JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Shengqian Zhou,Jing Lin,Xiaofei Qin,Ying Chen,Congrui Deng
An improved ion chromatographic method including two elution procedures was proposed for the quantitative determination of atmospheric alkylamines in field atmospheric samples involving high levels of inorganic cations by using 18-crown-6 as mobile phase additive. When 18-crown-6 was added to the mobile phase, the retention times increased significantly for Na + , NH 4 + , K + and primary alkylamines but decreased for secondary and tertiary alkylamines due to the complexation with certain cations and interaction with both stationary and mobile phases of 18-crown-6. As a result, the separation of the cations was greatly promoted, which reduced the interference of peak distortion of overloaded inorganic cations on the quantitation of adjacent alkylamines. By using the presented method, five inorganic cations (Na + , NH 4 + , K + , Mg 2+ , Ca 2+ ) and six alkylamines (dimethylamine (DMAH + ), trimethylamine + diethylamine (TMAH + + DEAH + ), propylamine (MPAH + ), triethylamine (TEAH + ), ethanolamine (MEOAH + ) and triethanolamine (TEOAH + )) were effectively separated and determined, and the relative standard derivations (RSDs) of objective cations were all less than 1% for retention time and 3.1% for peak area (n = 9), respectively. The linearity was excellent for each cation (R 2 > 0.993) except for NH 4 + and TEOAH + showing a non-linear response (R 2 > 0.998 for theoretical non-linear fitting), and the detection limit of these cations were 0.03–1.19 ng. The proposed method was successfully used in the determination of both alkylamines and inorganic cations in ambient particulate matters and gaseous alkylamines in ceiling duct exhaust. The annual average concentrations of DMAH + , TMAH + + DEAH + and TEAH + were 15.56, 4.35 and 16.00 ng m −3 in PM 2.5 over Shanghai in 2013. The concentrations of gaseous DMA and TMA + DEA in ceiling duct exhaust reached a maximum of 940.0 and 112.7 μg m −3 , and were positively correlated with the human activity intensity, suggesting that human excreta emissions was a potential important source of atmospheric alkylamines in urban area of Shanghai.
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
ENVIRONMENTAL POLLUTION
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2017
·
IF 5.099
Mengjie Guo,Yan Lyu,Tingting Xu,Bo Yao,Weihua Song,Mei Li,Xin Yang,Tiantao Cheng,Xiang Li
This study presents the particle size distribution and respiratory deposition estimates of airborne perfluoroalkyl acids (PFAAs) during the haze period. Size-segregated haze aerosols were collected from an urban location in Shanghai using an eight-stage air sampler. The samples were analyzed for eight PFAAs using ultra-high-performance liquid chromatography tandem triple quadrupole mass spectrometry. The quantification results showed that the concentrations of particle-bound Σ 8PFAAs ranged from 0.26 to 1.90 ng m −3 (mean: 1.44 ng m −3 ). All of the measured PFAAs particle size distributions had a bimodal mode that peaked respectively in accumulation size range (0.4 < Dp < 2.1 μm) and coarse size ranges ( Dp > 2.1 μm), but the width of each distribution somewhat varied by compound. The emission source, molecular weight , and volatility of the PFAAs were important factors influencing the size distribution of particle-bound PFAAs. Of these compounds, PFUnDA presented a strong accumulation in the fine size range (average 75% associated with particles <2.1 μm), followed by PFOA (69%) and PFDA (64%). The human risk assessment of PFOS via inhalation was addressed and followed the same pattern as the size distribution, with a 2-fold higher risk for the fine particle fraction compared to the coarse particle fraction at urban sites. Approximately 30.3–82.0% of PFAA deposition (∑PFAA: 72.5%) in the alveolar region was associated with particles <2.1 μm, although the contribution of fine particles to the total PFAAs concentration in urban air was only 28–57% (∑8PFAAs: 48%). These results suggested that fine particles are significant contributors to the deposition of PFAAs in the alveolar region of the lung.
研究领域:
环境科学
·
公共卫生
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DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Li Ma,Yuhong Li,Lei Yao,Hongmei Du
Previous studies on the distribution patterns and health risks of polycyclic aromatic hydrocarbons (PAHs) from cities were focused on soils, leaving the soil-plant system less investigated. In this study, PAHs in the soil-turfgrass system in the urban area of the megacity Shanghai were investigated. The results indicated that total PAH concentrations in soils and turfgrasses ranged from 163.02 to 14,289.30 ng g −1 and 45.15 to 1076.98 ng g −1 , respectively. On average, four- and three-ring PAHs such as fluoranthene (14.4%) and pyrene (12.4%) were dominant in soils and naphthalene (37.1%) was especially enriched in turfgrasses. The significant differences in compositional profiles of PAHs between soils and turfgrasses implied selective uptake and translocation of PAHs by turfgrasses from soils. The in situ bioconcentration factors (BCFs) of ∑ 16 PAHs in turfgrasses ranged 0.004–1.3, with ryegrass the highest. BCFs decreased significantly with increasing PAH concentrations in soils, suggesting that turfgrass-assisted PAH removal vial root uptake may be more efficient in slightly contaminated soils. Source appointment results indicated that PAHs in Shanghai were majorly derived from fossil fuel/biomass combustion, vehicular emissions and coking. The incremental lifetime cancer risk (ILCR) analysis generally showed a potential cancer risk for adults (total ILCRs > 1 × 10 −6 for all sites) and children (total ILCRs > 1 × 10 −6 for most sites) especially through dermal contact with soil. Some sites showed total ILCR values above 1 × 10 −4 , indicating high health risks for both. The results are informative for contamination prevention and control in urban soils from Shanghai and will provide guidance for further exploration of the phytoremediation potential of turfgrasses.
研究领域:
环境科学
·
生态学
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Shuning Wang,Cheng Peng,Nan Sheng,Lushi Lian,Jiayin Dai,Xiaohong Guan
Bisphenol analogues (BPs), a prominent group of endocrine-disrupting compounds, are widely used in the production of epoxy resins and polycarbonate plastics, leading to their inevitable release into aquatic environments. However, limited data exists on the occurrence of BPs in drinking water sources and upstream rivers. In this study, we developed and validated a solid-phase extraction method coupled with ultra-performance liquid chromatography-tandem mass spectrometry for the trace-level detection and simultaneous quantification of 19 BPs in surface water. Seventeen BPs were detected in the Taipu River with concentrations ranging from non-detectable to 38.2 ng L –1 and industrial discharges may be a primary source of BPs contamination. For the first time, the presence of bisphenol C-dichloride (BPC-di) and tetrachlorobisphenol A in surface water was reported, with mean concentrations of 11.5 ng L –1 and 2.0 ng L –1 , respectively. In drinking source water, 15 BPs were found, with bisphenol A, bisphenol B, and BPC-di being the most abundant ones. Additionally, a comprehensive toxicity assessment was performed to evaluate the ecological risks associated with these BPs. Although risk quotient values indicated negligible ecological risk for these BPs, estrogen equivalence values suggested potential estrogenic risks in the river. This study provides new insights into the occurrence, ecological risks, and estrogenic effects of BPs in source water and its upstream river systems.
研究领域:
环境科学
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毒理学
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分析化学
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产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2023
·
IF 6
Yinghua Nie,Lijia Chen,Ye Zi,Jiahui Chen,Jiamin Xu,Wenzheng Shi,Xichang Wang,Jian Zhong
Frozen tilapia muscle-based Shanghai smoked fish without fish bones was developed using a three-stage method (salt pickling, frying, and sugar smoking), and the effect of varying salt amounts (0.5%, 1.0%, and 1.5% of muscles) was studied. The muscle with 1.0% salt had the best sensory evaluation score. Salt pickling significantly increased and then frying significantly decreased the numbers and concentrations of the volatile organic compounds (VOCs) in the muscles. Compared with the others, 1.0% salt resulted in the lowest numbers and concentrations of the VOCs in the frying stage and the highest VOC concentrations in the sugar smoking stage. Statistical analyses of VOC concentrations suggested that two VOC classes (esters and aldehydes) and 42 VOC individuals could be used to differentiate the treated tilapia muscles with different salt amounts. This work provided a basic knowledge of the effects of food processing stages and salt amounts on fish quality.
研究领域:
食品科学
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水产加工学
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产品关联
DOI
高影响因子
Nuclear Science and Techniques
·
2023
·Vol. 34
·期 12
·1-10
·
IF 2.8
Li Zhen-Jiang,Qi Cheng-Hang,Li Bei-Ning,Yang Shu-Min,Zhao Jun,Lei Zhi-Di,Zhu Shi-Jie,Shi Hao,Wang Lu,Wu Yan-Qing,Tai Ren-Zhong
Evaluating the comprehensive characteristics of extreme ultraviolet (EUV) photoresists is crucial for their application in EUV lithography, a key process in modern technology. This paper highlights the capabilities of the Shanghai Synchrotron Radiation Facility (SSRF) 08U1B beamline in advancing this field. Specifically, it demonstrates how this beamline can create fringe patterns with a 15-nm half-pitch on a resist using synchrotron-based EUV lithography. This achievement is vital for evaluating EUV photoresists at the advanced 5-nm node. We provide a detailed introduction to the methods and experimental setup used at the SSRF 08U1B beamline to assess an EUV photoresist. A significant part of this research involved the fabrication of high-resolution hydrogen silsesquioxane mask gratings. These gratings, with an aspect ratio of approximately 3, were created using electron beam lithography on an innovative mask framework. This framework was crucial in eliminating the impact of zeroth-order light on interference patterns. The proposed framework propose offers a new approach to mask fabrication, particularly beneficial for achromatic Talbot lithography and multicoherent-beam interference applications.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Environmental Science-Processes & Impacts
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2019
·Vol. 21
·期 7
·1184-1192
·
IF 2.688
Yaqin Gao,Yan Lyu,Xiang Li
The present study was conducted to examine the potential mechanisms responsible for the distribution of polycyclic aromatic hydrocarbons (PAHs) and their oxygenated derivatives (o-PAHs) in size fractionated particles and their environmental implications. Size-fractionated atmospheric particles were collected at urban Shanghai, China and analyzed for 5 PAHs and 6 o-PAHs. The concentrations of particle-bound ∑6o-PAHs (sum of 6 o-PAH congeners, 19.1 ± 4.5 ng m−3) were significantly higher than those of ∑5PAHs (sum of 5 PAHs, 9.5 ± 1.9 ng m−3). The size-fractionated distributions of airborne ∑5PAHs and ∑6o-PAHs displayed bimodal peaks at 0.7–1.1 and 9.0–10.0 μm. Emission sources and volatility were important factors influencing the size distribution of particle-bound 5 PAHs and 6 o-PAHs. The dry deposition fluxes of particle-bound 6 o-PAHs estimated from the measured data (3087 ± 467 ng m−2 d−1) were approximately 2 times higher than those of PAHs (1531 ± 344 ng m−2 d−1), with a total deposition flux of 4618 ± 743 ng m−2 d−1. The relative contributions of particles to dry deposition were also size-dependent, e.g., coarse (aerodynamic diameters (Dp) > 2.1 μm) particles dominated the dry deposition fluxes of PAHs and o-PAHs. These results highlight the significance of providing a comprehensive understanding of particle size distribution of PAHs and o-PAHs and their implication for dry deposition in China.
研究领域:
环境科学
·
大气化学
·
污染研究
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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）