JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 8
·H502
·
IF 2.588
Wu Lei,Zhenyan Gu,Weimeng Si,Fengxiang Wang,Qingli Hao
Conducting poly (2,6-dimethoxynaphthalene) (PDMN), a novel fluorescent polymer was electrochemically synthesized in boron trifluoride diethyl etherate (BFEE) containing additional concentrated sulfuric acid via direct anodic oxidation of 2,6-dimethoxynaphthalene (DMN). The oxidation potential onset of DMN in this medium was 0.43 V, lower than other electrolyte media. PDMN films showed good electrochemical behavior and thermal stability. The structure and morphology of the polymer were investigated in detail. Fluorescent spectra indicated that the electrochemically polymerized PDMN was an excellent blue light-emitting material. The insoluble PDMN film deposited on the indium tin oxide glass was used to develop a sensor for the determination of imidacloprid based on the fluorescence quenching of PDMN. The interaction of imidacloprid and PDMN was investigated by electrochemical techniques. The fluorescent intensity of PDMN has a good linear relationship with the concentration of imidacloprid on the surface of PDMN in the range of 4.994 × 10−1 to 2.557 × 102 μg/mL with a detection limit of 3.093 ng/mL. The sensor based on PDMN films showed high recognition ability for imidacloprid and will have more potential applications in the industrial or environmental and healthy fields.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
NANO
·
2016
·
IF 0.951
Liang Yan,Zhicheng Li,Shaojun Zhang
In this study, a film of electrochemically reduced graphene oxide (ERGO) deposited onto a glassy carbon electrode (GCE) was prepared through the pulse potential method (PPM). The as-prepared film was characterized via scanning electron microscopy (SEM) and cyclic voltammetry (CV). The ERGO film was applied for the first time to develop a highly sensitive electrochemical sensor for imidacloprid determination. Results revealed that the ERGO film can effectively increase response towards imidacloprid reduction by significantly enhancing the reduction peak currents and decreasing the over potential of imidacloprid. Under optimum conditions, the modified electrode showed a linear voltammetric response to imidacloprid at concentrations ranging from 3 . 0 × 1 0 − 8 mol L − 1 to 1 . 1 × 1 0 − 6 mol L − 1 , with a detection limit of 1 . 0 × 1 0 − 8 mol L − 1 . The developed electrode is potentially a good candidate for imidacloprid determination. The proposed method provides a good recovery rate of imidacloprid in spiked practical samples, such as lake water and tap water.
研究领域:
分析化学
·
环境监测
·
电化学
·
农药残留检测
·
传感器技术
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Xiaohua Jiang,Dean Song,Dabin Wang,Ruiming Zhang,Qiannan Fang,Huiqing Sun,Fanyu Kong
Imidacloprid is a widely used neonicotinoid insecticide worldwide, and has attracted great concerns due to its potential threat to human and environment. Much effort was thus spent on developing the effective way for removing imidacloprid from water, but might also produce various degradation products with unknown risks. The hypothesis was then proposed that permanganate oxidation was probably the appropriate tool for eliminating imidacloprid and its toxicity through selective oxidation of specific groups. To that end, we studied the kinetics of permanganate/imidacloprid reaction by considering the effects of pH (5.0–9.0), temperature (15–35 °C), ionization strength (0.05–0.20 M), typical anions (Cl − , Br − , I − ) and humic acid . Based on the identified products from mass spectrometer , the main reaction pathway was found to be the hydroxylation of C–H bond at imidazole ring, leading to the decreased toxicity evaluated by ECOSAR program. Our results demonstrate that permanganate oxidation should be a very promising technique for controlling imidacloprid contamination by effective detoxification through highly selective partial oxidation. Moreover, this study has also paved the way toward applying permanganate oxidation for in situ chemical remediation of imidacloprid, though the corresponding standards need to be established in advance.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Jinmei Luo,Shuhuai Li,Chaohai Pang,Mingyue Wang,Xionghui Ma,Chenghui Zhang
Herein, a fluorescent probe was investigated for the detection of imidacloprid based on the fluorescence resonance energy transfer (FRET) between two carbon-based quantum dots, namely graphene- and carbon quantum dots (GQDs/C-dots). In an HAc-NaAc buffer solution at pH = 5.0, an effective FRET occurred between the GQDs and C-dots, significantly enhancing the C-dot fluorescence. When imidacloprid was added to the FRET system, the fluorescence intensity of the C-dots was quenched in a linear imidacloprid concentration-dependent manner, which allowed for the establishment of a new method for the determination of imidacloprid by GQD/C-dot FRET . Under optimised experimental conditions, the linear range of imidacloprid was 5–4000 × 10 −9 mol L −1 , with a correlation coefficient r and a detection limit of 0.998 and 8.23 × 10 −10 mol L −1 , respectively. This method was applied to the detection of imidacloprid residues in real samples, and a satisfactory recovery rate of standard additions was found between 93.0% and 105.6%.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2014
·Vol. 1
·期 6
·1063-1067
·
IF 0
Wu Lei,Zhen Han,Weimeng Si,Qingli Hao,Yuehua Zhang,Mingzhu Xia,Fengyun Wang
Based on the enhancement effect of graphene oxide (GO), a GO-modified glassy carbon electrode (GO/GCE) is prepared for the fast and sensitive electrochemical detection of the imidacloprid (IMI) insecticide, with high selectivity and stability, for the first time. The electrochemical behavior of imidacloprid on GO/GCE is investigated by using cyclic voltammetry, and graphene oxide is found to have a strong affinity towards IMI. The reduction peak current varies linearly with the concentration of IMI over the 0.8–10 μ M range and the limit of detection is 0.36 μ M . Graphical Natural selection: A glassy carbon electrode (GCE) is modified with graphene oxide (GO) by using a simple drop-casting method. An obvious interaction between the hydroxyl group of GO and the nitryl of imidacloprid (IMI) can be observed, which favours electrocatalysis towards IMI. This GO-modified electrode can be utilized as an electrochemical sensor for the detection of IMI with good sensitivity.
研究领域:
电化学
·
环境监测
·
传感器与生物传感器
·
分析化学
✓ 已验证
DOI
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Lihong Zhang,Chaowen Chen,Jia Zhang,Bin Liu,Guopeng Teng,Junjun Wang,Xin Zhang,Dongqing Cai,Zhengyan Wu
In this study, an alternating magnetic field-responsive controlled-release imidacloprid (IM) nanoplatform (MRCIN) was fabricated by loading IM in yolk–shell Fe3O4@C. Fe3O4@C with a large BET surface area (312.62 m2/g) acted as a carrier for IM. Interestingly, the Fe3O4 nanoparticles in MRCIN could vibrate under varied electromagnetic fields (VEFs) to boost the release of IM. Therefore, MRCIN presented an excellent alternating magnetic field-responsive controlled-release performance via designing the frequency and voltage, which could be proved by the release curve and control efficacy experiment. After release, the existence of Fe3O4 nanoparticles was in favor of the collection of MRCIN from water. Importantly, MRCIN could be reutilized at least three times. From the viewpoint of biosafety, Fe3O4@C owned a fine biocompatibility, and MRCIN had little influence on fish and earthworm without VEF. Thus, the study provides a simple and potential way to achieve the controlled release of IM, improve utilization efficiency, and decline pollution to the environment. This system might have a good practical value in sustainable pest control and green agriculture.
研究领域:
农业科学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 26
·26617-26624
·
IF 2.8
Yang Jiachuan,Yang Qian,Deng Jiaqi,Tao Zhexuan,Hua Xiude,Wang Minghua
A soil chemical barrier is the most important and common way to control termites; fast and on-site detection methods are significant tools to verify pesticide content meeting the standard requirements. In this study, conventional and enhanced immunochromatographic assays (ICAs) containing two test lines (TLs) were developed to semi-quantitatively detect imidacloprid in soil chemical barrier, and detection results were quantified by a smart phone. According to the results, the disappearance concentrations of first TL (TL-1) and second TL (TL-2) in an enhanced ICA and conventional ICA were 5 and 20 ng/mL and 20 and 80 ng/mL with the naked eye. The sensitivity of TL-2 was four times that of TL-1 in both ICAs, consistent with the maximum and minimum concentration differences for imidacloprid in Jiangsu province’s “the technical regulation of assay and evaluation on chemical soil barrier of termite prevention treatment in buildings”. The results of TLs can be used to judge whether the amount of imidacloprid in soil chemical barrier meets the standard. Enhanced and conventional ICAs were available for further quantitative testing with a smart phone, and the limit of detection (LOD) was 0.74 and 3.17 ng/mL, respectively. Moreover, some soil chemical barrier samples from several areas in Wuxi, Jiangsu province, were used to test by ICAs and high-performance liquid chromatography (HPLC), and the results of ICAs correlated well with HPLC.
研究领域:
分析化学
·
环境科学
·
害虫防治
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 19
·14882-14890
·
IF 2.828
Shi Haiyan,Sheng Enze,Feng Lu,Zhou Liangliang,Hua Xiude,Wang Minghua
A highly sensitive direct dual-labeled time-resolved fluoroimmunoassay (TRFIA) to detect parathion and imidacloprid simultaneously in food and environmental matrices was developed. Europium (Eu 3+ ) and samarium (Sm 3+ ) were used as fluorescent labels by coupling separately with L 1 -Ab and A 1 P 1 -Ab. Under optimal assay conditions, the half-maximal inhibition concentration (IC 50 ) and limit of detection (LOD, IC 10 ) were 10.87 and 0.025 μg/L for parathion and 7.08 and 0.028 μg/L for imidacloprid, respectively. The cross-reactivities (CR) were negligible except for methyl-parathion (42.4 %) and imidaclothiz (103.4 %). The average recoveries of imidacloprid ranged from 78.9 to 104.2 % in water, soil, rice, tomato, and Chinese cabbage with a relative standard deviation (RSD) of 2.4 to 11.6 %, and those of parathion were from 81.5 to 110.9 % with the RSD of 3.2 to 10.5 %. The results of TRFIA for the authentic samples were validated by comparison with gas chromatography (GC) analyses, and satisfactory correlations (parathion: R
2 = 0.9918; imidacloprid: R
2 = 0.9908) were obtained. The results indicate that the dual-labeled TRFIA is convenient and reliable to detect parathion and imidacloprid simultaneously in food and environmental matrices.
研究领域:
食品安全检测
·
环境监测
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Peng Zhang,Xingying Meng,Aiju Liu,Mingming Ma,Yifei Shao,Hongwen Sun
The effects of an electron shuttle (dissolved black carbon (DBC) derived from biochar) on the microbial reduction of ferrihydrite and subsequent imidacloprid (IMI) degradation were studied. The results showed that DBC addition enhanced the microbial reduction of Fe(III) in ferrihydrite and increased the quantity of Fe(II) released into the liquid phase. The electron transfer capacity of DBC was significantly influenced by the content of redox-active oxygen-containing functional groups (e.g., quinone , hydroquinone, and polyphenol groups), which was dependent on the pyrolysis temperature. The electrochemical characteristics of DBC resulted in enhanced electron transfer , which promoted Fe(III) reduction and mediated the microbial transformation of ferrihydrite. The microbial transformation of ferrihydrite resulted in the formation of secondary minerals such as siderite and vivianite . The IMI degradation efficiency was related to the Fe(III) reduction rate and the pyrolysis temperature used in DBC production, and the degradation pathways were nitrate reduction and imino hydrolysis induced by the Fe(II) generated from the reduction of Fe(III) in ferrihydrite. The results obtained in this study provide new data for understanding the multifunctional roles of biochar-derived DBC in the redox and transformation processes of iron minerals induced by iron-reducing bacteria, the related biogeochemical cycles of iron and the fate of pollutants .
研究领域:
环境科学
·
微生物学
·
土壤化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Yijun Yin,Xiaoyi Huang,Wang Wang,Xia Liu
Carbon and oxygen co-doped phosphotungstate were successfully prepared by one-pot thermal treatment with phosphotungstic acid (HPW) and melamine-cyanuric acid supramolecule (MCA) as precursors. Based on the results of X-ray photoelectron spectra (XPS), UV–visible diffuse reflectance spectroscopy (UV–vis DRS), and Photoluminescence (PL) measurements, the existence of C O in CNPW-8-420 has been confirmed. Carbon and oxygen which are co-doped as C O in the Keggin structure of phosphotungstate are contributed to the separation of charge carriers and can increase the amount of the photocatalysis active sites. With the amount of HPW increasing, MCA decomposed in CNPW-8-420 and CNPW-20-420 without synthesizing g-C 3 N 4 , leading to in-situ doped of C O. Furthermore, the increase of treatment temperature can cause the supramolecular structure of MCA to overbreak, leading to carbon and nitrogen elements doped in CNPW-8-500. The photocatalytic degradation efficiency rate constant of CNPW-8-420 is 0.40 h −1 and it can be reused 3 times with no obvious change. LC−MS/MS revealed the most likely photocatalytic degradation pathway and intermediates of imidacloprid including imidacloprid olefin, guanidine-type imidacloprid, imidacloprid urea, 6-chloronicotinic acid, 5-hydroxy-imidacloprid, and 4,5-dihydroxy-imidacloprid. This study provides a promising strategy for the construction of co-doped POMs photocatalysts using different supramolecule precursors.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 10
·2326-2333
·
IF 2.413
Zhang Wen,Liu Chao,Zou Xiaobo,Zhang Han,Xu Yiwei
This work introduces a β-cyclodextrin/multi-walled carbon nanotube (β-CD/MWCNT)–modified microelectrode array (MEA) for rapid determination of imidacloprid in vegetables. The MEA, fabricated on a silicon wafer, contains 20 parallel-connected working electrodes, a counter electrode and a reference electrode. The MWCNT is drop-casted onto the working electrode area, and β-CD is decorated onto the MWCNT layer with electropolymerization. Electrochemical behaviors of the as-fabricated sensor are investigated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Obtained results validate that the proposed sensor has a large electroactive area, great electrical conductivity, and high sensitivity. During preparation and application of the sensor, 0.5 mg mL −1 MWCNT suspension and phosphate-buffered solution (0.1 mol L −1 , pH = 7) are found to optimize experimental conditions. Under optimized conditions, a wide linear range as 5 to 100 μmol L −1 is obtained for target imidacloprid, and the limit of detection (LOD, S/N = 3) is well defined as 0.629 μmol L −1 . The sensor is used for sensing imidacloprid in cabbage, cucumber, and tomato. The results from this method are in accordance with high-performance liquid chromatography-mass spectrometry (HPLC-MS) data.
研究领域:
分析化学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2018
·
IF 3.974
Yong Li,Lixuan Yang,Huangqian Yan,Meng Zhang,Jing Ge,Xiangyang Yu
The uptake, translocation and accumulation behaviours of imidacloprid in six leafy vegetables , including Xiadi cabbage (XDC), Huaguan cabbage (HGC), Gaogengbai (GGB), Shanghaiqing (SHQ), Kangresijiqing (KRQ) and Ziyoucai (ZYC), were investigated under hydroponic conditions. Seedling stage (S-stage), rapid growth stage (R-stage) and maturation stage (M-stage) for each vegetable were considered. The root concentration factor (RCF), translocation factor (TF) and bioconcentration factor (BCF) were used to compare the difference. The results show that during 48 h of exposure, the total amount of imidacloprid taken up by the test vegetables increased with vegetable growth; however, the imidacloprid concentration in vegetable tissues varied significantly according to the variety and growth stage. For individual vegetables, imidacloprid was most easily accumulated into HGC and GGB shoots at R-stage, but into XDC, KRC and ZYC shoots at S-stage. For varieties, the ability of accumulating imidacloprid from solution to shoots seemed to follow the order of GGB > XDC > SHQ > KRQ > HGC > ZYC. Pearson's correlation analysis revealed significant negative correlations between daily transpiration and log BCF and between log RCF and log TF , indicating that the difference of uptake, translocation and accumulation behaviours of imidacloprid in vegetable varieties and growth stages may be related to the daily transpiration and the ability of concentrating imidacloprid in vegetable roots.
研究领域:
植物学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）