Journal of Environmental Sciences
·
2024
·
IF 5.9
Yongli Liu,Xiaoyan Su,Huanjia Liu,Guifen Zhu,Guobei Ge,Yuxin Wang,Penghui Zhou,Qingxiang Zhou
In present work, blue carbon dots (b-CDs) were derived from ammonium citrate and guanidine hydrochloride, and red carbon dots (r-CDs) were stemmed from malonate, ethylenediamine and meso‑tetra (4-carboxyphenyl) porphin based on facile hydrothermal method . Eco-friendly ratiometric fluorescence probe was innovatively constructed to effectively measure Hg 2+ utilizing b-CDs and r-CDs. The developed probe displayed two typical emission peaks at 450 nm from b-CDs and 650 nm from r-CDs under the excitation at 360 nm. Mercury ion has strong quenching effect on the fluorescence intensity at 450 nm due to the electron transfer process and the fluorescence change at 450 nm was used as the response signal, whereas the fluorescence intensity at 650 nm kept unchangeable which resulted from the chemical inertness between Hg 2+ and r-CDs, serving as the reference signal in the sensing system. Under optimal circumstances, this probe exhibited an excellent linearity between the fluorescence response values of ΔF 450 /F 650 and Hg 2+ concentrations over range of 0.01–10 µmol/L, and the limit of detection was down to 5.3 nmol/L. Furthermore, this probe was successfully employed for sensing Hg 2+ in practical environmental water samples with satisfied recoveries of 98.5%–105.0%. The constructed ratiometric fluorescent probe provided a rapid, environmental-friendly, reliable, and efficient platform for measuring trace Hg 2+ in environmental field.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Huiwen Cai,Mengdi Chen,Fangni Du,Sara Matthews,Huahong Shi
Nanoplastics are an emerging contaminant in aquatic environments. However, analytical methods for the separation, concentration, and identification of nanoplastics, which are essential to assess nanoplastic presence in the environment, are lacking. Here, we developed a new and easy-to-use method to separate and enrich nanoplastics in field water samples with ultracentrifugation. River water was spiked with polystyrene fragments (< 1000 nm) at an environmentally relevant concentration (10 8 –10 9 particles/L). The polystyrene fragments were successfully separated and enriched by a factor of nearly 50 times with a high recovery rate (87.1%) after undergoing our process. Particles were then characterized using UV-vis spectroscopy, scanning electron microscopy (SEM), and enhanced darkfield microscopy with a hyperspectral imaging (HSI) spectrometer. These techniques are non-destructive and allow the assessment of plastic concentration, morphology, and polymer type. Our method can potentially be applied to other water samples to supply clean, enriched nanoplastic samples that can facilitate their identification in environmental samples.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yali Wang,Shuangbo Zhang,Jiang Bian,Joseph Brake,Chaoyang Luo,Chuanwen Sun,Xiaobin Wu
Mercury has caused severe harm to the environment and human health. A novel biological screen method was developed and identified a Hg 2+ chelator BDTH2. Both biological and chemical methods demonstrated BDTH2 displayed a high specificity and strong binding capacity for Hg 2+ . Toxicological experiments of BDTH2 demonstrated its good safety. To enhance the sensitivity, functional composite BDTH2-AuNPs were synthesized, and the system exhibited strong specificity to Hg 2+ and excellent anti-interference capabilities. The optimized colorimetric method and the paper test strip method showed a visual detection limit of 3 nM less than 30 s and 5 nM within 1 min respectively. This system was evaluated for detecting spiked Hg 2+ concentrations in environmental water and six agricultural food samples and showed high consistence with those of ICP-MS. Therefore, this study provides a novel, rapid, and economical method for on-site detecting of Hg 2+ in water and agricultural products.
研究领域:
环境科学
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分析化学
·
毒理学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 18
·7874-7878
·
IF 1.821
Yaping Zhong,Qingpu Wang,Yu He,Yili Ge,Gongwu Song
We developed a simple and sensitive room-temperature phosphorescence (RTP) method for the determination of graphene oxide (GO) in environmental water samples using amino-functionalized silica-encapsulated Mn/ZnS quantum dots (Mn/ZnS@SiO2-NH2) as a phosphorescent probe. The maximum phosphorescence excitation and emission wavelengths of the synthesized Mn/ZnS@SiO2-NH2 nanoparticles were 320 nm and 595 nm. The RTP intensity of the Mn/ZnS@SiO2-NH2 nanoparticles could be quenched in the presence of GO with a detection limit as low as 1.0 mg L−1. Good linear correlations were obtained over the concentration range from 0 to 10.0 mg L−1 with a correlation coefficient of 0.9987, and 10.0 to 25.0 mg L−1 with a correlation coefficient of 0.9979. The phosphorescence quenching mechanism was also discussed. This method was successfully applied to the determination of GO in environmental water samples which allows more opportunities for its application in biological and environmental systems.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 25
·6643-6651
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IF 3.307
Chai Mengsa,Chen Yihui,Xuan Rongrong,Ma Junfeng,Jin Zhenfeng,Wang Tingting,Qiu Dan,Zhang Lihua,Zhang Yukui
A polyethyleneimine (PEI)-modified attapulgite was employed as a new adsorbent for solid-phase extraction (SPE) of chlorophenols (CPs) from environmental water samples. Key factors pivotal to extraction efficiency, such as organic additive, pH, salt, sample loading volume, elution volume, and sample loading flow rate, were investigated. The maximum adsorption capacity of CPs reached 38 mg/g, and the adsorption behavior could be described with the Langmuir isotherm model. The developed SPE procedure was then tested on river water samples. Of this cartridge, 0.4 g could be used to treat up to 100 mL of the water sample, with high recoveries achieved. The limit of detection ( S / N = 3) and the limit of quantification ( S / N = 10) were in range of 0.08–0.56 and 0.27–1.88 ng/mL, respectively. The mean recoveries of CPs spiked in river water samples ranged from 84.4 to 96.8% with relative standard deviations for the intra-day and inter-day less than 6.30%. The developed SPE method exhibited high sensitivity, high selectivity, excellent accuracy, and good repeatability to the analysis of trace CPs in complicated aqueous matrices.
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研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 26
·2943-2950
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IF 2.896
Xinyi Li,Bingzhi Li,Min Chen,Mengmeng Yan,Xiaolin Cao,Jungang Yin,Ziping Zhang
In this paper, magnetic zeolitic imidazolate framework-8 composites were synthesized by a simple in situ method and then used for the first time as an adsorbent in magnetic solid-phase extraction for extracting multiple strobilurin fungicides. The magnetic composites were characterized in detail. The results showed that Fe3O4 nanoparticles were attached on the surface of zeolitic imidazolate framework-8 with a uniform particle size of 150–200 nm and that the magnetic composites possessed a perfect molecular transfer rate towards strobilurin fungicides. The parameters of the magnetic solid-phase extraction process, including solution pH, adsorption time, solution volume, elution solvent, and elution volume, were investigated. Under the optimum conditions, the recoveries of all five fungicides fell within the range 80.8–109.0% with spiking levels of 10, 20 and 50 ng mL−1. A magnetic solid-phase extraction-high performance liquid chromatography-tandem mass spectrometry method based on the magnetic composites was established and confirmed to be simple, time-efficient and highly sensitive.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yinghua Zhu,Youduo Zhao,Jingjing Deng,Tianshu Zhou
The widespread application of neomycin (NEO) has raised pollution problem caused by the accumulation of its residues, which poses potential risk to human health and ecological safety. Therefore, the development of sensitive and reliable approaches is crucial for detecting and monitoring low levels of NEO in complex samples. In this study, an innovative spherical nucleic acid (SNA) based sensor was designed for the selective detection of NEO. The colorimetric response was attributed to hydrogen bonding, electrostatic interaction, and coordination between the SNA and NEO. Meanwhile, the fluorescence of FAM-labeled SNA was quenched by NEO due to fluorescence resonance energy transfer (FRET) effect. By integrating visual colorimetry and fluorescence analysis, the dual-responsive sensor enabled rapid, selective, and sensitive determination of NEO, with detection limits of 40.0 nM and 3.3 nM, respectively. Furthermore, the SNA exhibited good salt tolerance, maintaining stability without aggregation even in high-salt conditions. The average recoveries for detecting NEO in water samples analysis ranged from 97.6 % to 108.7 %, confirming its reliability and accuracy in practical applications. This work provides an effective strategy for NEO detection and expands the potential applications of SNA in environmental monitoring and pollution control.
研究领域:
生物化学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 27
·3402-3407
·
IF 2.073
Mengyu Qi,Chunyan Tu,Yuanyuan Dai,Weiping Wang,Aijun Wang,Jianrong Chen
In this work, an aptamer-based colorimetric method for the detection of tetracycline (TC) was established by employing gold nanoparticles (AuNPs) as the colorimetric probe. In the absence of TC, the aptamers are readily adsorbed on the surface of AuNPs, which prevents aggregation of AuNPs and stabilizes the red colloidal solution against high concentrations of NaCl. In the presence of TC, the aptamers are subsequently released from the surface of the AuNPs due to binding with TC molecules. A gradual color change from red to blue was observed due to the salt-induced aggregation of AuNPs. Furthermore, a linear relationship between the absorbance intensity and the concentration of TC was observed in the range of 0.10 to 5.00 μM. The limit of detection was 0.071 μM. The developed assay was employed for the determination of TC in environmental water samples. The recoveries ranged from 106.7% to 115.6% with relative standard deviations being less than 3.0%. The results demonstrate that the method serves as a promising tool for the rapid, simple and cost-effective detection of TC.
研究领域:
分析化学
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环境科学
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2021
·Vol. 44
·期 18
·3398-3406
·
IF 3.645
Tiantian Pang,Xiaohui Chen,Kai Hu,Yongxia Cui,Wenjie Zhao,Huahui Zeng,Zhenqiang Zhang,Shusheng Zhang
In this study, a new Ti 3 C 2 T x -coated fiber was synthesized and utilized as coatings for solid-phase microextraction of seven polychlorinated biphenyls. The as-produced multilayered Ti 3 C 2 T x MXene was characterized by X-ray diffractometer, thermos-gravimetric analysis, scanning electron microscopy, and energy dispersive spectroscopy. It is noteworthy that the Ti 3 C 2 T x showed some attractive features including unique 2D layered structures, large surface area, good hydrophilicity, and rich active recognition sites, endowing it has a high affinity towards the target polychlorinated biphenyls. Subsequently, the affecting parameters on the extraction efficiency of polychlorinated biphenyls were optimized. Under the optimal conditions, a novel method for the analysis of polychlorinated biphenyls in water samples was proposed. The Ti 3 C 2 T x -coated fiber-based solid-phase microextraction method showed good linearity ( r 2 > 0.9928), high enrichment factors (268–442), low limits of detection (0.06–0.15 ng/L), and satisfactory repeatability (RSDs < 7.5%) for the polychlorinated biphenyls. The excellent method recoveries were in the range of 90.0–98.4, 92.0–98.2, and 92.0–98.0% for river water, lake water, and tap water samples, respectively. These results suggested that the proposed Ti 3 C 2 T x -coated fiber-based method represents a promising alternative for the analysis of polychlorinated biphenyls.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Lin Zhang,Beibei Chen,Man He,Xiaolan Liu,Bin Hu
In this study, the hydrophilic polymer monolithic capillary (poly(acrylamide-vinylpyridine-methylene bis(acrylamide)), poly(AA-VP-Bis)) was prepared for the separation and enrichment of carboxyl group-containing gold nanoparticles (Au NPs) from environmental waters followed by online ICPMS determination. The extraction mechanism of the prepared poly(AA-VP-Bis) monolithic capillary for Au NPs is based on the static electrical and hydrogen bond interactions between the carboxyl group on the surface of Au NPs and pyridine/amide groups on the surface of the monolith. Under the optimal conditions, a detection limit of 24.2 fmol L–1 and a sample throughput of 6 h–1 were achieved for 3 nm citrate stabilized Au NPs, and the original morphology of the Au NPs could be maintained during the extraction process. The developed method was successfully applied for the analysis of carboxyl group-containing Au NPs in environmental water samples, such as tap water, the Yangtze River water, and the East Lake water, with recoveries in the range of 77–103%. Compared with the reported approaches for analysis of Au NPs, this method is an online strategy for carboxyl group-containing Au NPs determination and has the merits of low detection limit, small sample consumption, fast extraction/desorption kinetics, wide linear range, high selectivity, and high throughput.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2016
·Vol. 4
·期 2
·493-502
·
IF 5.896
Jialuo Yu,Xiaoyan Wang,Qi Kang,Jinhua Li,Dazhong Shen,Lingxin Chen
A novel molecular imprinting fluorescence nanosensor was constructed via a facile surface imprinting polymerization one-pot synthesis strategy for highly selective and sensitive recognition and detection of 4-nitrophenol (4-NP) based on an electron-transfer induced fluorescence quenching mechanism. 2-Aminoethyl methacrylate hydrochloride (AMA) was first used as a surfactant to interact with aqueous carboxyl-CdTe quantum dots (QDs) and the resultant AMA-modified QDs were used as a core support and a fluorescent signal source. Then, an ultrathin 4-NP imprinted shell (ca. 4 nm) was formed on the QD surface (i.e., QD@MIPs) by a simple facile free radical polymerization step. The one-pot synthesis simplified the imprinting process and shortened the experimental period. The imprinted sites bound the template of 4-NP efficiently through the hydrogen bonding interactions and showed excellent recognition selectivity for 4-NP over its analogues with a high imprinting factor of 9.1. The electron transfer process between QDs and 4-NP led to significant fluorescence quenching of the QD@MIPs nanosensor, by which 4-NP could be sensed, and high detection sensitivity up to 0.051 μM was attained. Furthermore, the sensor was successfully applied to determine 4-NP in seawater and lake water samples, presenting high recoveries in the range of 92.7–109.2% at three spiking levels with the relative standard deviation within 3.1–4.8%. The simple, rapid, reliable QD@MIPs-based method proved to be potentially applicable for the highly selective and sensitive fluorescence determination of trace 4-NP in complicated environmental water samples.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yi He,Xianhui Zhang
We report a facile, selective, and sensitive colorimetric assay for Mn 2+ ions based on the anti-aggregation of unmodified silver nanoparticles (AgNPs). In the absence of Mn 2+ ions, the addition of l -arginine to the AgNPs dispersion caused the aggregation of AgNPs via Ag–N covalent interaction, and the color of the solution changed from yellow to colorless. While the presence of Mn 2+ ions can prevent the aggregation of AgNPs due to the formation of the complex between Mn 2+ ions and l -arginine, accompanying with a distinct color change from colorless to yellow with the increase of Mn 2+ ions. Under the optimal experimental conditions, the absorbance at 390 nm was linearly proportional to the Mn 2+ ions concentration in the ranges from 0 to 700 nM, and from 5 μM to 70 μM, with a detection limit of 20 nM. Also, it was successfully used for the detection of Mn 2+ ions in environmental water samples.
研究领域:
分析化学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）