期刊文献+
共找到248篇文章
< 1 2 13 >
每页显示 20 50 100
Square Wave Voltammetry for Analytical Determination of Cadmium in Natural Water Using Ca10(PO4)6(OH)2-Modified Platinum Electrode 被引量:2
1
作者 Moulay Abderrahim El Mhammedi Mounia Achak Mina Bakasse 《American Journal of Analytical Chemistry》 2010年第3期150-158,共9页
This paper reports on the development of a novel electrochemical assay for cadmium (II) in natural water, which involves the use of disposable hydroxyapatite modified platinum electrode (HAP/Pt). Cadmium (II) was prec... This paper reports on the development of a novel electrochemical assay for cadmium (II) in natural water, which involves the use of disposable hydroxyapatite modified platinum electrode (HAP/Pt). Cadmium (II) was preconcentrated on the surface of the modified electrode and adsorbed onto HAP and oxidized at E = –680 mV. The HAP-modified platinum electrode exhibited superior performance in comparison to the plati- num electrode and surprisingly, yielded a higher electrochemical response. The best defined anodic peak was obtained with 0.2 mol L-1 KNO3 pH 5.0 after 25 min of accumulation time. Using these conditions, the cali- bration plot was linear over the range 1 × 10?8 to 5 × 10?6 mol L-1 Cd2+. The precision was examined by car- rying out eight replicate measurements at a concentration of 2.5 ×10?5 mol L-1;the coefficient of variation was 2.9%. The method was applied to the determination of the analyte in river water samples. The interfere- ence of other metal ions on the voltammetric response of Cd(II) was studied. The HAP films was clearly ob- served in the SEM images and characterized by X-ray diffraction, IR spectroscopy and chemical analysis. 展开更多
关键词 HYDROXYAPATITE CADMIUM PLATINUM Electrode square wave voltammetry
下载PDF
Osteryoung square wave voltammetric determination of lactose in food samples by a derivative procedure
2
作者 Yong Nian Ni Yue Rong Wang Serge Kokot 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第12期1491-1494,共4页
A method for determination of lactose in food samples by Osteryoung square wave voltammetry (OSWV) was developed. It was based on the nucleophilic addition reaction between lactose and aqua ammonia. The carbonyl gro... A method for determination of lactose in food samples by Osteryoung square wave voltammetry (OSWV) was developed. It was based on the nucleophilic addition reaction between lactose and aqua ammonia. The carbonyl group of lactose can be changed into imido group, and this increases the electrochemical activity in reduction and the sensitivity. The optimal condition for the nucleophilic addition reaction was investigated and it was found that in NH4C1-NH3 buffer of pH 10.1, the linear range between the peak current and the concentration of lactose was 0.6-8.4 mg L-l, and the detection limits was 0.44 mg L- 1. The proposed method was applied to the 'determination of lactose in food samples and satisfactory results were obtained. 展开更多
关键词 Osteryoung square wave voltammetry LACTOSE FOOD MILK
下载PDF
Determination of ziram in vegetable samples by square wave voltammetry
3
作者 Ping Qiu Yong Nian Ni 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第11期1337-1340,共4页
The electrochemical behaviour and electrode reaction mechanism of ziram (zinc-dimethyl dithiocarbamate) on a hanging mercury drop electrode were investigated in Britton-Robinson (B-R) buffer by using cyclic and sq... The electrochemical behaviour and electrode reaction mechanism of ziram (zinc-dimethyl dithiocarbamate) on a hanging mercury drop electrode were investigated in Britton-Robinson (B-R) buffer by using cyclic and square wave voltammetry (SWV). Based on these studies a voltammetric method for determination of ziram wasdeveloped and applied to determine the ziram in synthetic and spiked vegetable samples, satisfactory results were obtained in both cases. 展开更多
关键词 ZIRAM square wave voltammetry PESTICIDE
下载PDF
基于刃天青的电化学方波伏安法快速鉴别大肠杆菌的耐药性
4
作者 戚楚楚 卢礼生 +3 位作者 任佳丽 周凯 张馨方 张紫莺 《食品与机械》 CSCD 北大核心 2024年第4期47-53,共7页
目的:评价5株食源性大肠杆菌临床分离株对环丙沙星、庆大霉素和氨苄西林的抗生素耐药性。方法:基于细菌能量代谢过程中的电子传递理论,引入刃天青作为氧化还原探针,建立了一种基于刃天青介导的大肠杆菌耐药性快速鉴别的电化学方波伏安法... 目的:评价5株食源性大肠杆菌临床分离株对环丙沙星、庆大霉素和氨苄西林的抗生素耐药性。方法:基于细菌能量代谢过程中的电子传递理论,引入刃天青作为氧化还原探针,建立了一种基于刃天青介导的大肠杆菌耐药性快速鉴别的电化学方波伏安法(square wave voltammetry,SWV)。结果:在1.69×10^(2)~1.69×10^(8)CFU/mL范围内,大肠杆菌浓度与刃天青氧化峰电流(I)之间存在较好的线性关系,回归方程为Y=-0.1560 X-2.9655,R^(2)=0.9775;在进行大肠杆菌耐药性测定时,参考美国临床和实验室标准协会制定的药敏试验标准,以刃天青的氧化峰电流(I_(0))和大肠杆菌直接与刃天青作用后得到的氧化峰电流(I_(-a))作为对照,测定大肠杆菌用抗生素处理后与刃天青作用得到氧化峰电流(I_(+a)),引入细菌活性值V_(ETA)作为电化学方波伏安法鉴别细菌耐药性的指标,建立了刃天青介导的大肠杆菌电化学快速药敏试验方法;运用建立的方法检测了5种食源性大肠杆菌临床分离株对3种抗生素的耐药性,以V ETA=50作为判断细菌敏感和耐药的临界值,均得到与纸片扩散法结果相符的药敏试验结果,而纸片扩散法报告结果需18 h,该法仅需2 h。结论:建立的基于刃天青介导的大肠杆菌耐药性快速鉴别的电化学方波伏安法能够准确且快速检测5株食源性大肠杆菌临床分离株对环丙沙星、庆大霉素和氨苄西林的抗生素耐药性。 展开更多
关键词 大肠杆菌 耐药性 快速检测 刃天青 电子传递链 方波伏安法
下载PDF
现代方波伏安法(SWV)测定辉长石中微量钒的研究 被引量:1
5
作者 李正宇 张慧萍 《云南师范大学学报(自然科学版)》 1998年第1期74-77,共4页
本文使用美国PAR公司EGΣG384B多功能极谱仪建立了SWV法测定辉长石中微量钒的方法。Na2O2溶样、水浸溶块、HAc-NaAc体系,起始电位-0.50V,终止电位-1.50V,钒峰电位-1.04V,灵敏度比经典... 本文使用美国PAR公司EGΣG384B多功能极谱仪建立了SWV法测定辉长石中微量钒的方法。Na2O2溶样、水浸溶块、HAc-NaAc体系,起始电位-0.50V,终止电位-1.50V,钒峰电位-1.04V,灵敏度比经典极谱法提高2个数量级,在所选测定体系条件下,钒峰高随浓度增大而明显增高,且峰电位再现性好、峰形稳定,并用该法对实际样品测定,效果满意。 展开更多
关键词 方波伏安法 微量元素 辉长石 测定
下载PDF
基于氮掺杂介孔碳修饰玻碳微球糊电极的双酚A电化学传感器的构建及性能研究
6
作者 贺嘉夫茹孜 马伟平 李永红 《广州化工》 CAS 2024年第14期35-38,81,共5页
制备了一种由氮掺杂介孔碳修饰的玻碳微球糊电极,用于双酚A的灵敏、快速检测。利用循环伏安法对修饰电极进行了表征,采用方波伏安法研究了双酚A在修饰电极上的电化学行为;根据不同扫速下峰电流与扫速的关系讨论了双酚A在电极表面的反应... 制备了一种由氮掺杂介孔碳修饰的玻碳微球糊电极,用于双酚A的灵敏、快速检测。利用循环伏安法对修饰电极进行了表征,采用方波伏安法研究了双酚A在修饰电极上的电化学行为;根据不同扫速下峰电流与扫速的关系讨论了双酚A在电极表面的反应过程。在最优的实验条件下,双酚A的响应电流与浓度在0.3~2μM和2~30μM范围内时呈线性关系,检测限是0.01μM(S/N=3)。该方法具有良好的重现性和抗干扰性,可用于实际样品的检测,样品回收率为97.5%~101.5%。 展开更多
关键词 双酚A 氮掺杂介孔碳 玻碳微球糊电极 方波伏安法 循环伏安法 电化学传感器
下载PDF
多巴胺在FcA/Nafion/GCE上的电化学行为及其SWV测定应用
7
作者 马艳蓉 高作宁 《宁夏大学学报(自然科学版)》 CAS 北大核心 2007年第1期45-48,共4页
研究了多巴胺(Dopamine,DA)在二茂铁乙酸(Ferrocenyl Acetic Acid,FcA)和Nation聚合物薄膜修饰玻碳电极(FcA/Nation/GCE)上的电化学行为,测定了DA在该修饰电极上的动力学参数,并用方波伏安法(SWV)对DA在FcA/Nation/GCE... 研究了多巴胺(Dopamine,DA)在二茂铁乙酸(Ferrocenyl Acetic Acid,FcA)和Nation聚合物薄膜修饰玻碳电极(FcA/Nation/GCE)上的电化学行为,测定了DA在该修饰电极上的动力学参数,并用方波伏安法(SWV)对DA在FcA/Nation/GCE上的测定应用进行了研究.结果表明,与GCE相比,DA在FcA/Nation/GCE上的峰电流增大约10倍,氧化峰电位负移60mV,表明FcA/Nation/GCE对DA有良好的电化学催化作用;同时测得DA在FcA/Nation/GCE上的电子转移系数口为0.44,反应速率常数k。为0.106cm/s,表观扩散系数D0为5.4×10^-6cm^2/s.用SwV方法测得DA浓度在1.0×10^-5~2.0×10^-3mol/L范围内氧化峰电流(Jpa)与其呈良好的线性关系,线性拟舍方程为Jpa(μA)=47.524+16.508c(10mol/L),相关系数R=0.9989,检出限为1.0×10^-6mol/L,相对标准偏差为0.9%~1.1%,回收率为97.5%~100.1%.该测定方法简单快捷,测定结果令人满意. 展开更多
关键词 二茂铁乙酸 NATION 修饰电极 多巴胺 方波伏安法
下载PDF
基于Fe_(3)O_(4)-MoS_(2)-全氟磺酸纳米复合材料的铅离子电化学传感器
8
作者 刘鑫 刘士兴 +1 位作者 邵佳豪 胡海兵 《微纳电子技术》 CAS 2024年第9期65-73,共9页
采用Fe_(3)O_(4)-MoS_(2)-全氟磺酸复合材料修饰玻碳电极(GCE),基于电化学传感原理,使用阳极方波伏安法检测水中微量的铅离子。通过扫描电子显微镜(SEM)、能量色散X射线光谱仪(EDS)、Raman光谱分析仪和X射线光电子能谱仪(XPS)进行物理... 采用Fe_(3)O_(4)-MoS_(2)-全氟磺酸复合材料修饰玻碳电极(GCE),基于电化学传感原理,使用阳极方波伏安法检测水中微量的铅离子。通过扫描电子显微镜(SEM)、能量色散X射线光谱仪(EDS)、Raman光谱分析仪和X射线光电子能谱仪(XPS)进行物理表征。结果表明Fe_(3)O_(4)已较均匀地分布在MoS_(2)上。为了得到良好的实验效果,优化醋酸盐(Hac-NaAc)缓冲溶液的pH值为3.6,最佳沉积时间为120 s,最佳沉积电位为-0.6 V,在滴加5μL的Fe_(3)O_(4)-MoS_(2)和5μL的全氟磺酸条件下进行测试,实验结果表明在0.1~0.6μmol·L^(-1)铅离子浓度范围,Fe_(3)O_(4)-MoS_(2)-全氟磺酸-GCE传感器的线性度良好,灵敏度和检测限分别为25.05μA/(μmol·L^(-1))和0.11μmol·L^(-1)。该检测方法快速便捷,具有低成本、高效率和易操作的特点。 展开更多
关键词 电化学传感器 Fe_(3)O_(4)-MoS_(2)-全氟磺酸 方波伏安法 铅离子 重金属检测
下载PDF
Indirect Electroanalysis of 3-Methyl-4-Nitrophenol in Water Using Carbon Fiber Microelectrode Modified with Nickel Tetrasulfonated Phthalocyanine Complex
9
作者 Yibor Fabrice Roland Bako Serge Foukmeniok Mbokou +2 位作者 Boukaré Kaboré Issa Tapsoba Maxime Pontié 《Materials Sciences and Applications》 2024年第2期25-35,共11页
Electrochemical detection of 3-methyl-4-nitrophenol (MNP) in direct phenol oxidation occurs at high potentials and generally leads to progressive passivation of the electrochemical sensor. This study describes the use... Electrochemical detection of 3-methyl-4-nitrophenol (MNP) in direct phenol oxidation occurs at high potentials and generally leads to progressive passivation of the electrochemical sensor. This study describes the use of a carbon fiber microelectrode modified with a tetrasulfonated nickel phthalocyanine complex for the detection of MNP at a lower potential than that of direct phenol oxidation. The MNP voltammogram showed the presence of an anodic peak at -0.11 V vs SCE, corresponding to the oxidation of the hydroxylamine group generated after the reduction of the nitro group. The effect of buffer pH on the peak current and SWV parameters such as frequency, scan increment, and pulse amplitude were studied and optimized to have better electrochemical response of the proposed sensor. With these optimal parameters, the calibration curve shows that the peak current varied linearly as a function of MNP concentration, leading to a limit of detection (LoD) of 1.1 μg/L. These results show an appreciable sensitivity of the sensor for detecting the MNP at relatively low potentials, making it possible to avoid passivation phenomena. 展开更多
关键词 3-Methyl-4-Nitrophenol Carbon Fiber Microelectrode Nickel Tetrasulfonated Phthalocyanine Indirect Electroanalysis square wave voltammetry
下载PDF
CuO-nanoparticles modified carbon paste electrode for square wave voltammetric determination of lidocaine: Comparing classical and Box–Behnken optimization methodologies 被引量:3
10
作者 Nadereh Rahbar Zahra Ramezani Jamalaldin Ghanavati 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第6期837-842,共6页
In this research, copper oxide nanoparticles modified carbon paste electrode was developed for the voltammetric determination of lidocaine. The square wave voltammogram of lidocaine solution showed a well-defined peak... In this research, copper oxide nanoparticles modified carbon paste electrode was developed for the voltammetric determination of lidocaine. The square wave voltammogram of lidocaine solution showed a well-defined peak between +0.5 and +1.5 V. Instrumental and chemical parameters influencing voltammetric response were optimized by both one at a time and Box–Behnken model of response surface methodology. The results revealed that there was no significant difference between two methods of optimization. The linear range was 1–2500 μmol L^-1(Ip= 0.11 C(LH)+ 17.38, R^2= 0.999). The LOD and LOQ based on three and ten times of the signal to noise(S/N) were 0.39 and 1.3 μmol L^-1(n = 10),respectively. The precision of the method was assessed for 10 replicate square wave voltammetry(SWV)determinations each of 0.05, 0.5 and 1 μmol L^-1 of lidocaine showing relative standard deviations 4.1%,3.7% and 2.1%, respectively. The reliability of the proposed method was established by application of the method for the determination of lidocaine in two pharmaceutical preparations, namely injection and gel. 展开更多
关键词 square wave voltammetry CuO nanoparticles LIDOCAINE Modified carbon paste electrode
原文传递
Electrooxidation of sulfanilamide and its voltammetric determination in pharmaceutical formulation,human urine and serum on glassy carbon electrode 被引量:2
11
作者 Bruno R.L.Ferraz Tiago Guimaraes +1 位作者 Demetrius Profeti Luciene P.R.Profeti 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2018年第1期55-59,共5页
For the first time, sulfanilamide(SFD) was determined in otologic solution, human urine and serum by electroanalytical techniques on glassy carbon electrode(GCE). The cyclic voltammetry(CV) experiments showed an irrev... For the first time, sulfanilamide(SFD) was determined in otologic solution, human urine and serum by electroanalytical techniques on glassy carbon electrode(GCE). The cyclic voltammetry(CV) experiments showed an irreversible oxidation peak at t 1.06 V in 0.1 mol/L BRBS(p H ? 2.0) at 50 m V/s. Different voltammetric scan rates(from 10 to 250 m V/s) suggested that the oxidation of SFD on the GCE was a diffusioncontrolled process. Square-wave voltammetry(SWV) method under optimized conditions showed a linear response to SFD from 5.0 to 74.7 μmol/L(R ? 0.999) with detection and quantification limits of 0.92 and3.10 μmol/L, respectively. The developed SWV method showed better results for detection limit and linear range than the chronoamperometry method. It has been successfully applied to determine SFD concentration in pharmaceutical formulation, human urine and serum samples with recovery close to 100%. 展开更多
关键词 square-wave voltammetry SULFANILAMIDE GLASSY carbon electrode Biological FLUIDS
下载PDF
ADDITIVE SQUARE WAVE VOLTAMMETRY FOR COMPLEXING ADSORPTIVE CATALYTICAL SYSTEMS
12
作者 莫金垣 陈子昂 《Chinese Science Bulletin》 SCIE EI CAS 1991年第7期565-569,共5页
The voltammetry for complexing adsorptive catalytical systems (CACS) has high sensitivity due to the coexistence of the adsorptive reducing current and the catalytical current. However, no study has been made on the c... The voltammetry for complexing adsorptive catalytical systems (CACS) has high sensitivity due to the coexistence of the adsorptive reducing current and the catalytical current. However, no study has been made on the case in which square wave voltammetry is used. 展开更多
关键词 square wave voltammetry ADDITIVE square wave voltammetry COMPLEXING ADSORPTIVE catalytical voltammetry convolution voltammetry.
原文传递
Ac voltammetric and square wave voltammetric study of the self-assembled monolayers of thiol-functionalized viologen derivative
13
作者 Li, JH Yang, CH +2 位作者 Yan, JC Chen, WQ Dong, SJ 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1997年第2期130-137,共8页
Electroactive self-assembled monolayers (SAMs) containing viologen group are formed through the adsorption of thiol-functionalized viologen compound CH3(CH2)(9)V2+(CH2)(8)SH, where V2+ is N,N'-dialkylbipyridinium ... Electroactive self-assembled monolayers (SAMs) containing viologen group are formed through the adsorption of thiol-functionalized viologen compound CH3(CH2)(9)V2+(CH2)(8)SH, where V2+ is N,N'-dialkylbipyridinium (i.e. a viologen group), onto gold electrodes from methanol/water solution and its electrochemical behavior is investigated ty Ac voltammetry and square wave voltammetry, which have the high sensitivity against background charging. The viologen SAM formed is a sub-monolayer and the normal potentials corresponding to the two successive one-electron transfer processes of the active centers (viologen) are -360 mV and -750 mV (vs. Ag/AgCl) in 0.1 mol/L phosphate buffer solutions (pH 6.96) respectively, and the standard electron transfer rate constant is 9.0 s(-1). The electrochemical behavior of this SAM in various solutions has been preliminarily discussed. 展开更多
关键词 self-assembled monolayers VIOLOGEN Ac voltammetry square wave voltammetry
原文传递
基于三电极的便携式重金属离子检测仪研制与应用 被引量:1
14
作者 高鋆函 赵杰 +2 位作者 邓宇珩 袁剑英 崔国峰 《分析测试学报》 CAS CSCD 北大核心 2023年第9期1096-1103,共8页
该文研制了一种小型化重金属离子检测仪。该仪器具有高精度、稳定、便携等优点,能够精准输出-2.5~+2.5 V范围内的激励信号,通过调节8种不同的增益,可检测pA~mA范围内的电流,满足痕量重金属离子的检测需求。验证了检测仪的4项硬件参数性... 该文研制了一种小型化重金属离子检测仪。该仪器具有高精度、稳定、便携等优点,能够精准输出-2.5~+2.5 V范围内的激励信号,通过调节8种不同的增益,可检测pA~mA范围内的电流,满足痕量重金属离子的检测需求。验证了检测仪的4项硬件参数性能,包括:激励信号输出精度、恒电位电路的稳定性、微小电流检测的准确性以及整体伏安性能测试。电化学性能通过在铁氰化钾溶液中以不同扫描速率的循环伏安实验进行验证,得出峰值电流高度与扫描速率的平方根呈线性关系,相关系数(r^(2))均大于0.99。以未经修饰的丝网印刷金电极作为传感器,采用方波阳极溶出伏安法(SWASV)检测Pb^(2+),得到10~100μg/L质量浓度范围内的校准曲线,检出限达0.295μg/L,且重复性良好。通过与台式电化学分析设备Gamry Reference 600+进行比较,得到近乎一致的校准曲线,r^(2)分别为0.9989和0.9991,体现了所研制仪器的可靠性。该仪器在提供强大的检测性能和可靠性的同时,实现了低成本和便携性,可用于环境水体中重金属离子的现场检测。 展开更多
关键词 恒电位仪 电化学 重金属离子检测 方波阳极溶出伏安法 微电流检测
下载PDF
基于方波伏安法的聚多巴胺@纳米银修饰玻碳电极测定畜禽肉中氯丙嗪 被引量:1
15
作者 邹玉婷 段宁馨 +4 位作者 古飞燕 黄泓凯 赵晓娟 刘功良 罗忠润 《食品科学》 EI CAS CSCD 北大核心 2023年第4期292-299,共8页
基于多巴胺(dopamine,DA)的自聚反应,在纳米银(sliver nanoparticles,AgNPs)和玻碳电极(glassy carbon electrode,GCE)表面形成聚多巴胺(polydopamine,PDA)膜,使AgNPs均匀分散在GCE表面,得到PDA@AgNPs/GCE修饰电极;对DA的自聚时间、氯... 基于多巴胺(dopamine,DA)的自聚反应,在纳米银(sliver nanoparticles,AgNPs)和玻碳电极(glassy carbon electrode,GCE)表面形成聚多巴胺(polydopamine,PDA)膜,使AgNPs均匀分散在GCE表面,得到PDA@AgNPs/GCE修饰电极;对DA的自聚时间、氯丙嗪的电化学测试方法及条件等进行考察和优化,构建基于方波伏安法的氯丙嗪快速检测方法;利用循环伏安法、交流阻抗法和扫描电子显微镜对修饰电极进行表征。最佳条件下,氯丙嗪在PDA@AgNPs/GCE上的氧化峰电流与其浓度在5.0×10^(-8)~1.0×10^(-5)mol/L范围内呈良好的线性关系(R^(2)=0.991),检出限(R_(SN)=3)为1.7×10^(-8)mol/L。用该法测定猪肉、鸡肉和牛肉中氯丙嗪的加标回收率分别为84.9%~88.8%、79.8%~93.8%、80.6%~93.9%。该方法所用测试仪器轻巧便携,修饰电极的制备方法简便易行、成本低、便于批量制备,可用于畜禽肉中氯丙嗪的快速检测。 展开更多
关键词 氯丙嗪 方波伏安法 修饰电极 快速检测 畜禽肉
下载PDF
负载爆米花状铜粒子的植酸掺杂碳纳米管网络用于Hg(Ⅱ)的高灵敏检测 被引量:1
16
作者 冯通 钟佳妙 +2 位作者 陈开茶 赵红莉 蓝闽波 《华东理工大学学报(自然科学版)》 CAS CSCD 北大核心 2023年第6期809-817,共9页
Hg(Ⅱ)易于在生物体内积累,对人类健康和生态环境构成严重威胁,实现Hg(Ⅱ)的灵敏、快速且准确的检测至关重要。以逐步电沉积的方式,先后在丝网印刷碳电极表面修饰植酸掺杂的碳纳米管网络(PACNTnet)和爆米花状铜粒子(popCu),以构建Hg(Ⅱ... Hg(Ⅱ)易于在生物体内积累,对人类健康和生态环境构成严重威胁,实现Hg(Ⅱ)的灵敏、快速且准确的检测至关重要。以逐步电沉积的方式,先后在丝网印刷碳电极表面修饰植酸掺杂的碳纳米管网络(PACNTnet)和爆米花状铜粒子(popCu),以构建Hg(Ⅱ)电化学传感器。含有丰富含氧官能团和磷酸根的PACNTnet为Hg(Ⅱ)提供了大量的结合位点,而适量Cu(Ⅱ)与Hg(Ⅱ)之间的协同作用实现了电流信号的放大。因此,所制备的电化学传感器对于Hg(Ⅱ)的检测表现出良好的选择性、重现性和稳定性,在Hg(Ⅱ)质量浓度为0.02~2μg/L的线性范围内,传感器灵敏度高达5.51μA/(μg·L^(-1)),检测限低至0.012μg/L。此外,大米和茶叶样品的加标回收实验也获得了良好的回收率,证明了该传感器在实际样品中的应用潜力。 展开更多
关键词 方波阳极溶出伏安法 丝网印刷 碳电极 电化学传感器 Hg(Ⅱ)
下载PDF
An AuNPs/Mesoporous NiO/Nickel Foam Nanocomposite as a Miniaturized Electrode for Heavy Metal Detection in Groundwater 被引量:1
17
作者 Boyuan Xue Qian Yang +4 位作者 Kaidong Xia Zhihong Li George Y.Chen Dayi Zhang Xiaohong Zhou 《Engineering》 SCIE EI CAS CSCD 2023年第8期199-208,共10页
Heavy metals,notably Pb2+and Cu^(2+),are some of the most persistent contaminants found in groundwater.Frequent monitoring of these metals,which relies on efficient,sensitive,cost-effective,and reliable methods,is a n... Heavy metals,notably Pb2+and Cu^(2+),are some of the most persistent contaminants found in groundwater.Frequent monitoring of these metals,which relies on efficient,sensitive,cost-effective,and reliable methods,is a necessity.We present a nanocomposite-based miniaturized electrode for the concurrent measurement of Pb2+and Cu^(2+)by exploiting the electroanalytical technique of square wave voltammetry.We also propose a facile in situ hydrothermal calcination method to directly grow binder-free mesoporous Ni O on a three-dimensional nickel foam,which is then electrochemically seeded with gold nanoparticles(Au NPs).The meticulous design of a low-barrier Ohmic contact between mesoporous Ni O and Au NPs facilitates target-mediated nanochannel-confined electron transfer within mesoporous Ni O.As a result,the heavy metals Pb2+(0.020 mg.L^(-1)detection limit;2.0–16.0 mg.L^(-1)detection range)and Cu^(2+)(0.013 mg.L^(-1)detection limit;0.4–12.8 mg.L^(-1)detection range)can be detected simultaneously with high precision.Furthermore,other heavy metal ions and common interfering ions found in groundwater showed negligible impacts on the electrode’s performance,and the recovery rate of groundwater samples varied between 96.3%±2.1%and 109.4%±0.6%.The compactness,flexible shape,low power consumption,and ability to remotely operate our electrode pave the way for onsite detection of heavy metals in groundwater,thereby demonstrating the potential to revolutionize the field of environmental monitoring. 展开更多
关键词 AuNPs Mesoporous NiO Miniaturized electrode Heavy metal ions GROUNDWATER square wave voltammetry
下载PDF
基于多壁碳纳米管修饰电极的臭氧传感器研究
18
作者 晚豪 康天放 鲁理平 《化学研究与应用》 CAS 北大核心 2023年第11期2635-2642,共8页
本文将多壁碳纳米管(MWCNT)修饰到玻碳电极(GCE)界面,并基于臭氧(O_(3))与靛蓝三磺酸钾(ITS)的灵敏反应,间接实现了水中O_(3)的定量测定。利用扫描电镜和循环伏安法对该修饰电极进行了形貌和电化学性质表征。在最优实验条件下,溶液中IT... 本文将多壁碳纳米管(MWCNT)修饰到玻碳电极(GCE)界面,并基于臭氧(O_(3))与靛蓝三磺酸钾(ITS)的灵敏反应,间接实现了水中O_(3)的定量测定。利用扫描电镜和循环伏安法对该修饰电极进行了形貌和电化学性质表征。在最优实验条件下,溶液中ITS的方波伏安(SWV)峰电流在2.0×10^(-7)~6.4×10^(-5)mol·L^(-1)浓度范围内随ITS的浓度增大而呈线性增强,检测限为5×10^(-8)mol·L^(-1)。当体系中存在O_(3)时,ITS的SWV峰电流随臭氧浓度的增加而减小,往ITS溶液中加入臭氧溶液前后峰电流减小的差值与O_(3)浓度的对数值在5.0×10^(-9)~1.0×10^(-5)mol·L^(-1)范围内呈线性关系,检测限为1×10^(-9)mol·L^(-1),本方法具有灵敏度高,操作简便,重现性好的优点。 展开更多
关键词 臭氧 传感器 多壁碳纳米管 靛蓝三磺酸钾 方波伏安法
下载PDF
NaCl-KCl-MgCl_(2)-Cu_(2)S熔体中铜电沉积的电化学机理
19
作者 闵定伟 陈功 +3 位作者 文棠根 石忠宁 黄义鹏 杨少华 《有色金属科学与工程》 CAS 北大核心 2023年第2期182-188,共7页
面对能源与环境危机的挑战,绿色冶金技术成为业内关注的焦点。以硫化铜矿为原料的火法炼铜过程产生大量的有害气体SO2,需要消耗额外的能源进行转化。相比之下,采用熔盐电解法直接将铜硫化物电分解为金属铜和单质硫,电解过程对环境友好。... 面对能源与环境危机的挑战,绿色冶金技术成为业内关注的焦点。以硫化铜矿为原料的火法炼铜过程产生大量的有害气体SO2,需要消耗额外的能源进行转化。相比之下,采用熔盐电解法直接将铜硫化物电分解为金属铜和单质硫,电解过程对环境友好。对700℃下NaCl-KCl-MgCl_(2)-Cu_(2)S熔盐体系中电沉积铜的阴极电化学过程进行研究。结果表明,Cu+通过一步单电子转移电化学反应生成Cu,电极过程由扩散传质控制,扩散系数为1.23×10^(-5) cm^(2)/s;Cu电沉积的成核生长为扩散控制的三维瞬时成核生长机理,形核成长为几十纳米至数微米大小的不规则颗粒微结构。 展开更多
关键词 熔盐电解 电沉积铜 电化学成核机理 方波伏安法
下载PDF
杀螟硫磷在离子液体修饰预处理玻碳电极上的电化学行为及测定
20
作者 刘新胜 曹祥 李永红 《化学研究与应用》 CAS 北大核心 2023年第7期1579-1586,共8页
采用滴涂法制备了离子液体(IL)修饰预处理玻碳电极(IL/PGCE),建立了一种用于高效检测杀螟硫磷(FNT)的方法。利用循环伏安法(CV)对IL/PGCE进行了表征;通过方波伏安法(SWV)研究了杀螟硫磷在修饰电极上的电化学行为,并利用扫速研究了杀螟... 采用滴涂法制备了离子液体(IL)修饰预处理玻碳电极(IL/PGCE),建立了一种用于高效检测杀螟硫磷(FNT)的方法。利用循环伏安法(CV)对IL/PGCE进行了表征;通过方波伏安法(SWV)研究了杀螟硫磷在修饰电极上的电化学行为,并利用扫速研究了杀螟硫磷在IL/PGCE上的反应过程;讨论了pH值、预处理电位和时间、修饰剂含量、富集电位和时间等影响传感器性能的重要参数。在最优条件下,修饰电极对杀螟硫磷展现出较好的电化学响应,在0.001~1μg·L^(-1)和1~100μg·L^(-1)的范围内,峰电流与杀螟硫磷浓度之间呈现良好的线性关系。该方法具有较好的重现性和抗干扰能力,能够用于实际样品中杀螟硫磷的检测,样品回收率为89.6%~125.5%。 展开更多
关键词 玻碳电极 预处理 离子液体 方波伏安法 杀螟硫磷
下载PDF
上一页 1 2 13 下一页 到第
使用帮助 返回顶部