WATER RESEARCH
·
2021
·
IF 11.236
Ruya Chen,Guiwei Li,Yitian He,Linlin Pan,Ying Yu,Baoyou Shi
Perfluoroalkyl substances (PFASs) can occur in water sources, pass through drinking water treatment plants (DWTPs), drinking water distribution systems (DWDSs), to the consumer taps. This investigation was carried out to present the transportation behaviors of 17 PFASs, involving seven DWTPs with different water sources, raw water transportation modes, treatment processes, and DWDS structures in eastern and northern China. The results showed that the long-distance raw water transportation pipelines removed a certain extent of PFASs from raw water, probably due to the accumulation of loose deposits. The long-distance, open-channel South-to-North water diversion increased PFAS contamination risk. In the DWTPs, granular activated carbon (GAC) adsorption and ultraviolet radiation removed less than 25% of PFASs, but ozonation-biological activated carbon (O 3 -BAC) was superior to GAC alone in removing PFASs. Loose deposits couldsignificantly influence PFAS accumulation and release within branch-structured DWDSs. In loop-structured DWDSs, finished water with different PFAS characteristics could mix along the pipeline, with the corresponding DWTP as the center, ultimately forming a relatively uniform distribution in the entire DWDS.
研究领域:
环境科学
·
公共卫生
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·3781-3787
·
IF 4.58
Zhang Pu,Wang Yi,Chen Ling,Yin Yibing
Gold-silver nanoclusters (Au-AgNCs) were synthesized by simultaneous chemical reduction of Au(III) and Ag(I) ions in one pot, using bovine serum albumin as both a template and a reductant. The Au-AgNCs have an average size of 2.4 nm and display strong red fluorescence (with an emission peak at 610 nm on excitation at 360 nm). The fluorescence quantum yield can reach 18.6%. Fluorescence is strongly quenched by hypochlorite, while other common anions have minor (or no) effects on fluorescence. Based on these findings, a fluorometric method was developed for the determination of hypochlorite. The method has a linear response in the 0.7 to 15 μM concentration range, with a limit of detection as low as 80 nM. It was successfully applied to the determination of hypochlorite in (spiked) tap water.
Gold-silver nanoclusters with strong red fluorescence were synthesized by simultaneous chemical reduction of Au(III) and Ag(I) ions in one pot, and a sensitive and selective method for the detection of hypochlorite was developed based on the quenching of the fluorescence of the nanoclusters.
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2023
·Vol. 77
·期 10
·5873-5880
·
IF 2.2
Zhou Jialin,Fei Jiayu,Zeng Cheng,Quan Hong Hua,Li Ming
Stably retaining the water-soluble molybdate within electrodes is of great significance in phosphate analysis. This study fabricated an [Omim] 6 Mo 7 O 24 carbon paste electrode (OCPE), which was able to effectively retain molybdate in the aqueous solution. The electrochemistry of phosphate at the surface of the OCPE was studied using cyclic voltammetry (CV). The voltammograms showed three reversible redox peaks corresponding to the redox of Mo(VI/V) as well as several irreversible peaks involving the formation of hydrogen molybdenum bronze. The currents of all three reversible redox peaks linearly varied versus phosphate concentrations in 0.1 mol·L −1 H 2 SO 4 -KCl. After optimizing the mass ratio of the [Omim] 6 Mo 7 O 24 and carbon powder, peak C6 shows a wide linear range (1.0 × 10 –2 –1.0 × 10 –7 mol·L −1 ; R 2 = 0.9970) with a sensitivity of 5.3 (± 0.1) μA/μM. The limit of detection (LOD = 3 σ /s) was 8.5 × 10 –8 mol·L −1 . Interferences from common anions, silicate, and glyphosate on phosphate analysis were also investigated. The proposed sensing method was successfully applied to the determination of phosphate in tap water, whose results were verified with ion chromatography (IC).
研究领域:
分析化学
·
环境科学
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产品关联
DOI
高影响因子
Heliyon
·
2023
·
IF 4
Liang Hao,Yaxin Qi,Yingchun Wu,Donghui Xia
A simple solid phase extraction (SPE) coupled with spectrophotometric method was developed for determination of trace permanganate (MnO 4 − ) in water. Commercial reagent polyamined-6 powder was used as SPE stationary phase to retain MnO 4 − which is based on the fact that MnO 4 − can be adsorbed on polyamide 6 (PA-6) sorbent as water samples flow through the SPE cartridge. 3,3′,5,5′-tetramethylbenzidine (TMB) were used both as eluent solution and chromogenic agent to convert the adsorbed MnO 4 − into Mn 2+ and generate blue oxidized product with high molar absorptivity. Quantification of MnO 4 − could be obtained by spectrophotometric detection of the resulting solution flow out of the SPE cartridge. The extraction and detection variables was optimized to maximize the absorbance of the TMB oxidized product. Under optimized conditions, this method provided linear dynamic ranges of 0.01–1 μmol L −1 for MnO 4 − with preconcentration of 100 mL water sample. The limits of detection (3S b /m) of this method in deionized water were calculated to be 5.1 nM, and the relative standard deviations were determined to be 3.2% (C = 0.1 μmol L −1 , n = 5). This method has been applied to the determination of MnO 4 − in spiked tap waters and satisfactory recovery was obtained.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Zuo-Qin Liang,Dong-Dong Song,Zhuo-Cheng Li,Su-Hang Xu,Guo-Liang Dai,Chang-Qing Ye,Xiao-Mei Wang,Xu-Tang Tao
Photoactivatable probes can switch fluorescence on from a weak or nonemission state to improve the sensitivity of the sensing system. In this work, we successfully constructed three highly emissive photoactivatable probes, 2-DP, 1-2-DP and 2-2-DP, for Cu 2+ detection. Under UV irradiation, the photoluminescence quantum yields of 2-DP, 1-2-DP and 2-2-DP display approximately 52.4-, 11.5- and 49.2-fold enhancement, respectively. Cu 2+ selectively quenches the bright photoactivated fluorescence, resulting in an approximately 38-fold fluorescence reduction. The highly selective fluorescence response to Cu 2+ yields an excellent low detection limit of 5.8 nM. Moreover, the photoactivatable probes were successfully applied for Cu 2+ determination in tap water and tea samples with recovery ranges of 95%–105% and 97%–106%, respectively. This work provides a more sensitive and efficient methodology for Cu 2+ detection in heavy metal pollution and food safety.
研究领域:
分析化学
·
环境科学
·
食品安全
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DOI
PubMed
高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2014
·Vol. 238
·期 5
·889-894
·
IF 1.387
Zhu Jinghui,Li Chunyan,Liu Shaopu,Liu Zhongfang,Yang Jidong,Tian Jing,Hu Xiaoli
A non-diazotization-coupling reaction-based colorimetric method was developed and validated for the determination of nitrite in tap water and milk samples. Under acidic condition, nitrite could selectively react with pyrrole, resulting in the emerging of a new absorption peak at 509 nm and a distinct color change from clear to red, with which the concentration of nitrite can be determined indirectly. Excellent linear range was achieved from 0.72 to 40.0 μmol L −1 with a detection limit of 0.22 μmol L −1 . The detection limit was lower than or comparable to most of the recently published methods. The experimental conditions were optimized, and effects of coexisting substances were evaluated, and the results showed excellent priority since a certain amount of other anions, including SO 3
− , SeO 3
− and other acid radicals, would not interfere with the measurement. We highlighted the simplicity and efficiency of this method as no diazotization-coupling procedure and toxic aniline were involved. Determination of nitrite in tap water and milk samples was performed.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 5
·3364-3370
·
IF 3.9
Yuying Jiang,Yifeng E,Pengyan Wei,Jia Wang,Peng Chen,Lei Wang,Thomas F. Krenzel,Kun Qian,Xiyuan Tong
An electrochemical method based on a Linde Type-A zeolite-modified glass carbon electrode (LTA/GCE) was introduced for the determination of retinoic acid (RA). LTA zeolite could be synthesized through a hydrothermal method and served as a commercial electrochemical sensor with high stability and sensitivity in electrochemical progress. The as-synthesized product was characterized by scanning electron microscopy (SEM), differential thermal analysis (DTA), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Under optimal conditions, a detection limit of 0.8 μM was obtained for RA with a linear range of 0.8–20.1 μM. This electrochemical method for determining RA was simpler and cheaper than previously reported methods. Furthermore, the modified electrode could be applied to the detection of RA in tap water, achieving a linear range of 1.4–15.0 μM with a detection limit of 1.4 μM and good recovery. The modified electrode designed by this method provided good selectivity, stability, and reproducibility for RA determination and reliable application for the analysis of RA in environmental water.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
PubMed
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
·
生物传感
·
水处理
·
分子诊断
✓ 已验证
DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Hao Shuaipeng,Zhang Yi,Liu Shuaiwei,Tan Zhouliang,Liu Wei,Xia Yuanguang,Yin Wen,Liao Yaqi,Ji Haijin,Kong Yuelin,Shao Yudi,Lv Yuelin,Qie Long,Huang Yunhui,Yuan Lixia
Direct regeneration offers a shortcut to close the material supply loop of lithium-ion batteries and is a promising recycling strategy. However, in spent LiNi 0.5 Co 0.2 Mn 0.3 O 2 positive electrode, severe bulk cation disorder and surface rock salt phase hinder Li + reinsertion. Moreover, the coexistence of single and poly-crystal particles in commercial batteries further complicates uniform re-lithiation and morphological regeneration. Herein, we propose an oxidation strategy to simultaneously regulate the structural reconstruction and morphological evolution of spent material. During oxidation, surface NiO transforms into NiOOH, while targeted oxidation of the anti-site Ni 2+ to Ni 3+ in the bulk reduces Li + /Ni 2+ mixing. This reconstructs Li + diffusion channels from surface to bulk, facilitating re-lithiation. Meanwhile, structural changes induce lattice expansion in secondary particles, causing their decomposition into primary particles and forming uniform precursor particles. These particles, with continuous Li + transport channels and NiOOH surface, agglomerate into large single-crystal during calcination. The regenerated LiNi 0.5 Co 0.2 Mn 0.3 O 2 achieves a high tap density of 2.57 g/cm 3 and retains 80.2% capacity after 600 cycles. This work presents a concept for the direct regeneration of degradable positive materials.
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DOI
PubMed
高影响因子
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
·
2019
·Vol. 29
·期 10
·105005
·
IF 2.141
Xiangyi Hu,Hui Guo,Tong Qi,Weihua Fan,Chunping Jia,Baojian Xu,Qinghui Jin,Andreas Offenhäusser,Jianlong Zhao
A compact, durable, low-reagent-usage, portable miniaturized electrochemical sensor is successfully developed for the high sensitivity detection of trace lead. We fabricated micropillars array working electrodes on the chip and established ultra-low concentration sodium acetate-acetate (NaAC-HAC) buffers (pH ≈ 4.5) system to enhance the detection sensitivity of the sensor. The ultra-low concentration buffer possesses unique features such as low baseline current and high peak current difference height. The analytical performance of the fabricated electrochemical sensor with 3D gold (Au) working electrodes modified by bismuth-film was comprehensively studied. The microsensor exhibited a high sensitivity of 0.0412 µA ppb−1 and a satisfactory detection limit of 0.15 ppb when detecting lead ions under optimized conditions. Moreover, good linearity (correlation coefficient: 0.9993) with lead ion measurements in the concentration range of 1–120 ppb and excellent repeatability (RSD: 1.79%) was obtained, the chip has satisfactory selectivity for common interference ion. Besides, a low consumption of 350 µl of reagents per test was acquired. Finally, the proposed microsensor was applied to detect trace metal ions in tap and lake samples with satisfactory results.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 13
·2723-2728
·
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
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
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
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）