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Trace Determination of Zirconium(Ⅳ) by Anodic Adsorptive Voltammetry at a Carbon Paste Electrode 被引量:4
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作者 XunMAO HuanXinLAI JuNanLI PengGAO ZhiHongYAN 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第11期1315-1318,共4页
A new sensitive adsorptive voltammetric method was described for the determination of zirconium at a carbon paste electrode (CPE) in the presence of alizarin complexone (ALC). Optimal analytical conditions are: 1.0?0... A new sensitive adsorptive voltammetric method was described for the determination of zirconium at a carbon paste electrode (CPE) in the presence of alizarin complexone (ALC). Optimal analytical conditions are: 1.0?0-6 or 5.0?0-7 mol/L ALC, 0. 20 mol/L HAC-NaAc (pH 4.3), accumulation for 60 s at 0 V (vs. SCE), and linear scanning from 0 V to 1.0 V at 250 mV/s. The peak potential of the complex is at 0.81 V. By using a model JP-303 polarographic analyzer, 2.0?0-10 mol/L (S/N=3) zirconium can be detected with a 90 s accumulation, when the 2nd-order derivative linear sweep technique is used, and the linear range is 6.0?0-10-2.0?0-8 mol/L (5.0?0-7 mol/L ALC) and 2.0?0-8-2.0?0-7 mol/L (1.0?0-6 mol/L ALC), respectively. The developed method was applied to the determination of trace zirconium in the ore samples with satisfactory results. 展开更多
关键词 ZIRCONIUM alizarin complexone carbon paste electrode anodic adsorptive voltamme- try.
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Determination of trace amount of antimony (Ⅲ) by adsorption voltammetry on carbon paste electrode
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作者 郭会时 肖鹏峰 +2 位作者 聂立波 李益恒 何农跃 《Journal of Southeast University(English Edition)》 EI CAS 2004年第2期221-225,共5页
A sensitive method is described for the determination of trace antimony based on the antimony-bromopyrogallol red (BPR) adsorption at a carbon paste electrode (CPE). Three steps were involved in the overall analysis: ... A sensitive method is described for the determination of trace antimony based on the antimony-bromopyrogallol red (BPR) adsorption at a carbon paste electrode (CPE). Three steps were involved in the overall analysis: preconcentration,reduction and stripping. Optimal conditions were found to be an electrode containing 25% paraffin oil and 75% high purity graphite powder as working electrode;a 0.10 mol/L HCl solution containing 40 μmol/L BPR as accumulation medium;a 0.20 mol/L HCl solution as reduction and stripping electrolyte;accumulation time,150 s;reduction potential and time,-0.50 V,60 s;scan range from -0.50 to 0.20 V. Interferences by other ions were studied as well. The detection limit was found to be 0.5 nmol/L for 150 s preconcentration. The linear range was from 1.0 nmol/L to 0.50 μmol/L. Application of the proposed method to the determination of antimony in water and human hair samples gave good results. 展开更多
关键词 ANTIMONY bromopyrogallol red carbon paste electrode adsorptive voltammetry
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Determination of Lead in Water by Linear Sweep Anodic Stripping Voltammetry (LSASV) at Unmodified Carbon Paste Electrode: Optimization of Operating Parameters
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作者 Ndoye Mouhamed Kane Cheikhou +3 位作者 Gadji Elhadji Momar Rokhy Diédhiou Moussa Bagha Mar-Diop Codou Guèye Theo Tzedakis 《American Journal of Analytical Chemistry》 2018年第3期171-186,共16页
This study presents the elaboration of a simple and cheap electrode made by carbon paste introduced into a cavity of electrode body, and used for the lead traces determination in tap water. A potentiostatic pre-electr... This study presents the elaboration of a simple and cheap electrode made by carbon paste introduced into a cavity of electrode body, and used for the lead traces determination in tap water. A potentiostatic pre-electrolysis at constant voltage enables the reduction of the lead (Pb2+) and the accumulation of the metallic lead at and into the carbon paste;the reoxidation of the Pb (Linear sweep voltammetry) leads to the anodic striping peak. The effect of the main operating parameters on the shape of the peak and the magnitude of the current was examined and their optimal values were determined. Then calibration was achieved and the method was successfully applied (using all the optimized parameters) to the determination of lead in water, with a detection limit of 0.138 μg·L-1. Compared to other methods (ICP-AES for example), the proposed method offers a satisfactory detection limit of the Pb2+ (0.138 μg·L-1) because of the important specific area of the carbon paste electrode, for a significantly lower cost. Besides, there is no observed loss in the electrode answer in terms of peak current, which means that there is no any irreversible steps nor deactivation of the electrode, even after ten successive measurements;only reduction of the lead followed by the deposit oxidation was observed at the electrode. 展开更多
关键词 carbon paste electrode LEAD LINEAR SWEEP anodic STRIPPING voltammetry WATER
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Trace Determination of Scandium Using Adsorption Voltammetry of Mix-Polynuclear Complex of Scandium-Calcium-Alizarin Red S at Carbon Paste Electrode 被引量:8
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作者 黎拒难 张军 +1 位作者 邓培红 费俊杰 《Journal of Rare Earths》 SCIE EI CAS CSCD 2004年第5期618-622,共5页
A novel method was described for the determination of ultra trace amount of scandium based on the cathodic adsorptive voltammetry of the mix-polynuclear complex of scandium-calcium-alizarin red S at a carbon paste ele... A novel method was described for the determination of ultra trace amount of scandium based on the cathodic adsorptive voltammetry of the mix-polynuclear complex of scandium-calcium-alizarin red S at a carbon paste electrode (CPE). The 2nd-order derivative linear scan voltammograms of the adsorbed complex were recorded by model JP-303 polarographic analyzer from 0.0 to -1.0 V (vs. SCE). The experimental conditions of the working procedure were optimized. The results show that the complex can be adsorbed on the surface of the CPE, yielding one peak at -0.61 V, corresponding to the reduction of the alizarin red S in the mix-polynuclear complex at the electrode. The detection limit of Sc^(3+) is 1.0×10^(-10) mol·L^(-1) for 3 min of accumulation time. The procedure was successfully applied to the determination of trace amount of scandium in the sample ores. 展开更多
关键词 analytic chemistry adsorption voltammetry carbon paste electrode SCANDIUM mix-polynuclear complex rare earths
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Anodic Stripping Voltammetric Determination of Nitrite Using Carbon Paste Electrode Modified with Chitosan
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作者 Ibrahim H. I. Habib 《American Journal of Analytical Chemistry》 2011年第2期284-288,共5页
A simple method for anodic stripping voltammetric determination of nitrite using carbon paste electrode modified with biomolecular chitosan, is described. In this method, the electrode is activated electrochemically b... A simple method for anodic stripping voltammetric determination of nitrite using carbon paste electrode modified with biomolecular chitosan, is described. In this method, the electrode is activated electrochemically by scanning 5 replicates over the potential range from +500 to +1400 mV immersing in 0.5 M HCl solution. Following this step, the nitrite sample containing 0.1 M KCl is preconcentrated on the activated electrode at +500 mV for 30 s. The deposited anions are then oxidized by different modes of sweep in the oxidation direction. Chemical and electrical parameters affecting the voltammetric measurements are optimized. The peak current is linear proportional to the NO2- concentration within the range 0.41 - 4.1 μg/ml, with detection limit 0.187 μg/m using differential pulse mode. The relative standard deviation is 0.285% for 2.46 μg/ml (five replicates). No interference is observed due to oxygen dissolved in the sample so that nitrogen purging is not needed in this case. The result obtained by the modified electrode is more accurate and selective than the unmodified electrode. 展开更多
关键词 CHITOSAN carbon paste electrode NITRITE anodic STRIPPING voltammetry
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Trace determination of zirconium using anodic adsorptive voltammetry at a carbon paste electrode modified with multi-walled carbon nanotubes
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作者 DENG PeiHong FEI JunJie +1 位作者 ZHANG Jun LI JuNan 《Chinese Science Bulletin》 SCIE EI CAS 2008年第11期1665-1670,共6页
A carbon paste electrode modified with multi-walled carbon nanotubes (MWCNT) was prepared and the determination of ultra trace amount of zirconium based on the anodic adsorptive voltammetry of the zirconium-calcium-al... A carbon paste electrode modified with multi-walled carbon nanotubes (MWCNT) was prepared and the determination of ultra trace amount of zirconium based on the anodic adsorptive voltammetry of the zirconium-calcium-alizarin red S mix-polynuclear complex is described in this paper for the first time. The results showed that the sensitivity and the selectivity of the method are excellent. The second de-rivative linear scan voltammograms of the complex were recorded by polarographic analyzer from 200 to 1200 mV (vs. SCE) and it was found that the complex can be adsorbed on the surface of the electrode, yielding a peak at about 840 mV, corresponding to the oxidation of ARS in the complex. The peak cur-rent increases linearly with Zr (IV) concentration in the range of 6.0×10-12―6.0×10-11 mol·L-1 (accumu-lation time 120 s), 6.0×10-11―2.0×10-9 mol·L-1 (accumulation time 90 s) and 2.0×10-9―1.0×10-7 mol·L-1 (accumulation time 60 s) and the detection limit (S/N = 3) is 2.0×10-12 mol·L-1 (accumulation time 180 s). The procedure has been successfully applied to the determination of zirconium in the ore samples. 展开更多
关键词 多壁碳纳米管 纳米技术 碳电极 阳极吸附伏安法
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Catalytic Adsorptive Stripping Voltammetry at a Carbon Paste Electrode for the Determination of Amiodarone
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作者 刘宁 高伟 宋俊峰 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2006年第11期1657-1661,共5页
Voltammetry using solid electrodes usually suffers from the contamination due to the deposition of the redox products of analytes on the electrode surface. The contamination has resulted in poor reproducibility and ov... Voltammetry using solid electrodes usually suffers from the contamination due to the deposition of the redox products of analytes on the electrode surface. The contamination has resulted in poor reproducibility and overelaborate operation procedures. The use of the chemical catalysis of oxidant on the reduction product of analyte not only can eliminate the contamination of analyte to solid electrodes but also can improve the faradaic response of analyte. This work introduced both the catalysis of oxidant K2S2O8 and the enhancement of surfactant Triton X-100 on the faraday response of amiodarone into an adsorptive stripping voltammetry at a carbon paste electrode for the determination of amiodarone. The method exhibits high sensitivity, good reproducibility and simple operation procedure. In 0.2 mol·L^-1 HOAc-NaOAc buffer (pH=5.3) containing 2.2×10^-2 mol·L^-1 K2S2O8 and 0.002% Triton X-100, the 2.5th-order derivative stripping peak current of the catalytic wave at 0.3 V (vs. Ag/AgCl) is rectilinear to amiodarone concentration in the range of 2.0×10^-10-2.3×10^-8 mol·L^-1 with a detection limit of 1.5×10^-10 mol·L^-1 after accumulation at 0 V for 30 s. 展开更多
关键词 AMIODARONE Triton X-100 peroxysulfate catalytic adsorptive stripping voltammetry carbon paste electrode
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Adsorptive Stripping Voltammetry of Ultra Trace Lanthanum(Ⅲ) Using an Alizarin S as Complexing Agent and Carbon Paste as Working Electrode
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作者 Muji Harsini Handoko Darmokoesomo Alien Kholifah 《Journal of Chemistry and Chemical Engineering》 2010年第9期61-64,共4页
Ultra trace determination of lantanum(Ⅲ) has been studied by adsorptive stripping voltammetry methods using an alizarin S as complexing agent and carbon paste electrode as working electrode. The electrode was made ... Ultra trace determination of lantanum(Ⅲ) has been studied by adsorptive stripping voltammetry methods using an alizarin S as complexing agent and carbon paste electrode as working electrode. The electrode was made from mixed of carbon powder and paraffin in micropipette tip with diameter of 4 ram. This method consists of two steps. The first step is the formation and adsorptive accumulation of metal ion with chelator at the electrode surface. The second step is stripping the complex from the electrode surface into the solution. The stripping step generates current which is recorded as voltammogram. The optimum conditions of instrumental parameter obtained were accumulation potential of 600 mV, accumulation time of 120 seconds, and pH of solution of 5.5. In this research, the limit detection obtained was 2.3348 × 10^-12 M (3.24× 10^-11μg/L) with sensitivity of 16.52 (nA/10u M) and the precision of standard solution of La3+ with concentration of 2 × 10^-12 M, 4× 10^-12 M, 6 × 10^-12 M, 8 × 10^-12 M, and 10 × 10^-12M were 3.50%, 9.88%, 7.19%, 7.48% and 1.85% respectively. The linierity of this method is very good with correlation coefficient is 0.9780. Recovery percentage from La3+ with concentration of 6× 10^-12 M and 10 × 10^-12 M are 108.84% and 91.51%, respectively. 展开更多
关键词 Ultra trace analysis lanthanum(Ⅲ) alizarin S adsorptive stripping voltammetry carbon paste electrode.
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Study on the adsorptive catalytic voltammetry of aloe-emodin at a carbon paste electrode 被引量:1
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作者 LI Ju'nan GAO Peng LI Xiangling YAN Zhihong MAO Xun 《Science China Chemistry》 SCIE EI CAS 2005年第5期442-448,共7页
A new catalytic voltammetric method for the determination of anthraqunone medi-cines at a carbon paste electrode (CPE) was described for the first time. The mechanism of the catalytic reaction was investigated by usin... A new catalytic voltammetric method for the determination of anthraqunone medi-cines at a carbon paste electrode (CPE) was described for the first time. The mechanism of the catalytic reaction was investigated by using linear sweep voltammetry, cyclic voltammetry, con-stant potential electrolysis and so on. The experiment results indicate that aloe-emodin was effi-ciently accumulated at a CPE by adsorption. In the following potential scan, aloe-emodin was reduced to homologous anthrahydroquinone compound, then the compound was immediately oxidized to aloe-emodin by the dissolved oxygen, and the aloe-emodin was again reduced at the CPE. As a result, a cyclic catalytic reaction was established. But a reversible redox reaction of aloe-emodin can only be observed at a mercury electrode, no catalytic reaction occurs there. A sensitive catalytic voltammetric peak of aloe-emodin was obtained at about ?0.60 V (vs. SCE) in 0.56 mol/L NH3-NH4Cl buffer (pH 8.9). The proposed method was applied to the determination of aloe-emodin in the Radix Rhei with satisfactory results. The determination results were in good agreement with reference values obtained by the HPLC. The adsorptive catalytic voltammetry for the determination of organic compound at CPE, chemically modified electrode and other solid electrodes could be significant in the studies on pharmacology, pharmacodynamics, toxicity of medicine, clinical medicine and biochemistry. 展开更多
关键词 aloe-emodin adsorptive CATALYTIC voltammetry carbon paste electrode.
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碳糊电极阳极吸附伏安法测定氧氟沙星 被引量:24
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作者 高朋 石谨 +1 位作者 黎拒难 刘述梅 《应用化学》 CAS CSCD 北大核心 2005年第5期578-580,共3页
A highly selective and rapid anodic adsorptive voltammetric method was developed for the (determination) of ultra trace amount of ofloxacin at a carbon paste electrode(CPE). The ofloxacin adsorbed on the surface o... A highly selective and rapid anodic adsorptive voltammetric method was developed for the (determination) of ultra trace amount of ofloxacin at a carbon paste electrode(CPE). The ofloxacin adsorbed on the surface of the CPE in a 0.096 mol/L KHP-NaOH buffer solution(pH=5.6) could produce one oxidation peak at 0.92 V(vs.SCE) when scanning was performed from 0.4 to 1.4 V. The relationship between the peak current and the ofloxacin concentration was linear in the ranges of 5.5×10-9~5.5×10-8 mol/L(75 s accumulation) and 3.3×10-8~3.3×10-7 mol/L(30 s accumulation). The correlation coefficients were 0.996 and 0.998, respectively. Its detection limit was 9.0×10-10 mol/L(S/N=3) for 150 s accumulation. The (electrode) reaction mechanism of ofloxacin was investigated. The proposed method was applied to analyze trace ofloxacin in urine samples. The result was in good agreement with that obtained by spectrophotometry (determination). 展开更多
关键词 氧氟沙星 阳极吸附伏安法 碳糊电极
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茜素紫修饰碳糊电极阳极溶出伏安法测定痕量锡 被引量:10
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作者 谢红旗 李益恒 +2 位作者 周方钦 郭会时 易兵 《分析化学》 SCIE EI CAS CSCD 北大核心 2001年第7期822-824,共3页
研究了利用茜素紫修饰碳糊电极测定痕量锡的阳极溶出伏安法。在 0 1 5mol/L醋酸盐缓冲溶液 (pH 4 .8)中 ,通过开路富集 ,Sn 和茜素紫形成络合物富集于电极表面 ,然后经过介质交换至 3 0mol/L的盐酸溶液中 ,于 -0 .80V还原后再进行阳... 研究了利用茜素紫修饰碳糊电极测定痕量锡的阳极溶出伏安法。在 0 1 5mol/L醋酸盐缓冲溶液 (pH 4 .8)中 ,通过开路富集 ,Sn 和茜素紫形成络合物富集于电极表面 ,然后经过介质交换至 3 0mol/L的盐酸溶液中 ,于 -0 .80V还原后再进行阳极化扫描 ,于 -0 .68V左右获得一灵敏的锡的溶出峰。二次导数峰电流与Sn 浓度在 8.4× 1 0 -9~ 1 .4× 1 0 -6mol/L范围内呈良好的线性关系。检出限达 4×1 0 -9mol/L ,同时对电极反应机理进行了讨论。 展开更多
关键词 茜素紫 碳糊修饰电极 吸附伏安法 测定 罐头食品 阳极溶出伏安法 痕量分析
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甲壳素修饰碳糊电极测定亚硝酸根 被引量:19
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作者 兰雁华 陆光汉 +3 位作者 吴晓刚 姚胜来 宋丰 许汉英 《分析试验室》 CAS CSCD 1999年第1期27-30,共4页
报道了一种对NO-2具有高灵敏度和选择性的碳糊化学修饰电极。该电极由碳粉中加入修饰剂甲壳素制备而成。采用酸性Briton-Robinson广泛缓冲溶液(pH3.90)为支持电解质,用1.2×10-4mol/L十六... 报道了一种对NO-2具有高灵敏度和选择性的碳糊化学修饰电极。该电极由碳粉中加入修饰剂甲壳素制备而成。采用酸性Briton-Robinson广泛缓冲溶液(pH3.90)为支持电解质,用1.2×10-4mol/L十六烷基三甲基溴化铵(CTMAB)作吸附剂,对亚硝酸根离子进行阳极溶出伏安法测定,检测限为1.0×10-9mol/L。在量浓度为2.0×10-9~2.0×10-7mol/L范围内,峰电流与浓度具有线性关系。此修饰电极可直接富集和测定水样中亚硝酸根的含量,大多数离子对测定无干扰,回收率为96.0%~110.0%。 展开更多
关键词 亚硝酸根 化学修饰 碳糊电极 伏安法 测定
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奥美拉唑在碳糊电极上的吸附伏安测定法研究 被引量:10
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作者 金根娣 胡效亚 +1 位作者 冷宗周 姚成 《分析测试学报》 CAS CSCD 北大核心 2003年第4期73-76,共4页
研究了奥美拉唑在碳糊电极上的电化学行为及检测方法 ;在1.2mol·L -1H2SO4 底液中 ,通过富集用碳糊电极吸附伏安法测定奥美拉唑 ;阴极峰电位为0.403V(vsSCE) ,峰电流与奥美拉唑的浓度在7.8×10-8~3.7×10-5 mol·L-1... 研究了奥美拉唑在碳糊电极上的电化学行为及检测方法 ;在1.2mol·L -1H2SO4 底液中 ,通过富集用碳糊电极吸附伏安法测定奥美拉唑 ;阴极峰电位为0.403V(vsSCE) ,峰电流与奥美拉唑的浓度在7.8×10-8~3.7×10-5 mol·L-1 范围内呈良好的线性关系 ;该法的检出限为1.43×10-8 mol·L-1;用标准加入法测得回收率范围为94 %~102 % ;对奥美拉唑胶囊用该法进行了测定 ,获得了满意的结果 ;该法的优点是成本低 ,操作方便 ,重复性好及检出限较低 ;对电极响应机理进行了探讨 。 展开更多
关键词 奥美拉唑 碳糊电极 吸附伏安法 测定 电化学行为 胃酸 十二指肠溃疡 胃溃疡 反流性食管炎 治疗
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羧基化碳纳米管修饰碳糊电极伏安法测定痕量锌 被引量:12
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作者 李俊华 许志锋 +2 位作者 曾荣英 屈景年 陈晓东 《冶金分析》 CAS CSCD 北大核心 2008年第11期7-11,共5页
基于羧基化多壁碳纳米管(c—MWCNT)修饰碳糊电极为工作电极,建立了无汞和高灵敏测定痕量锌的新方法。在0.1mol/LKCl电解液(pH6.7)中,当Zn^2+在羧基化多壁碳纳米管修饰碳糊电极表面富集100S,电位扫速为300mV/s时,该修饰电... 基于羧基化多壁碳纳米管(c—MWCNT)修饰碳糊电极为工作电极,建立了无汞和高灵敏测定痕量锌的新方法。在0.1mol/LKCl电解液(pH6.7)中,当Zn^2+在羧基化多壁碳纳米管修饰碳糊电极表面富集100S,电位扫速为300mV/s时,该修饰电极在阳极溶出伏安图上能出现一灵敏的溶出峰,峰电位约为-0.98V,利用该峰可以进行痕量锌的检测。峰电流与Zn^2+浓度在1.0×10^-11~1.0×10^-9mol/L和1.5×10^-9~3.0×10^-8mol/L的范围内成良好线性关系,其相关系数均为0.997,检出限可达1.0×10^-13mol/L。修饰电极稳定性较好,用于管网水样中锌含量的测定,回收率在97.7%~102.6%。同时循环伏安(CV)和交流阻抗(EIS)实验表明,锌在修饰电极上电化学反应是一准可逆过程,其电极过程的平均活化能是48.51kJ/mol。 展开更多
关键词 碳糊电极 碳纳米管 阳极溶出伏安法
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槲皮素化学修饰碳糊电极吸附溶出伏安法测定痕量铅 被引量:18
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作者 费俊杰 黎拒难 易芬云 《分析化学》 SCIE EI CAS CSCD 北大核心 2001年第8期916-918,共3页
建立了用槲皮素修饰碳糊电极测定痕量铅的新方法 ,在 0 .1 0mol L甲酸盐缓冲液 (pH 4.3 )中 ,于 -0 .1 0V(vs.SCE)搅拌富集 ,再在 -0 .70V静止还原 40s后 ,阳极化扫描 ,于 -0 .42V左右获得一灵敏的铅阳极溶出峰。在最佳条件下 ,富集不... 建立了用槲皮素修饰碳糊电极测定痕量铅的新方法 ,在 0 .1 0mol L甲酸盐缓冲液 (pH 4.3 )中 ,于 -0 .1 0V(vs.SCE)搅拌富集 ,再在 -0 .70V静止还原 40s后 ,阳极化扫描 ,于 -0 .42V左右获得一灵敏的铅阳极溶出峰。在最佳条件下 ,富集不同时间 ,其二次导数峰电流与Pb2 + 在 1 .0× 1 0 - 8~ 8.0× 1 0 - 7mol L和 2 .0× 1 0 - 9~ 6.0× 1 0 - 8mol L两个范围内呈线性关系 ,检出限为 8.0× 1 0 - 1 0 mol L(S N =3 )。同时初步探讨了电极反应机理。 展开更多
关键词 槲皮素 化学修饰碳糊电极 吸附溶出伏安法 痕量分析 测定
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钯(Ⅱ)-丁二酮肟络合物在碳糊电极上的阳极吸附伏安法研究 被引量:7
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作者 黎拒难 严志红 +2 位作者 颜飞艳 费俊杰 易兰花 《冶金分析》 EI CAS CSCD 北大核心 2007年第10期23-26,共4页
报道了在碳糊电极上络合吸附阳极伏安法测定钯的新方法。在PH4.2的HAc-NaAc缓冲溶液中,钯(Ⅱ)与丁二酮肟(DMG)形成的络合物在0.20V(vs.SCE)搅拌富集60s,静止10S,然后在0.20~1.20V范围内以300mV/s的扫描速度线性扫描,在0... 报道了在碳糊电极上络合吸附阳极伏安法测定钯的新方法。在PH4.2的HAc-NaAc缓冲溶液中,钯(Ⅱ)与丁二酮肟(DMG)形成的络合物在0.20V(vs.SCE)搅拌富集60s,静止10S,然后在0.20~1.20V范围内以300mV/s的扫描速度线性扫描,在0.90V处产生灵敏的阳极吸附伏安峰。其二阶导数峰电流与钯(Ⅱ)的浓度在3.0×10~~8.0×10^-7mol/L范围内呈线性关系,富集120s,检出限达5.0×10^-10mol/L。本方法应用于催化剂中钯的测定,相对标准偏差为3.6%~4.7%,加标回收率在94%以上,结果与火焰原子吸收光谱法测定结果一致。 展开更多
关键词 丁二酮肟 阳极吸附伏安法 碳糊电极
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盐酸氨溴索在碳糊电极上阳极伏安法的研究 被引量:5
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作者 金根娣 胡效亚 +1 位作者 冷宗周 姚成 《分析化学》 SCIE EI CAS CSCD 北大核心 2002年第2期214-217,共4页
在0.5 mol/L H2SO4底液中,用碳糊电极阳极伏安法测定盐酸氨溴索,被测的阳极峰电位为1.10V(vs.SCE),另外,在0.46V处还产生一对可逆的氧化还原峰。1.10 V处的峰电流与盐酸氨溴索的浓度在3.98... 在0.5 mol/L H2SO4底液中,用碳糊电极阳极伏安法测定盐酸氨溴索,被测的阳极峰电位为1.10V(vs.SCE),另外,在0.46V处还产生一对可逆的氧化还原峰。1.10 V处的峰电流与盐酸氨溴索的浓度在3.98×10^(-7)~6.34 × 10^(-5)mol/L范围内呈良好的线性关系,该方法的检出下限为3.0 × 10^(-8)mol/L。用标准加入法测得回收率范围为92.8%~102%,RSD为2.9%(n=10)。对电极响应机理进行了初步探讨,氨溴索在1.10 V处的氧化为不可逆过程,其氧化产物在0.460V处产生一对2电子2质子受扩散控制的可逆波,用该波也可进行定量测定并且干扰较少,但灵敏度略低。 展开更多
关键词 盐酸氨溴索 碳糊电极 阳极伏安法 止咳化痰药 分析 电化学行为
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痕量多巴酚丁胺在碳糊电极上的吸附伏安行为及其痕量测定的研究 被引量:7
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作者 杨功俊 金利通 +1 位作者 冷宗周 陈文建 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 1998年第10期1574-1577,共4页
在0.1mol/LH2SO4底液中,用碳糊电极吸附伏安法测定多巴酚丁胺,阳极峰电位为0.46V(vs.SCE),峰电流与多巴酚丁胺的浓度在3.0×10-9~1.0×10-6mol/L范围内呈良好的线性关系.该... 在0.1mol/LH2SO4底液中,用碳糊电极吸附伏安法测定多巴酚丁胺,阳极峰电位为0.46V(vs.SCE),峰电流与多巴酚丁胺的浓度在3.0×10-9~1.0×10-6mol/L范围内呈良好的线性关系.该法检测下限为1.5×10-9mol/L,回收范围为94.00%~102.59%,相对标准偏差为3.1%(n=9).本文还对反应机理进行了初步探讨. 展开更多
关键词 多巴酚丁胺 碳糊电极 吸附伏安法 分析
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碳糊电极阳极吸附伏安法测定大黄酸 被引量:13
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作者 严志红 黎拒难 +1 位作者 高朋 毛勋 《分析科学学报》 CAS CSCD 2005年第4期420-422,共3页
在pH 4.2的HAc-NaAc底液中,大黄酸在碳糊电极(CPE)上有一灵敏的吸附氧化峰,峰电位为1.14 V(vs.SCE).该氧化峰的二阶导数峰电流与大黄酸的浓度在8.0×10-9~8.0×10-7 mol/L (富集120 s) 范围内呈良好的线性关系(r=0.998),检出限... 在pH 4.2的HAc-NaAc底液中,大黄酸在碳糊电极(CPE)上有一灵敏的吸附氧化峰,峰电位为1.14 V(vs.SCE).该氧化峰的二阶导数峰电流与大黄酸的浓度在8.0×10-9~8.0×10-7 mol/L (富集120 s) 范围内呈良好的线性关系(r=0.998),检出限为2×10-9 mol/L(S/N=3,富集180 s).探讨了大黄酸在CPE上的伏安性质和电极反应机理,并将本法应用于中药大黄中的大黄酸的测定,结果良好. 展开更多
关键词 大黄酸 碳糊电极 吸附伏安法
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锆(Ⅳ)-邻苯二酚紫络合物碳糊电极阳极吸附伏安法研究 被引量:5
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作者 毛勋 黎拒难 +2 位作者 丁永兰 严志红 高朋 《分析测试学报》 CAS CSCD 北大核心 2005年第3期34-36,40,共4页
研究了锆(Ⅳ)-邻苯二酚紫(PV)络合物在碳糊电极上的吸附伏安行为。测定锆最佳条件为:0.08mol/L的HNO3为底液,于0.4V富集50s,从0.4至1.4V以100mV/s的速率线性扫描。在0.85V(vs.SCE)的二次导数氧化峰电流与锆的浓度在3.0×10-9~5.0&#... 研究了锆(Ⅳ)-邻苯二酚紫(PV)络合物在碳糊电极上的吸附伏安行为。测定锆最佳条件为:0.08mol/L的HNO3为底液,于0.4V富集50s,从0.4至1.4V以100mV/s的速率线性扫描。在0.85V(vs.SCE)的二次导数氧化峰电流与锆的浓度在3.0×10-9~5.0×10-8mol/L(5.6×10-7mol/LPV)和1.0×10-8~1.0×10-7mol/L(5.6×10-6mol/LPV)成线性关系。富集80s,检出限为1.0×10-9mol/L(S/N=3)。该法用于标准岩石样品中锆的测定,不需萃取分离和掩蔽,直接测定,结果满意。铪(Ⅳ)在同样的实验条件下也于0.85V产生一络合吸附峰,灵敏度稍低于锆。 展开更多
关键词 邻苯二酚紫 碳糊电极 阳极吸附伏安法
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