Analytical Methods
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2016
·Vol. 8
·期 13
·2723-2728
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IF 1.915
Yongming Guo,Lianfeng Zhang,Fengpu Cao,Lianghong Mang,Xiaoling Lei,Shengjuan Cheng,Jintong Song
A facile, sensitive and selective method for the fluorescent detection of hypochlorite in tap water has been developed by utilization of blue-emissive silicon quantum dots (SiQDs) with a quantum yield of 10.6%. The SiQDs are prepared via a simple hydrothermal treatment of (3-aminopropyl)trimethoxysilane and sodium citrate, and they display excellent stability in high salt conditions. The proposed preparation method for SiQDs does not require complicated synthesis and does not need the protection of an inert gas. It is attractive that the as-prepared SiQDs can be utilized to detect hypochlorite in tap water with relatively good selectivity and sensitivity, and as low as 0.01 μM hypochlorite could be successfully determined.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 107
·105795-105800
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IF 3.289
Lanfang Pang,Yanmei Zhou,Wenli Gao,Haohan Song,Xiao Wang,Yong Wang
The 7-hydroxy-4-methylcoumarin as an “off–on” fluorescent probe exhibited excellent selectivity and sensitivity towards hypochlorite over other reactive oxygen species and relevant ions. Upon treatment with hypochlorite, the fluorescence intensity of the probe gradually increased 86-fold. A good linear increase of the fluorescence intensity could be observed with increasing hypochlorite concentration over a wide linear range of 0–150 μM, and a detection limit as low as 67 nM was obtained. Moreover, the probe could also be successfully applied for the detection of hypochlorite in tap water and living cells, which provided great potential for the quantitative detection of hypochlorite in water samples and cancer cells.
研究领域:
分析化学
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生物化学
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医学检测
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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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
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环境科学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2017
·Vol. 409
·期 30
·7133-7144
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IF 3.431
Zhang Chao,She Yongxin,Li Tengfei,Zhao Fengnian,Jin Maojun,Guo Yirong,Zheng Lufei,Wang Shanshan,Jin Fen,Shao Hua,Liu Haijin,Wang Jing
An electrochemical sensor based on molecularly imprinted polypyrrole (MIPPy) was developed for selective and sensitive detection of the herbicide glyphosate (Gly) in cucumber and tap water samples. The sensor was prepared via synthesis of molecularly imprinted polymers on a gold electrode in the presence of Gly as the template molecule and pyrrole as the functional monomer by cyclic voltammetry (CV). The sensor preparation conditions including the ratio of template to functional monomers, number of CV cycles in the electropolymerization process, the method of template removal, incubation time, and pH were optimized. Under the optimal experimental conditions, the DPV peak currents of hexacyanoferrate/hexacyanoferrite changed linearly with Gly concentration in the range from 5 to 800 ng mL −1 , with a detection limit of 0.27 ng mL −1 ( S/N = 3). The sensor was used to detect the concentration of Gly in cucumber and tap water samples, with recoveries ranging from 72.70 to 98.96%. The proposed sensor showed excellent selectivity, good stability and reversibility, and could detect the Gly in real samples rapidly and sensitively.
Schematic illustration of the experimental procedure to detect Gly using the MIPPy electrode
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Xiong Zengheng,Wu Yan,Zhou Yang,He Shuhai,Huang Danyu,Zhang Mingshan,Jiang Yanjun,Cheng Long,Zhao Zhendong,Zhao Hongwei,Lin Huan
Neonicotinoids (NEOs) pesticides are widely used around the world, especially in the tropics with greater frequency and intensity. However, little is known about NEOs residue in drinking water of tropics. In this study, a highly efficient method using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was established for determining eight NEOs in source water and tap water of Hainan Island, China. The method adopted a high-throughput direct aqueous injection without sample concentration steps, with a rapid analyzing period of 5.0 min, method detection limits (MDLs) in the range of 0.84–1.82 ng/L and the average recoveries ranged from 83% to 116%. NEOs were detected in all source water samples and at an upper level as compared with other parts of China. The most frequently detected NEO was imidacloprid with a detection frequency of 94%, followed by clothianidin (88%) and thiamethoxam (78%), with maximum concentrations of 86.4, 164, and 188 ng/L, respectively. Moreover, seasonal and spatial variations had remarkable impacts on NEO contamination in source water. Drinking water treatment processes removed approximately 20% of NEOs from surface water. However, 90% of tap water samples contained at least one NEO, With 3 samples’ concentration of single NEO exceeding the acceptable value recommended by the European Union (100 ng/L). Therefore, the risk of human exposure through drinking water was evaluated for 4 age group and 2 genders. Young children aged 9 months to 3 years old were found to have the highest risk, with the median exposure up to 4 times greater than teenagers and adults. Next, water intake is likely only a small part of the daily intake of these individuals, thus the potential health problems caused by NEOs present in the tap water of Hainan should not be ignored.
研究领域:
环境科学
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毒理学
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公共卫生
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Danyang Tao,Rong Wang,Si Shi,Lifen Yun,Rui Tong,Yue'e Peng,Wei Guo,Yanfeng Liu,Shenghong Hu
In this paper, a comprehensive method for the identification of the unknown halogenated DBPs (X-DBPs, X = Cl, Br, and I) in the tap water of Wuhan, China via liquid chromatography-high resolution mass spectrometry (LC-HRMS) was developed. 123 X-DBPs were identified through the stepwise procedure, 94 of them were newly identified, and 3 of them were confirmed by standards. Most X-DBPs were aliphatic compounds and highly unsaturated and phenolic compounds , some X-DBPs contained multiple halogen atoms and rich in carboxyl groups , such as C 2 H 2 O 2 BrCl, C 2 H 2 O 2 Br 2 , and C 2 H 2 O 2 ClI. It was worth noting that the concentration of some X-DBPs had the same trend with time. Most Cl-DBPs remained stable and I-DBPs were detected occasionally by monitoring the change of concentration of these X-DPBs with the time during three consecutive months. The results demonstrate that the proposed method could provide valuable molecular formula and structure information on unknown multiple halogenated DBPs, or be used for the identification of other multiple halogenated organic compounds in different media.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
CHROMATOGRAPHIA
·
2024
·
IF 1.2
Huang Zhongping,Wu Ermiao,Shi Dongliang,Zhang Jingkun,Shen Zhenlu,Zheng Ruixing,Shen Jian
The quantification analysis of microplastics (MPs) in bottled water, purified tap water and branded table salt was executed by double-shot pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS), and the concentration was expressed as a mass concentration, which was more suitable for the data comparison. MPs including polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polystyrene (PS) and polyethylene (PE) were separated by filtration with glass fiber filter membranes. After being folded, the whole glass filter membrane containing MPs was transferred into a pyrolysis cup directly to avoid the sample loss during transfer. The characteristic pyrolysates were used to identify and quantify PMMA, PET, PC, PP, PS and PE. The linear relationships were found between the polymer weight amount and peak areas of each characteristic pyrolysates with the correlation coefficients larger than 0.993. The intra-day precisions of the pyrolysates for peak areas were 0.56–18.94%, and the inter-day variability was 8.47–19.88%. The recovery values of the spiked standards were in a range of 81.5–114.5%. MPs in bottled water, purified tap water and branded table salt samples were successfully quantified by the proposed Py–GC/MS method. For four brands of bottled water samples, 0.088 μg/L PET was found in one sample. PP was detected in all purified tap water samples from five brands with the concentrations between 0.028 and 0.489 μg/L, and PE was detected in purified tap water samples from two brands with the concentrations between 0.194 and 1.26 μg/L. As for nine table salt samples, PP were found in a range of 4.00–182.80 μg/100 g salt in eight table salt samples. Due to the high content of MPs in purified tap water samples and large daily consumption, the estimated daily intake (EDI) of MPs from purified tap water was calculated. The estimated daily intakes (EDIs) for adults are 2.57 ng PP/kg/d and 4.17 ng PE/kg/d from purified tap water; the EDIs for children are 5.63 ng PP/kg/d and 9.11 ng PE/kg/d from purified tap water.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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2020
·Vol. 187
·期 8
·1-8
·
IF 6.232
Yan Fei,Ma Xinyu,Jin Qifan,Tong Yun,Tang Hongliang,Lin Xingyu,Liu Jiyang
The selective electrochemical determination of fluoride is reported by phenylboronic acid-functionalized vertically ordered mesoporous silica film attached to the indium tin oxide electrode, designed as PBA-VMSF/ITO. Fluoride ion can selectively bind to phenylboronic acid to generate boronate anions, leading to negative charges inside the ultrasmall nanochannel of VMSF and ultimately rejecting the access of potassium ferricyanide ions to the electrode surface. By recording the reduced electrochemical signal of potassium ferricyanide, determination of fluoride ion in aqueous solution was achieved with a fast response, wide response range, and high selectivity. Furthermore, with the specific recognition of PBA and anti-fouling ability of VMSF, the PBA-VMSF/ITO sensor has been successfully used to detect fluoride ion in tap water.
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Xiuxiu Yang,Zhongqiang Yang
This work established a liquid crystal (LC) aptasensor for simple and rapid detection of ibuprofen, a typical pharmaceuticals and personal care products (PPCPs) pollutant. A negatively charged DNA aptamer specific for ibuprofen and a positively charged amphiphilic surfactant, hexadecyltrimethylammonium bromide (CTAB), were incubated with the sample and then directly added onto the LC interface. In the presence of ibuprofen, the specific binding of ibuprofen with the DNA aptamer will release CTAB, which then adsorbed at the LC–aqueous interface and induced the orientational change of LCs to homeotropic orientation with a dark optical signal output. While in the absence of ibuprofen, the DNA aptamer binds with CTAB through hydrophobic and electrostatic interactions, LCs remained in the planar orientation with a bright optical signal output. This LC aptasensor also has good specificity for ibuprofen and can even detect ibuprofen drug in tap water. Moreover, the response time of the LC aptasensor is fast in minutes. Additionally, this LC aptasensor benefits in monitoring the water quality and inspires the exploration of a general platform for PPCPs detection.
研究领域:
分析化学
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环境科学
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传感技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
·
2020
·
IF 0.992
Hao Zhang,Juan Wei,Zongli Huo
A simple and rapid method employing ultra-high performance liquid chromatography tandem mass spectrometry has been developed for the direct determination of acrylic acid in tap water for the first time. The method worked on a ultra-high-performance liquid chromatography system and utilized the direct injection of 10 μL volumes. Aqueous samples were filtered with 0.22 μm membrane after diluting with the acetonitrile without any further pretreatment. The separation was accomplished by using a HILIC column with a gradient elution program. Acetonitrile and ammonium acetate solution (pH = 7) were applied in the method as the mobile phase. Acrylic acid- d3 was used as the internal standard in the quantification process. The method provided good recovery from 102.8% to 104.4%, good precision with intraday relative standard deviations in a range of 2.3% and 5.1%. The limit of quantification for the method was 45 μg/L. The possible structures of qualitative ion and quantitative ion of acrylic acid were proposed in this work with the help of the product ion spectra of acrylic acid and its corresponding isotopic standards. This study provided a reliable and quantitative method that could be used for daily monitoring of water quality.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Zhiping Zhou,Tao Li,Wanzhen Xu,Weihong Huang,Ningwei Wang,Wenming Yang
In this paper, based on Mn doped ZnS quantum dots (QDs) and by anchoring a MIPs layer on the surface of SiO 2 nanoparticles, the novel fluorescence molecularly imprinted polymers (SiO 2 @QDs@MIPs) were successfully synthesized by precipitation polymerization, with acrylamide (AM) as the functional monomer and ethyl glycol dimethacrylate (EGDMA) as the cross-linker. The prepared SiO 2 @QDs@MIPs were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermo gravimetric analysis (TGA) and fluorescence spectroscopy. The products show excellent optical properties and molecular recognition ability of molecularly imprinted polymers. It can recognize sensitively and selectively the template molecules, dibutyl phthalate (DBP). Under optimized experiment conditions, the fluorescence intensity decreases linearly with increasing concentration of DBP. in the range of 5–50 μmol L −1 , with a correlation coefficient of 0.9974. Furthermore, the SiO 2 @QDs@MIPs were successfully applied to analysis of tap water sample, and the average recovery rate of DBP at three spiking levels is more than 97.80%, with RSD below 3.25%. This study provides a promising strategy to fabricate fluorescent molecular imprinting polymer with highly selective recognition ability.
研究领域:
材料科学
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环境科学
·
分析化学
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产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 10
·4055-4058
·
IF 1.821
Yongming Guo,Qinge Ma,Fengpu Cao,Qiang Zhao,Xuewei Ji
We have developed a simple method for the colorimetric detection of hypochlorite in tap water based on the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB). In aqueous solution at pH 4.0, hypochlorite, an oxidant, rapidly converts colourless TMB to a blue oxidized form. The presence of hypochlorite in tap water can in this way easily be detected with the naked eye, based on the obvious colour change. The system can detect concentrations of hypochlorite as low as 0.05 μM with an excellent linear relationship and good selectivity.
研究领域:
分析化学
·
环境监测
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生物传感
·
水处理
·
分子诊断
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）