ELECTROANALYSIS
·
2019
·Vol. 32
·期 3
·620-625
·
IF 2.691
Xiangyu Ma,Kun Qian,Martha Kandawa-Schulz,Weimin Miao,Yihong Wang
Copper ion (Cu 2+ ) is one of the heavy metal ions which has been considered as a severe pollutant affecting the environment and human health. Therefore, it is necessary to detect Cu 2+ sensitively and conveniently in food and drinks. However, the gold standard method that inductively coupled plasma mass spectrometry (ICP-MS) is expensive equipment required and time-consuming. In this work, a highly sensitive and facile electrochemical method was studied to directly determine the concentration of Cu 2+ without cumbersome modification on the surface of glassy carbon electrode (GCE). In the presence of ferric ion (Fe 3+ ), Cu 2+ could play a role of catalyst in the detection system, and the electrochemical signal of differential pulse voltammetry (DPV) response to Cu 2+ could be amplified obviously. Under the optimal conditions, a good linear relationship was obtained in the range of 1 nM to 5 μM with a detection limit of 57.5 pM (S/N=3) were obtained. Besides, the proposed method has good applicability for the detection of Cu 2+ in tap water. Furthermore, the copper complex was detected and the results were indicated the proposed method was effective and sensitive.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 1
·628-632
·
IF 1.556
Hu Xin,Miao Yuqing,Zhou Shilin,Liang Xiaocai
Here we report a Bi/mesoporous carbon modified glass carbon electrode (Bi-MC-GCE) for the detection of heavy metal ions Zn, Cd and Pb. Bi(NO3)3 was firstly entrapped into the holes of MCs by sonicating them together in solution. Then the dispersed mixture was pipetted
onto the surface of GCE and left to dry. Bi(NO3)3 in the holes of MCs was reduced to metallic Bi during the process of deposition for square wave stripping analysis. The obtained Bi-MC-GCE exhibits significantly enhanced sensitivity for Zn, Cd and Pb detection compared
to blank GCE, bismuth or MC alone modified GCE, which is attributed to the high specific surface area of MCs and the increased amount of entrapped bismuth as active sites for the deposition and stripping of heavy metal ions. A linearship is observed for the concentration of Zn, Cd, and Pb
from 10 to 110 ppb. The relative standard deviation was 3.7% for Zn, 3% for Cd and 8% for Pb at the 90 ppb level (n = 3). The suggested Bi-MC-GCE exhibits a potential application for real water sample analysis.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 161
·期 1
·B9
·
IF 2.588
Weimeng Si,Zhen Han,Wu Lei,Qiuju Wu,Yuehua Zhang,Mingzhu Xia,Qingli Hao
A fast and sensitive method for the determination of Imidacloprid (IMI) based on a simply pretreated glassy carbon electrode (GCE) has been developed. The easy activation at 2.0 V for only 30s of GCE leads to obvious catalytic property to IMI. The electrocatalytic properties and the electron-transfer kinetics of the activated GCE were investigated by cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy. The reduction mechanism of IMI was put forward and the limit of detection (LoD) was estimated to be about 0.61 μM.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2012
·Vol. 28
·期 5
·497-502
·
IF 1.255
Li Yamin,Wu Shufang,Luo Peili,Liu Jie,Song Ge,Zhang Kai,Ye Baoxian
An ultrasensitive voltammetric sensor, a simply coated graphene-Nafion suspension on a glass carbon electrode surface, was fabricated and used to investigate the electrochemical behavior of theophylline as described in the present paper. The results indicated that this voltammetric sensor exhibited a special recognition capacity to determine theophylline as well as having high sensitivity due to the excellent characteristics of graphene and the adsorption action of Nafion for theophylline. Under the selected condition using differential pulse voltammetry, the response peak currents had a linear relationship with the theophylline concentrations in two ranges from 1.0 × 10 –8 – 1.0 × 10 –6 and 2.0 × 10 –6 – 3.0 × 10 –5 mol L –1 with a low detection limit of 6.0 × 10 –9 mol L –1 . Moreover, according to the results obtained in the analysis of theophylline in two standard samples, it demonstrated the applicability of present method into real sample determination.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2021
·Vol. 146
·期 13
·4384-4390
·
IF 4.616
Haofan Wang,Yin Guo,Hongcheng Pan
The sensitive determination of selenium and copper is of importance for environmental monitoring and food safety. A stripping voltammetric determination of selenium and copper in water and selenium-rich foods was developed using hierarchical dendritic gold nanostructure (AuHD) modified glassy carbon electrodes (GCE). The AuHD thin films were electrodeposited potentiostatically onto the GCE from a solution containing 25 mM HAuCl4 and 0.1 M Na2SO4 at −0.6 V for 20 min. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) studies showed that the electrodeposited gold thin film shows a nanoforest-like morphology with a thickness of about 30–40 μm and a hierarchical dendritic structure with primary-, secondary-, and higher-order branches. Se(IV) and Cu(II) in a 0.1 M H2SO4 solution were determined by square-wave anodic stripping voltammetry using the AuHDs/GCE as the working electrode. Prior to anodic stripping, Se(IV) and Cu(II) were accumulated onto the working electrode surface at −0.2 V for 300 s. The stripping peak currents of Se(IV) at 0.81 V and Cu(II) at 0.31 V were positively correlated with the concentrations of Se(IV) and Cu(II) in a range of 50–700 nM. The limits of detection (3σ) for Se(IV) and Cu(II) were 1.4 nM and 3.7 nM, respectively. The accuracy of the method was verified by analysing certified water standard reference materials, and the results showed that the method has good accuracy and high precision. The method was used to determine selenium and copper in tap water, selenium-rich rice and selenium-rich eggs. The results were compared with those obtained by using inductively coupled plasma-mass spectrometry (ICP-MS) and found to be consistent with those of ICP-MS. The proposed method had the advantages of simplicity, rapidity, good reproducibility, and high sensitivity and it can be used for the analysis of real samples.
研究领域:
环境科学
·
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2022
·
IF 2.731
Huimin Li,Yapan Shi,Yudong Gao
A new voltammetric sensor, simultaneous electropolymerization of L-Citrulline (L-Cit) and β-cyclodextrin (β-CD) film modified glassy carbon electrode (GCE) was built for the first time. It was used to construct this sensor for quantification of these important pesticides and sensitive determination of metribuzin. The proposed metribuzin sensor displays excellent performance with wide linear range (3.0 × 10−8 ~ 1.0 × 10−6 mol L−1), ultralow detection limit of 10 nM (S/N = 3), and favourable specificity. Also, the sensor was applied for determination of metribuzin in the real samples, the satisfying results are achieved. The results imply that the proposed sensor can be potentially used for the environmental pollution science and environmental analytical chemistry.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2024
·Vol. 14
·期 1
·87
·
IF 2.6
Yuantao Yang,Junli Wang,Xuanbing Wang,Jinlong Wei,Xiaoning Tong,Ruidong Xu,Linjing Yang
The electrolytic refining of crude tin is generally carried out in the fluorosilicic acid (H2SiF6) system with the assistance of bone glue and β-naphthol. However, the high saturated vapor pressure and low stability of H2SiF6present environmental concerns and do not align with sustainable development goals. In this paper, the electrochemical behavior of tin on a glassy carbon (GC) electrode was studied in a relatively green and environmentally friendly methanesulfonic acid (MSA) system. Bone glue, sodium lignosulfonate, and β-naphthol were used as additives to make the deposit morphology smooth and to ensure grain refinement. The electrochemical reduction process of Sn2+in an MSA system is a quasi-reversible process controlled by diffusion. The apparent activation energyEa= 14.189 kJ/mol for the ion diffusion of Sn2+was further calculated. The results of chronoamperometry showed that the electrocrystallization of Sn2+on the GC electrode gradually tended to three-dimensional instantaneous nucleation with the increase in applied potential. The morphology and phase of the deposits were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the deposits were uniform and dense pure tin. This work elucidates the electrochemical behavior of tin in a methanesulfonic acid system.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-7
·
IF 4.58
Huang Wei,Zhang Ting,Hu Xiaoya,Wang Yang,Wang Jianmin
A porous carbon material doped with an iron species (Fe/PC) was prepared by carbonizing a mixture of zeolitic imidazolate framework-8 in the presence of iron(II) ions. The resulting material was characterized by X-ray diffraction, nitrogen adsorption isotherms, transmission electron microscopy, and by Raman and X-ray photoelectron spectroscopy. Fe/PC was the deposited on the surface of glassy carbon electrode (GCE) to obtain a sensor for amperometric determination of phenolic compounds. The unique catalytic activity, good electrical conductivity and hierarchical structure of the Fe/PC composite results in good electrooxidative activity towards hydroquinone (HQ; typically at 44 mV) and catechol (CC; typically at 160 mV). Under optimal conditions, the amperometric responses are linear in the range from 0.1 to 120 μmol · L −1 for HQ, and from 1.0 to 120 μmol · L −1 for CC. The respective detection limits are 14 and 33 nmol · L −1 . The sensor is highly selective against potential interferents and was successfully applied to the determination of HQ and CC contents in (spiked) water samples.
An amperometric sensor for phenolic compounds was constructed by using a metal-organic framework derived iron doped porous carbon material.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Shuai Hu,Shiyu Zhang,Jiangyang Qin,Ke Cai,Chenxi Peng,Lixia Luo,Yingying Gu,Yong Mei
Lead (Pb) and cadmium (Cd) are pervasive environmental pollutants known for their significant biological toxicity. The traditional methods for detecting these ions often necessitate large-scale instruments and complex procedures. In contrast, electrochemical detection methods offer advantages such as rapidity, portability, and sensitivity, making them suitable for the simultaneous detection of heavy metals. Metal-organic frameworks (MOFs), characterized by their exceptional adsorption and enrichment capabilities for heavy metal ions, have shown promise in this regard. Nevertheless, the poor conductivity of most MOFs has limited their electrochemical applications. In this study, glassy carbon electrodes (GCEs) were modified using the MOF ZIF-8, in combination with a bismuth complex and carboxylated multi-walled carbon nanotubes, resulting in the fabrication of Bi@ZIF-8/CMWCNTs/GCE electrochemical sensors. Leveraging the porous nature and large specific surface area of ZIF-8, the lead and cadmium ion adsorption by bismuth akin to mercury, and the conductivity of carboxylated multi-walled carbon nanotubes, the sensor developed in this study exhibits excellent capability for simultaneous detection of lead and cadmium ions in water. Under optimized conditions, Pb 2+ and Cd 2+ showed good linear relationships with the peak current in the concentration range of 2.0–50.0 μg/L. In the concentration range studied, the regression equations for Pb 2+ and Cd 2+ were determined as follows: y = 0.2982x + 0.4553 (r = 0.9962) for Pb 2+ and y = 0.3631x + 0.1242 (r = 0.9949) for Cd 2+ . The detection limits for Pb 2+ and Cd 2+ were 0.76 μg/L and 0.87 μg/L, respectively. The relative standard deviations (RSDs) for 50 μg/L mixed standard solution of Pb and Cd were 1.89 % and 1.23 %, respectively. Furthermore, the RSDs for the same modified electrode tested with 50 μg/L Pb 2+ and Cd 2+ mixed standard solution over seven consecutive days were 2.27 % and 1.42 %, respectively, under identical conditions. In practice, the lead and cadmium concentrations of a lake were found to range from 4.42 μg/L to 5.60 μg/L, while the lead and cadmium concentrations of effluent from a wastewater plant ranged from 11.83 μg/L to 14.49 μg/L. This research not only describes a new electrochemical platform for the simultaneous determination of lead and cadmium in water but also provides a new method for the simultaneous determination of lead and cadmium in water. This research is valuable for promoting the application of MOFs in the field of electrochemistry .
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 322
·期 3
·2049-2056
·
IF 1.186
Zhou Zhiping,Zhou Yueming,Liang Xizhen,Xie Fang,Liu Shujuan,Ma Jianguo
Direct and rapid determination of trace amounts of uranium in natural water remains a challenge. Herein, determination of uranium by differential pulse adsorptive stripping voltammetry (DPAdSV) in presence of cupferron and diphenylguanidine on glassy carbon electrode was investigated. Under optimized conditions, the DPAdSV peak current was proportional to the concentration of uranium in the range of 3–80 μg L −1 with the detection limit of 1.0 μg L −1 and a linear correlation coefficient of 0.999. The DPAdSV method based on GCE was successfully applied to direct determination of trace uranium in natural water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Qingshuang Wei,Xinrong Zong,Yitao Lv,Chaoqi Wang,Jiacheng Wang,Min Zhang
Electro-activation has been an important surface modification strategy to enhance the signal of analytes on glassy carbon electrodes (GCE). However, its unique effects on certain analytes remain to be further explored. Hence, due to the electro-active hydroxyl groups (–OH), phenolic compounds were selected as the analyte to reveal it to some extent. Except for the improved electrocatalytic activity of electro-activated GCE (e-GCE) which was attributable to the improved charge transfer ability and optimized surface properties ( eg. surface area, surface roughness, and active sites), the oxygen-containing functional groups on the e-GCE surface were also identified as being of significant importance for enhanced response of phenolic compounds. After electro-activation, the newly generated C O constituted 12.81 % of the C1s spectra and 51.75 % of the O1s spectra, effectively facilitating the formation of donor–acceptor complexes between the analytes and the electrodes, thereby enhancing the adsorption of phenolic compounds. Furthermore, it was found that the structure of phenolic compounds had a remarkable impact on the response signal. The increase in the number of –OH groups involved in the electron transfer process, the increase in the number of aromatic rings, and the enhancement of the electronegativity of substituents all contributed positively to the response signal of phenolic compounds. At last, based on the great adsorption of catechol, a sensor for catechol with a sensitivity 12-fold higher than prior has been established. These results provide insights for the subsequent fabrication of green sensors for more electro-active molecules.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wanqing Zhang,Zhongyin Zhang,Yuanchao Li,Jun Chen,Xiaobo Li,Yadong Zhang,Yuping Zhang
A novel MIL-101(Cr)/XC-72 modified glassy carbon electrode (GCE) sensor was fabricated to determine chloramphenicol (CAP). The electrochemical sensors were constructed by using MIL-101(Cr), XC-72, MIL-101(Cr)/XC-72, and their electrochemical performances were studied with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. In comparison with the GCE , MIL-101(Cr)/GCE and XC-72/GCE sensors, the MIL-101(Cr)/XC-72/GCE sensor exhibited a well-defined redox peak towards CAP in phosphate buffer solution (PBS). The effects of the ratio of MIL-101(Cr) and XC-72, accumulation time, scan rate, and pH value were carefully considered. Under the optimized conditions, the sensor exhibited excellent response for CAP. The linear concentration ranges of CAP were from 1.0 × 10 −8 to 2.0 × 10 −5 M (R 2 = 0.985), with a low detection limit of 1.5 × 10 −9 M (S/N = 3). Furthermore, the MIL-101(Cr)/XC-72/GCE sensor was successfully applied to the determination of the real samples with satisfactory recoveries.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）