SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Wenbo Sun,Peiling Gao,Jiutao An,Jianan Li,Xinyong Li
Hydrogen sulfide (H 2 S), as both an endogenously gaseous signaling compound and an environmentally hazardous substance, has shown great relevance to human health and ecosystem safety. However, a reliable sensing platform for the facile detection of trace H 2 S is still a challenge to be addressed. Herein, a AgI-TiO 2 nanorods array electrode was fabricated through a hydrothermal method followed by ultrasonic impregnation treatment to construct an ultrasensitive photoelectrochemical H 2 S sensor. The decorated AgI could not only play a significant role in the enhancement of visible light absorbance as a narrow bandgap sensitizer but also contribute to the specific affinity towards sulfide as the recognition unit. In the presence of sulfide, multiple heterojunctions were established in situ due to I − -to-S 2− exchange at the AgI sites, proportionately increasing the photocurrent response of the functionalized PEC electrodes. The designed photoelectrochemical (PEC) sensing platform could achieve the quantitative determination of sulfide in a wide range of 1 ∼ 1000 nM with an effective detection limit of 1.25 nM. Additionally, the detection performances for practical H 2 S-containing waste gas and the biological environment were also evaluated. This work could broaden a new vision of the delicate design of interfaces for ultrasensitive environmental analysis.
研究领域:
环境科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Xin Futao,Luo Min,Li Chun,Ma Lingling,Xu Diandou,Xu Gang,Li Xi,Shao Yang
A rapid method has been developed for determining ultra-low level Pu isotopes in atmospheric particulate matter samples using SF-ICP-MS and TEVA resin. The Pu purification, ashing conditions and microwave digestion, were optimized to achieve high decontamination factor of U (4.1 × 10 4 ) and stably high Pu recovery (80–90%). The method detection limits were estimated to be 0.83 fg/g for 239 Pu and 0.70 fg/g for 240 Pu. Four IAEA certified reference materials were used for method evaluation. Finally, the method was successfully applied to determine the source of Pu in atmospheric particulate matter samples. The method can be performed within 16 h.
研究领域:
环境科学
·
核化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2018
·
IF 3.3
Qiaoling Xie,Tao Lin,Fuming Chen,Dandan Wang,Bo Yang
Sulphur-containing chitosan, a water-soluble derivative of chitosan, was synthesized by using chitosan and other reagents. This sulphur-containing chitosan was combined with chitosan to recover ultra-trace palladium in HCl medium. The effects of the chelating dosages, pH, chelating precipitation rate, initial Pd concentration and coexisting cations were systematically investigated via chelating precipitation experiments. Under the optimized conditions, greater than 95% of palladium was recovered from the HCl medium, with pH ranging from 2 to 5.5 and proper dosages of chitosan and sulphur-containing chitosan, which were related to the concentration of Pd(II) ions. In addition, the presence of coexisting cations (Cu 2+ , Ni 2+ , Fe 2+ , and Sn 2+ ) had no effect on the recovery rate of palladium. The recovery mechanism of palladium by chitosan and sulphur-containing chitosan was studied via molecular weight analyses, elemental analyses, FT-IR analyses and XPS analyses. The proposed chelating precipitation method was successfully applied to the recovery of ultra-trace palladium in HCl medium.
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
Journal of Analytical Methods in Chemistry
·
2014
·
IF 0.948
Hongzhi Hu,Ying Liang,Shuo Li,Qing Guo,Chancui Wu
In the existence of appropriate amount of disodium ethylenediaminetetraacetate (EDTA), precipitation would not occur in seawater and other natural waters even if the sample solution was adjusted to strong basicity, and the NH3-OPA-sulfite reaction at the optimal pH range could be used to determine ammonium in natural waters. Based on this, a modified o-phthalaldehyde fluorometric analytical method has been established to determine ultratrace ammonium in natural waters. Experimental parameters, including reagent concentration, pH, reaction time, and effect of EDTA, were optimized throughout the experiments based on univariate experimental design. The results showed that the optimal pH range was between 10.80 and 11.70. EDTA did not obviously affect the fluorometric intensity. The linearity range of the proposed method was 0.032–0.500 µmol/L, 0.250–3.00 µmol/L, and 1.00–20.0 µmol/L at the excitation/emission slit of 3 nm/5 nm, 3 nm/3 nm, and 1.5 nm/1.5 nm, respectively. The method detection limit was 0.0099 µmol/L. Compared to the classical OPA method, the proposed method had the advantage of being more sensitive and could quantify ultratrace ammonium without enrichment.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Huaifang Fang,Jie Zhang,Shu Zhou,Wei Dai,Chunya Li,Dongyun Du,Xinyu Shen
Atomic layers of antimony were electrodeposited onto glassy carbon electrode in overpotential region. The antimony deposition was characterized by chronocoulometry and scanning electron microscopy. Based on the excellent electrochemical properties of the glassy carbon/antimony system, a simple method was developed for rapid and reliable determination of ultra-trace Sb(V) by square-wave anodic stripping voltammetry. The key operational parameters of influencing the electroanalytical response of Sb, such as deposition potential, deposition time, and composition of the measurement solution, were investigated. Under the optimized condition, the method provided a linear calibration ranging from 1 to 16 pg L −1 with a respective correlation coefficient of 0.9906. The detection limit was 1.64 fmol L −1 , which is the lowest ever reported for an electroanalytical technique and one of the lowest analytical methods for Sb(V) determination. The relative standard deviation for a Sb(V) solution (5 pg L −1 ) was 3.2% for eight successive assays. Finally, the method was applied to the determination of antimony in tap water and compared with inductively coupled plasma mass spectrometry technique.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 21
·5165-5172
·
IF 3.307
Wang Qingyu,Li Shuhuai,Li Jianping
A new molecularly imprinted polymer electrochemiluminescence (ECL) sensor was developed for the detection of clopyralid (CPD) based on enzyme-biocatalyzed amplification. CdTe quantum dots were immobilized on the surface of an electrode by reaction with p -aminothiophenol preadsorbed on the electrode. Then a molecularly imprinted film was formed by electrochemical polymerization of o -phenylenediamine in the presence of CPD on the CdTe-modified gold electrode. During the analytical cycle, horseradish peroxidase (HRP)-labeled CPD was replaced by CPD in the sample. The amount of HRP on the molecularly imprinted polymer electrode decreased, and then less H 2 O 2 was catalytically decomposed. Subsequently, the ECL intensity of the CdTe–H 2 O 2 system was enhanced. There was a good linear relationship between ECL intensity and the concentration of CPD in the range from 2.0 × 10 -11 to 2.5 × 10 -10 mol/L and in the range from 2.5 × 10 -10 to 3.5 × 10 -8 mol/L. The detection limit was 4.1 × 10 -12 mol/L. The sensor was applied to determine CPD in vegetable samples.
A molecularly imprinted electrochemiluminescence sensor was fabricated for ultratrace clopyralid determination. The sensitivity was significantly improved with the enhancement of the ECL intensity of quantum dot via the enzymatic reaction of HRP
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 9
·3876-3882
·
IF 1.821
Yamei Li,Limin Zhang,Huayun Han,Xiaoli Tian,Xinxin Shi,Kai Wang,Shusheng Zhang
A new modified silica gel with alizarin complexone has been prepared and proven to act as a promising adsorbent. Ultra trace Cu(II) and Cd(II) can be selectively enriched and separated from rice and water samples by solid phase extraction and detected by FAAS. What is more, 0.003 mol L−1 and 0.25 mol L−1 of HNO3 can be used as eluent for the gradient elution of Cd(II) and Cu(II), respectively. Cu(II) could be completely separated from Cd(II) and monitored with the naked eye using color agent 5-Br-PADAP. The selectivity of the adsorbent and the effects of solution pH, type and concentration of the eluent, and foreign ions have been investigated and optimized. Under the optimized conditions, the adsorption capacity for Cu(II) and Cd(II) was 0.511 and 0.157 mmol g−1, respectively. Determination of Cu(II) and Cd(II) by FAAS was linear in the range of 1.0–200 µg L−1 and 2.5–100 µg L−1 with a detection limit of 0.21 µg L−1 and 0.46 µg L−1, respectively. Comparing the determination results for Cu(II) and Cd(II) in water and rice using the new method with those detected by ICP-MS, a considerable difference was not observed between the two methods. The method was validated with the certified reference material GBW08511 rice. Moreover, the determination of Cu(II) in the range of 20–120 µg L−1 is sensitive to the naked eye and the determination results are good in agreement with those detected by UV-Visible spectrometry. The proposed method was simple and capable of determining Cu(II) and Cd(II) in real samples accurately.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2013
·
IF 3.334
Lin Gao,Xiuying Li,Qi Zhang,Jiangdong Dai,Xiao Wei,Zhilong Song,Yongsheng Yan,Chunxiang Li
In this study, we first present a general protocol for making fluorescent molecularly imprinted polymer microspheres via precipitation polymerisation. We first prepared the fluorescent molecularly imprinted polymer microspheres upon copolymerisation of acrylamide with a small quantity of allyl fluorescein in the presence of cyhalothrin to form recognition sites without doping. The as-synthesised microspheres exhibited spherical shape, high fluorescence intensity and highly selective recognition. Under optical conditions, polymer microspheres were successfully applied to selectively and sensitively detect cyhalothrin, and a linear relationship could be obtained covering the lower concentration range of 0–1.0 nM with a correlation coefficient of 0.9936 described by the Stern–Volmer equation. A lower limit of detection was found to be 0.004 nM. The results of practical detection suggested that the developed method was satisfactory for determination of cyhalothrin in honey samples. This study therefore demonstrated the potential of molecularly imprinted polymers for detection of cyhalothrin in food .
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Jing Dong,Xianzhong Fan,Fengmin Qiao,Shiyun Ai,Hao Xin
This paper proposed a novel method for ultra-trace detection of pesticides combining electrochemical reduction of Ellman's reagent with acetylcholinesterase (AChE) inhibition. The amperometric biosensor, fabricated by immobilizing AChE on multi-walled carbon nanotubes-chitosan (MWCNTs-Chi) nanocomposites modified glassy carbon electrode, enjoyed high sensitivity owing to the excellent conductivity and favourable biocompatibility of MWCNTs-Chi nanocomposites. Meanwhile, the sensitivity of the biosensor was further enhanced using the electrochemical reduction signal of DTNB for determination. Under optimum conditions, methyl parathion was detected based on its inhibition effect on AChE activity and the subsequent change in electrochemical reduction response of DTNB. Good relationship was obtained between the reduction current and pesticide concentration in the ranges of 5.0 × 10 −7 to 1.0 × 10 −12 M with a detection limit of 7.5 × 10 −13 M (S/N = 3). Moreover, the proposed protocol was successfully employed for the determination of methyl parathion in water and soil samples.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2019
·
IF 7.466
Yong Han,Limei Shi,Xueli Luo,Xiumei Chen,Weixia Yang,Wenzhi Tang,Jianlong Wang,Tianli Yue,Zhonghong Li
Sulfhydryl functionalized carbon dots (HS-CDs) mediated by Ag + were used to develop a fluorescent sensor for the determination of Hg 2+ in aqueous solutions. FTIR and XPS confirmed the successful modification of -SH on the surface of HS-CDs. Dripping Ag + into HS-CDs yielded brown agglomerates of silver thiolate leading to strong FL quenching of the HS-CDs. The signal-on fluorescent sensor was acheived by dispersing the precipitates in a PBS buffer (pH 7.4, 0.01 mol/L). Remarkable FL recovery was observed upon the addition of Hg 2+ into the sensor owing to the energy trap induced by exposure of -NH 2 on the surface of the HS-CDs. Fluorescence intensities of the HS-CDs were linearly recovered in Hg 2+ concentrations of 0.01–0.75 nmol/L with an extremely low detection limit of 4.2 pmol/L. The sensor exhibited stronger specificity toward Hg 2+ than co-existent metal ions. The detecting results for real water samples obtained by the sensor showed good agreement with ICP-AES (P > 0.05), demonstrating a sensitive and selective fluorescent nanosensor for ultra-trace determination of Hg 2+ with acceptable precision and satisfactory accuracy.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Zhenzhen Cai,Zhiheng Huo,Gaosheng Li,Xu Cheng,Fang Xiao,Yuwan Du,Baiyi Zu,Xincun Dou
The specific fluorescent detection of α-methyltryptamine (AMT) presents a great challenge because similar amine groups and benzene rings exist in a variety of amines. Here, we show the precise modulation of the electron-withdrawing strength of the π-conjugate bridge in aldehyde-containing Schiff base-based fluorescent probes for ultratrace AMT discrimination. It is found that different electron-withdrawing groups −C6H4, −C6H2N2, and −C6H2Br2 as the π-conjugate bridge of the 2-dicyanomethylidene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF)-based probes can classify and identify organic amines with different amine nucleophilicities. Notably, the probe with −C6H2Br2 as the π-conjugate bridge, denoted as BrFS–TCF, which has the highest electrophilicity of the recognition site, shows a superior nM-level limit of detection (LOD) and an instant response time (<0.1 s) toward AMT. Especially, it shows an excellent selectivity facing the secondary amines, tertiary amines, aromatic amines, and even primary amines. The present strategy would provide a new pathway for chemical substances with similar structures and properties and especially for fighting against illegal drugs.
研究领域:
化学
·
药物分析
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ge Zhang,Hui Zhang,Jie Zhang,Wanchuan Ding,Jingkun Xu,Yangping Wen
A dissolvable conjugated polymer oligo(1-pyreneboronic acid) (OPYBA) as the fluorescent sensor was facilely electrosynthesized for highly selective analysis of Cu 2+ at ultra-trace levels in real samples. OPYBA was obtained by potentiostatical electropolymerization of corresponding monomer at 1.0 V vs. Ag/AgCl in acetonitrile containing tetrabutylammonium tetrafluoroborate and dedoped with dilute HCl. The tetrahydrofuran-solvable OPYBA showed good fluorescent properties and could specifically recognize Cu 2+ , and then it was employed for the quantification of Cu 2+ in linear ranges of 25 pM–88.2 μM and 188 μM–750 μM with a low detection limit of 23 pM. As the fluorescent sensor, OPYBA displayed a high sensitivity and selectivity for Cu 2+ over other substances existing in environment and agro-products such as metal ions, anions, organic acids, amino acids, and carbohydrates. Also, it was used to detect Cu 2+ in tap water, lake water, white rice, Chinese cabbage, and cropland soil samples with satisfactory results, revealing that OPYBA could be as a practical sensing platform for ultra-trace analysis of Cu 2+ in environment and agro-product samples.
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
危险品化学品经营许可证（带存储）