MARINE CHEMISTRY
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2019
·
IF 2.713
Yuxi Lu,Xuelu Gao,Chen-Tung Arthur Chen
In this study, a method was developed for the desalination and pre-concentration of three colloidal trace metals in seawater , namely Cd, Cu and Pb, using diethylammonium diethyldithiocarbamate and ammonium 1-pyrrolidine dithiocarbamate as chelates. Seawater samples were first treated with cross-flow ultrafiltration (CFUF) for the separation of the colloidal matter of different molecular weights , i.e. 1–3 kDa, 3–10 kDa and 10 kDa-0.22 μm. Then, after acid digestion , the organic chelates and the extracting agent chloroform were added at pH = 3.8. Finally, the organic phase was back extracted, and the target metals in all samples were measured using inductively coupled plasma mass spectrometry (ICP-MS) with low detection limits in the range of 0.13–1.18 pmol L −1 . The extraction efficiencies for the three metals were in the range of 92.2%–100.3% with an enrichment factor of 40, and their mass recoveries in the studied colloidal fractions were in the range of 83.1%–103.5%. The developed method has been successfully applied for the analysis of seawater samples collected from the sites off the south coast of North Yellow Sea in Shandong Peninsula , China. For the first time, the distribution of colloidal Cd, Cu and Pb in different molecular weights in this area is reported. The results obtained from real samples demonstrate that the developed method is simple, efficient and convenient for routine analysis with low detection limit.
研究领域:
海洋化学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Science
·
2024
·
IF 32.4
Wenhua Xue,Jian Ye,Zhi Zhu,Reeti Kumar,Jun Zhao
The photocatalytic conversion of biomass into valuable chemicals offers a more energy-efficient and low-carbon alternative to traditional thermal catalysis, representing a promising strategy for fine chemical production without relying on fossil fuels. While most studies have focused on catalyst design to improve efficiency, the precise tuning of solvents has been neglected. This study examines the conversion of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF) as a representative biomass alcohol oxidation reaction, revealing a novel strategy for enhancing photocatalytic efficiency through solvent fine-tuning. The introduction of minute quantities of water into an acetonitrile solvent matrix during the HMF oxidation reaction was observed to engender pronounced enhancements in catalytic performance, with the degree of effect contingent on precise water concentration. Trace water is an active participant in the catalytic cycle, diminishing the activation energy barrier for bond cleavage and averting catalyst deactivation. This mechanism also proved applicable to other photocatalysts and various alcohol substrates, highlighting the potential of this strategy for enhancing photoenergy utilization and reaction efficiency.
研究领域:
化学工程
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可再生能源
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Zhou Fang,Ying Su,Yaqin Yu,Huaijian Zhang,Xintian Qian
Diffusive Gradients in Thin-films (DGT) technique is a promising passive sampling technique, which was used for the determination of lots of inorganic and organic pollutants. Although many DGT devices have not been extensively tested and verified in field, DGT device such as LSNP-NP, LSNT-NP, LSNZ-NP, and LSNM-NP DGT were widely employed for the assessment of various trace elements. However, the deployment time of these DGTs were much shorter than the theoretical time in the preexisting literature. Therefore, the performance of DGT for long-term application in different water bodies is not known. This investigation utilized the four DGTs for the assessment of various trace elements across extended periods both in controlled laboratory settings and natural field environments. Synthetic soft, hard, and seawater compositions served as media for laboratory deployments. Most elements can be measured accurately in 4–7 days in soft and hard water. Deployment durations in seawater exhibited a notable reduction compared to those in freshwater matrices. LSNZ-NP DGT excelling in oxyanion determination, while LSNT-NP DGT showcased superior efficacy in phosphorus quantification. Field deployments in rivers and sea affirmed the robustness of LSNZ-NP DGT, evidencing prolonged deployment capabilities for various elements, such as Mo, Se, As, Sb, and P, spanning 7–28 days. Assessment of pollution levels across four sampling sites revealed heightened concentrations of most elements in marine waters relative to riverine environments, except for phosphorus. Notably, all assessed elements, except for phosphorus, conformed to Class I water quality standards. This study demonstrated the difference between the theoretical application time and actual application time for the first time. It raises new questions for the application of DGT in nature water bodies. The mechanization of the difference between the theoretical and actual application time should be studied in the future research. The measures to extend the application time should be studied too.
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
CHEMOSPHERE
·
2019
·
IF 5.108
Jing Zou,Huahua Cai,Daiyao Wang,Junyang Xiao,Zhenming Zhou,Baoling Yuan
A low-cost and environmentally-friendly spectrophotometric method for hydrogen peroxide (H 2 O 2 ) determination based on the oxidative coloration reaction of N,N′ -diethyl- p -phenylenediamine (DPD) via the Fenton reactions in aqueous water was established. The generated pink radical cation (DPD + ) showed maximum absorption at 551 nm. Importantly, under the optimal conditions (pH 3.0, 20 mM DPD, 1.5 mM Fe(II) and reaction time of 45 s), the increase in absorbance at 551 nm for DPD + generation was linear with respect to the addition of H 2 O 2 (0–12 μM). The sensitivity and the detection limit of the proposed Fenton-DPD method for H 2 O 2 determination at 551 nm were (2.55 ± 0.01) × 10 4 M −1 cm −1 and 0.05 μM, respectively. The stoichiometric factor for the reaction of H 2 O 2 with DPD was 1:1.18. The absorbance of the generated DPD + was found to be stable in different types of water within 20 min. Moreover, the proposed Fenton-DPD method could be used for the analysis of the trace H 2 O 2 in rainwater and determine the rate constants that involved H 2 O 2 with high accuracy.
研究领域:
分析化学
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环境科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Ruilin Liu,Xiaoping Wei,Jianping Li
An amperometric method with synergistic electrocatalysis on photoelectrocatalysis was proposed, and it was used for the detection of trace glucose concentrations for the first time. Under illumination of an external xenon lamp light source, the electrocatalytic oxidation reaction of glucose on a Co 3 O 4 -modified electrode produced a synergistic effect on the photoelectrochemical reaction of glucose. The separation of electron–hole pairs generated by the photoelectrochemical reaction was promoted, and the photoelectric conversion efficiency was improved. As a result, the photoelectric current increased, and the sensitivity of the amperometric method was enhanced by about 9 times. The mechanism of synergistic electrocatalysis on photoelectrocatalysis was studied. The method can be used for the determination of glucose with a linear concentration range of 1.0 × 10 −8 M to 3.5 × 10 −7 M. The sensitivity was 7,753 μA cm −2 mM −1 , and the detection limit was 3.6 × 10 −9 M. Compared with conventional photoelectrochemical analysis methods, the chronoamperometric method has higher sensitivity and lower detection limit. The method has been used for the direct determination of trace amounts of glucose in saliva and sweat.
研究领域:
分析化学
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生物医学工程
✓ 已验证
DOI
高影响因子
PLoS One
·
2017
·Vol. 12
·期 9
·e0185302
·
IF 2.806
FuKai Li,AiJun Gong,LiNa Qiu,WeiWei Zhang,JingRui Li,Yu Liu,YuNing Liu,HuiTing Yuan
The determination of trace rare-earth elements (REEs) can be used for the assessment of environmental pollution, and is of great significance to the study of toxicity and toxicology in animals and plants. N, N, N′, N′-tetraoctyl diglycolamide (TODGA) is an environmental friendly extractant that is highly selective to REEs. In this study, an analytical method was developed for the simultaneous determination of 16 trace REEs in simulated water samples by inductively coupled plasma optical emission spectroscopy (ICP-OES). With this method, TODGA was used as the extractant to perform the liquid-liquid extraction (LLE) sample pretreatment procedure. All 16 REEs were extracted from a 3 M nitric acid medium into an organic phase by a 0.025 M TODGA petroleum ether solution. A 0.03 M ethylenediaminetetraacetic acid disodium salt (EDTA) solution was used for back-extraction to strip the REEs from the organic phase into the aqueous phase. The aqueous phase was concentrated using a vacuum rotary evaporator and the concentration of the 16 REEs was detected by ICP-OES. Under the optimum experimental conditions, the limits of detection (3σ, n = 7) for the REEs ranged from 0.0405 ng mL -1 (Nd) to 0.5038 ng mL -1 (Ho). The relative standard deviations (c = 100 ng mL -1 , n = 7) were from 0.5% (Eu) to 4.0% (Tm) with a linear range of 4–1000 ng mL -1 (R 2 > 0.999). The recoveries of 16 REEs ranged from 95% to 106%. The LLE-ICP-OES method established in this study has the advantages of simple operation, low detection limits, fast analysis speed and the ability to simultaneously determine 16 REEs, thereby acting as a viable alternative for the simultaneous detection of trace amounts of REEs in water samples.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
XianWei Wang,Yue Zhai,Yuanhui Chen,Wei Zhang,Pei Liang,Qiangqiang Zhu,Hong Zhang,Juan Kang,Le Wang
s The development of a highly sensitive and reliable surface-enhanced Raman scattering (SERS) substrate is crucial for overcoming the limitations in its practical applications. Herein, a novel 3D waffle-like SERS substrate with high activity is constructed for detecting trace amounts of myricetin in complex analytes extracted from green tea. The substrate is achieved through a layered ternary film structure, where ordered poly (methyl methacrylate) opal photonic crystals (PMMA OPCs) serving as a 3D hot spots template and enhancing the performance of CsPbBr 3 film that facilitates efficient charge transport, and an Au film covered over the CsPbBr 3 film modulating the vibronic coupling and providing plasmonic hot spots. The PMMA-CsPbBr 3 -Au substrate exhibits a low detection limit of 10 −10 M with an 8.9 × 10 7 enhancement factor, signal repeatability and stability for R6G molecules. Furthermore, the SERS detection of myricetin content in Longjing green tea from different years is carried out, and the results show a good linear positive correlation with storage years (R 2 =98.2 %), demonstrating the potential application of 3D substrate for sensitive and reproducible SERS.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Cong Guan,Jiaming Cai,Xiaotao Liu,Liangqia Guo
The detection of trace water (H 2 O) content is important and challenging in food and food-related industries. Herein, highly crystalline two-dimensional covalent organic frameworks (TAPT-BTCA-COF) with yellow-green fluorescence were prepared by using 1,3,5-tris(4-aminophenyl)triazine (TAPT) and 1,3,5-benzenetricarboxaldehyde (BTCA) as precursors. The fluorescence of TAPT-BTCA-COF is sensitive to the solvent polarity due to the intermolecular charge transfer (ICT) effect and can be quenched by trace H 2 O due to the block of ICT effect by H 2 O. On this base, TAPT-BTCA-COF is applied for sensing of trace H 2 O in common organic solvents such as DMF, acetonitrile , THF and acetone with fast response and high sensitivity. The limits of detection for H 2 O in DMF, acetonitrile, THF and acetone are 0.082 wt%, 0.0053 wt%, 0.0091 wt% and 0.0061 wt%, respectively. Furthermore, a ratiometric fluorescent sensor is proposed by using TAPT-BTCA-COF as the signal probe and red fluorescent tris(2,2′-bipyridyl)ruthenium(II) dichloride as the reference and successfully applied for quantitatively and semi-quantitatively sensing of trace H 2 O in honey sample and the moisture in N 2 gas.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 13
·4294
·
IF 4.927
Hui Li,Fei Li,Fang Liu,Xiao Chen,Wenyuan Xu,Liang Shen,Jingkun Xu,Rui Yang,Ge Zhang
In view of that conjugated polymers (CPs) are an attractive option for constructing high-sensitive Cr2O72−sensors but suffer from lacking a general design strategy, we first proposed a rational structure design of CPs to tailor their sensing properties while validating the structure-to-performance correlation. Short side chains decorated with N and O atoms as recognition groups were instructed into fluorene to obtain monomers Fmoc-Ala-OH and Fmoc-Thr-OH. Additionally, their polymersP(Fmoc-Ala-OH)andP(Fmoc-Thr-OH)were obtained through electrochemical polymerization.P(Fmoc-Ala-OH)andP(Fmoc-Thr-OH)with high polymerization degrees have an excellent selectivity towards Cr2O72−in comparison to other cations and anions. Additionally, their limit of detection could achieve 1.98 fM and 3.72 fM, respectively. Especially, they could realize the trace detection of Cr2O72−in agricultural products (red bean, black bean, and millet). All these results indicate that short side chains decorated with N and O atoms functionalizing polyfluorene enables the ultra-trace detection of Cr2O72−. Additionally, the design strategy will spark new ideas for the construction of highly selective and sensitive Cr2O72−sensors.Keywords:Cr2O72−;design strategy;conjugated polymer;ultra-trace detection;agricultural products
研究领域:
化学传感器
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 21
·e202200985
·
IF 4.782
Zhuanzhuan Shi,Liang Liu,Yuan Li,Xiaoshuai Wu,Yunpeng Li,Qingyuan Li,Xijuan Hao,Chang Ming Li,Chunxian Guo
Graphical Graphdiyne is firstly explored for high selectivity direct electrochemical sensing of Cu 2+ , achieving a wide detection range of 0.25–380 μM and a trace level as low as 8 nM. This high performance is attributed to the unique C≡C structure of GDY, which possesses both chelating and reducing abilities to anchor and reduce Cu 2+ to Cu + . Graphdiyne (GDY), an emerging type of carbon allotropes with unique sp−sp 2 carbon atoms, is firstly explored for high selectivity direct electrochemical sensing of ultra-trace level copper ions (Cu 2+ ). It achieves a wide detection range of 0.25–380 μM and a trace level as low as 8 nM, among the best performance of reported carbon-based sensors. It is found that GDY with unique C≡C possesses both chelating and reducing abilities to efficiently anchor and reduce Cu 2+ to Cu + , eventually leading to ultrasensitive detection.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Yang Jia,Jian-Bo Chen,Xiaolin Fu,Zhenxing Cui,Siqi Zhuang,Ling Chen,Bo Jin,Yu Liu
1,3,5-trinamino-2,4,6-trinitrobenzene (TATB) as an important insensitive high explosive has excellent safety performance due to strong hydrogen bonds. Ionic impurities including sulfate ions (SO 4 2− ), nitrate ions (NO 3 − ) and chloride ions (Cl − ) formed during the preparation of TATB have negative effects on TATB-based explosives. However, strong hydrogen bonds result in extremely low solubility of TATB in traditional solvents, which poses a huge obstacle to extract and detect the impurities in TATB for quality control. In this study, a green extraction method based deep eutectic solvent (CS-1) was firstly developed for the extraction of trace impurities in TATB. After the dissolution of TATB in CS-1 solvent, water (H 2 O) was used as a green hydrogen bond donor to differentiate the solubility between TATB and its ionic impurities. Through the above strategy, TATB was efficiently removed and the impurities were selectively extracted in CS-1 solvent. Meanwhile, Ca(OH) 2 as a precipitant was investigated to eliminate the background interference of F − ions in CS-1 solvent through forming the precipitate of CaF 2 . Further, the extraction of deep eutectic solvent was combined with ion chromatography (IC) to develop an analytical method for trace impurities. This method displays excellent separation, high sensitivity and good repeatability toward four ionic impurities (Cl − , NO 2 − , NO 3 − and SO 4 2− ). Compared to traditional methods (DMSO method and oxygen flask combustion method) with low extraction ability, indirect detection and dangerous pretreatment, this method provides direct, convenient and accurate detection of anionic impurities in TATB, and displays better application for quality control of TATB.
研究领域:
化学
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分析化学
·
爆炸物科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jie Zhang,Meng-Ping Ren,Man Xu,Zhonghui Zhang,Mingxue An,Yang Lu,Xiao-Wu Lei,Zhongliang Gong,Cheng-Yang Yue
A quantitative water detection method is urgently needed in storage facilities, space exploration, and the chemical industry. Although numerous physical techniques have been widely utilized to determine the water content, they still suffer from many disadvantages such as highly expensive special instruments, complicated analysis processes, etc. Hence, a convenient, rapid, and sensitive water analysis method is highly desirable. Herein, we developed a visual fluorescence sensing technology for water detection based on reversible PL off-on switching of organic–inorganic hybrid zero-dimensional (0D) manganese halides. In this work, a family of hybrid manganese halides were synthesized through a facile solution method, namely, [NH4(18-Crown-6)]2MnBr4, [Ca(18-Crown-6)·3H2O](18-Crown-6)MnBr4, [NH4(dibenzo-18-Crown-6)]2MnBr4, and [Ca(dibenzo-18-Crown-6)·2H2O]MnBr4. Excited by UV light, these highly crystalline manganese halides exhibit strong green light emissions from the d–d electron transition of Mn2+ with near-unity photoluminescence quantum yield and submillisecond lifetime. Benefiting from the dynamic and weak ionic bonding interactions, these 0D manganese halides display reversible water-response on/off luminescence switching but fail in any other aprotic solvents. Therefore, these 0D hybrid manganese halides can be explored as ultrafast visual fluorescence probes to detect the trace amount of water in organic solvents with multiple superiorities of rapid response time (< 2 s), ultralow detection limit (9.71 ppm), excellent repeatability, etc. The reversible water-response luminescent on/off switching also provides a binary optical gate with advanced applications in anticounterfeiting and information security, etc.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）