甲氧苄啶的检测限3．25×10^-11mol／L,回收率范围为94．18％-103．3％．     

Electrocatalytic response of poly(cobalt tetraaminophthalocyanine)/multi-walled carbon nanotubes-Nafion modified electrode toward sulfadiazine in urine

A highly sensitive amperometric sulfadiazine sensor fabricated by electrochemical deposition of poly(cobalt tetraaminophthalocyanine) (poly(Co^IITAPc)) on the surface of a multi-walled carbon nanotubes-Nafion (MWCNTs-Nafion) modified electrode is described. This electrode showed a very attractive performance by combining the advantages of Co^IITAPc, MWCNTs, and Nafion. Compared with the bare glassy carbon electrode (GCE) and the MWCNTs-Nafion modified electrode, the electrocatalytic activity of poly(Co^IITAPc)-coated MWCNTs-Nafion GCE generated greatly improved electrochemical detections toward sulfadiazine including low oxidation potential, high current responses, and good anti-fouling performance. The oxidation peak currents of sulfadiazine obtained on the new modified electrode increased linearly while increasing the concentration of sulfadiazine from 0.5 to 43.5 μmol/L with the detection limit of 0.17 μmol/L.     

Electrochemical detection of hydrogen peroxide at a waxed graphite electrode modified with platinum-decorated carbon nanotubes

Platinum-decorated carbon nanotubes(CNT-Pt) were produced by the chemical reduction method. A novel modified electrode was fabricated by intercalated CNT-Pt in the surface of waxed graphite,which provided excellent electrocatalytic activity and selectivity for both oxidation and reduction of hydrogen peroxide. The current response of the modified electrode for hydrogen peroxide was very rapid and the detection limits in amperometry are 2.5×10-6 mol/L at reduction potential and 4.8×10-6 mol/L at oxidation po...     

CdTe量子点荧光猝灭法对银离子和钙离子的测定

以CdTe量子点为荧光探针,基于荧光猝灭法对Ag（Ⅰ）和Ca（Ⅱ）进行了定量检测.考察了缓冲液的浓度、缓冲液pH值、反应时间等多种因素的影响.结果表明：（1）在浓度为10～20 mmol/L、pH值为7～8的磷酸二氢钠-磷酸氢二钠缓冲液中,Ag＋与量子点反应时间为20 min时,量子点荧光衰减程度（ΔF）与Ag＋浓度呈...     

In-situ measurement of the dissolved S^2- in seafloor diffuse flow system： sensor preparation and calibration

The preparation approach and calibration result of an improved type of ion selective electrode （ISE）, which is used to measure the total dissolved S^2-, are introduced in this paper. The improved Ag/Ag2S electrode uses silver wire as the substrate, which is surrounded by electric polymer containing superfine silver powder. After the stabilization of the epoxy-resin, Ag2S layer was formed by chemical reaction with 0.2 mol/L （NH4）2S solution for 5 min. With Ag/AgC1 as reference electrode, the Ag/Ag2S electrode can be used to measure dissolved S^2-. The correlation between the measured potentials and the logarithm of dissolved S^2- is found to be linear, within range of the concentration of dissolved S^2- from 10^-2-10-7 mol/L. The slope of the regression line between measured potential and logarithm of dissolved S^2- is about -27.7, which agrees well with the theoretical Nernst value -29.6. Furthermore, the performance of the improved Ag/Ag2S electrode, such as the response time, sensitivity and stability, greatly outweighs the conventional Ag/Ag2S electrode.     

丁二酮肟修饰碳糊电极的制备及对Cu（Ⅱ）的测定

提出用丁二酮肟修饰碳糊电极的制备及对Cu（Ⅱ）的测定.以铂丝电极为对电极,Ag/AgCl电极为参比电极,在pH=3.2的邻苯二甲酸氢钾—盐酸缓冲溶液中通过在-1.0V电位下富集后,在-1.0V～＋0.6V电位范围内作线性扫描溶出伏安法测定,峰电流与Cu（Ⅱ）浓度在4.0×10^-6～5.0×10^-5mol/L范围内呈良好线性关系,当富集300s时检测限为1.0×10^-9mol/L,且大多数阳离子不干扰测试结果.