CHEMOSPHERE
·
2022
·
IF 8.943
Wei Liu,Tao Lin,Xue Zhang,Fuchun Jiang,Xiaoshu Yan,Han Chen
The safety threat posed by Perfluoroalkyl acids (PFAAs) in drinking water is a growing concern. In this study, we loaded chitosan (CS) on granular activated carbon (GAC) to adsorb PFAAs, and we explored the role of nanobubbles in the adsorption process through experiments and density functional theory (DFT) calculations. Compared with GAC, we found that the use of the composite adsorbent (CS/GAC) enhanced the removal rate of perfluorooctanoic acid by 136% with the assistance of nanobubbles. PFAAs with different chain lengths have different adsorption mechanisms owing to surface activity differences. PFAAs with longer C–F chains can be directly enriched with amino groups on the CS or air–water interface on composite adsorbents. Additionally, PFAAs can be enriched with nanobubbles in solution to form nanobubble–PFAA colloids, which are adsorbed by protonated amino groups on CS through electrostatic interactions. We found that PFAAs with shorter C–F chains are less affected by nanobubbles, and DFT calculations indicated that the adsorption of short-chain PFAAs is mainly affected by electrostatic interactions. We also proved that the electrostatic interactions between CS and PFAAs are mainly derived from the abundant protonated amino groups.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Bo Yang,Yanni Han,Gang Yu,Qiongfang Zhuo,Shubo Deng,Jinhua Wu,Peixin Zhang
Electrocoagulation (EC) technique was used to investigate the removal performance of aqueous perfluoroalkyl acids (PFAAs) with relatively high concentration as simulating the wastewater from organic fluorine industry. A comparison between iron and aluminum electrode was made to remove PFAAs with the similar electrolysis condition. Effective removal of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) was obtained by EC process, especially for Fe anode. Several key factors were studied to optimize the EC process using Fe electrode. At the optimal operating parameters including 25.0 mA/cm 2 of current density, 180 rpm of stirring speed, and 2 g/L NaCl as supporting electrolyte, more than 99% of PFOS could be removed with 0.25 mM of initial concentration after 50-min electrolysis. Additionally, the adsorptive removal of aqueous PFOS on iron hydroxide flocs during EC was also verified by Fourier transform infrared spectra. The investigation of removal efficiency for PFAAs with different carbon chain length after EC and the characteristic of zeta potential on Fe flocs indicated that the electrostatic adsorption was primarily responsible for the PFAAs sorption on the iron hydroxide flocs.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
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
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2017
·Vol. 14
·期 9
·970
·
IF 2.101
Gehui Wang,Jianjiang Lu,Zhenni Xing,Shanman Li,Zilong Liu,Yanbin Tong
Despite risks associated with perfluoroalkyl acids (PFAAs) in many regions, little is known about their prevalence in Xinjiang. We determined the presence of 13 PFAAs in 293 beef muscle and liver samples collected in 22 cities covering northern, southern, and eastern Xinjiang using liquid chromatography, coupled with tandem mass spectrometry. Overall, the average values for PFAAs were relatively low compared with previous studies. Liver presented higher mean levels of total PFAAs at 1.632 ng/g, which was over 60-fold higher than in muscle (0.026 ng/g). Among the PFAAs analyzed, medium-chain compounds were dominant, accounting for more than 70% of the total. Perfluorooctane sulfonate (PFOS) was highly prevalent in the liver with the highest mean concentration (0.617 ng/g) and detection frequency (80%). When comparing the three regions of Xinjiang, we found differences in PFAA profiles, with the northern region showing the highest levels. Furthermore, the average daily intake and hazard ratios of PFOS and perfluorooctanoic acid varied by region, urban/rural environment, gender, ethnicity, and age. The highest risk value of 13 PFAAs was estimated to be 0.837 × 10−3, which is far below 1, indicating that there is no health risk posed by eating beef muscle and liver in Xinjiang.Keywords:perfluoroalkyl acids;muscle;liver;average daily intake;health risk;Xinjiang
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Meng-Meng Pan,Qinying Li,Li Xu
Perfluoroalkyl acids (PFAAs) are persistent organic pollutants and it should be removed from the environment before they reach public for water consumption. Herein, the quaternized hierarchically porous polystyrene-divinylbenzene (PS-DVB-N + ) was designed as the adsorbent to remove PFAAs. PS-DVB-N + provided multiple interactions with PFAAs, i.e. hydrophobic, electrostatic and hydrogen interactions, beneficial to enhance the adsorption capacity. Additionally, the multiple interactions could compensate for each other so that relatively stable adsorption performance was expected under different adsorption conditions. Moreover, thanks to hierarchically porous structure of the adsorbent, blockage of adsorbent’s pores by aggregates which were formed at certain PFAAs’ concentrations was inhibited or at least lessened, thus promoting mass transfer and enhancing adsorption efficiency. For the individual four studied PFAAs, adsorption kinetics all well fitted pseudo-second-order model, reaching adsorption equilibrium quickly within 200 min. Particularly, the four studied PFAAs were competitively adsorbed. Perfluorooctane sulfonic acid and perfluorodecanoic acid were fast adsorbed at the beginning until completely adsorbed; adsorption of perfluorooctanoic acid and perfluoroheptanoic acid then took place if the enough adsorbent was available. Besides, PS-DVB-N + was conveniently regenerated for repetitive usages. This study proposed an efficient adsorbent towards PFAAs with large adsorption capacity, fast adsorption rate and good resistance to the adsorption condition, which was potential for real applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xiaoyu Liu,Xianli Wang,Shuang Hong,Huatian Zhou,Xiaolong Cao,Kepiao Li,Qicai Zhang,Chunxia Yao,Wanchao Chen,Wen Li,Weiguo Song,Qinxiong Rao
Per-and polyfluoroalkyl substances (PFASs) have garnered significant attention owing to their prevalence and adverse effects on humans. The direct dietary intake of perfluoroalkyl acids (PFAAs) and PFAAs precursors (pre-PFAAs) biotransformation are considered major contributors to human exposure to PFASs. However, little information is available on analytical methods for the simultaneous detection of PFAAs and pre-PFAAs. In the present study, a single-step sample-treatment-based supramolecular solvents-dispersed liquid-liquid microextraction (SUPRASs-DLLME) technique was established for the analysis of 16 PFAAs and 7 pre-PFAAs in aquatic food. SUPRASs were synthesized using 1-heptanol (3 mL) and tetrahydrofuran (4 mL), which were self-assembled in water. The parameters for microextraction, such as extraction method and enrichment capacity, were optimized. Under the optimum conditions, the limit of detection (LOD) and limit of quantification (LOQ) were 0.03–0.15 ng·g −1 and 0.1–0.5 ng·g −1 , respectively. Good linearities (R 2 > 0.996) were obtained for all the target compounds, and the recoveries ranged 81.1–120 % with relative standard deviations (RSDs) lower than 20 %. This method was applied to the analysis of 16 PFAAs and 7 pre-PFAAs in aquatic food samples (crabs, prawns, and fish). This study provides a new idea for analyzing other pollutants in biological samples.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 25
·25486-25495
·
IF 2.8
Wang Gehui,Lu Jianjiang,Li Shanman,Liu Zilong,Chang Haisha,Xie Chunbin
The presence of perfluoroalkyl acids (PFAAs) in animal foods is worldwide, and their fate and spatial distribution in Xinjiang are not well understood. In this study, beef muscle and liver collected from five major cities in southern Xinjiang were analyzed ( n = 70) for 13 PFAAs using an ion-pairing method combined with HPLC-MS/MS. Overall, PFAA contamination was widespread, exceeding 50% of samples with concentrations ranged from below the limits of detection to 6.118 ng/g. Perfluorooctane sulfonate, perfluorooctanoic acid, and perfluoroundecanoic acid were the predominant PFAAs of ten detected compounds, with maximum concentrations in Korla liver samples of 2.543, 0.856, and 1.386 ng/g, respectively. When comparing the five cities, the highest levels and detection frequencies were observed in samples from Korla (muscle, 0.013 ng/g; liver, 3.336 ng/g), followed by Yanqi, Akesu, Kashgar, and Hotan. The different pollution patterns and distribution profiles of PFAAs among cities were significantly related to local economy and geographical conditions. In addition, the dietary intake assessments for PFAAs showed that samples originating from Korla had the greatest impact on human health, but the total hazard ratio was 0.814 × 10 −3 , which is far less than 1, indicating that consumption of beef muscle and liver poses no immediate harm to local residents.
研究领域:
环境科学
·
食品科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xinying Gong,Linyan Xu,Xiaoxue Kou,Juan Zheng,Yixin Kuang,Suxin Zhou,Siming Huang,Yu Zheng,Wei Ke,Gousheng Chen,Gangfeng Ouyang
The ubiquitous occurrence of perfluoroalkyl acids (PFAAs) in environmental water has drawn much attention due to their high persistence and bioavailability. However, it is difficult for the traditional adsorbents to extract PFAAs because of their unique hydrophobic and oleophobic properties. In this study, an amino-functionalized ZIF-8 (NH 2 -ZIF-8) was fabricated and used as the coating materials of the solid-phase microextraction fiber for the determination of PFAAs in water samples. The introduction of the amino group improved the extraction performance of PFAAs via electrostatic interaction and hydrogen bond, which exhibited better extraction efficiencies than those of ZIF-8 coated fiber and commercial fibers. The extraction efficiencies of PFAAs decreased with the increase of pH values, indicating that electrostatic interaction between the carboxylic acid group of PFAAs and the amino group of NH 2 -ZIF-8 played a dominating role in enrichment. The fabricated fiber coupled with high-performance liquid chromatography-triple quadrupole mass spectrometry (HPLC-MS/MS) was used for the detection of PFAAs in water samples, with a wide linear range (1–5000 ng L −1 ), low limits of detection (0.15–0.75 ng L −1 ), and good repeatability and reproducibility (1.9%-15.5%). The established method has been successfully applied in environmental water analysis, which provides a practical method for the determination of PFAAs in a convenient manner.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Haiyang Zhang,Junjie Ou,Yinmao Wei,Hongwei Wang,Zhongshan Liu,Hanfa Zou
A hybrid fluorous monolithic column was simply prepared via photo-initiated free radical polymerization of an acrylopropyl polyhedral oligomeric silsesquioxane (acryl-POSS) and a perfluorous monomer (2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl acrylate) in UV-transparent fused-silica capillaries within 5 min. The physical characterization of hybrid fluorous monolith, including scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, mercury intrusion porosimetry (MIP) and nitrogen adsorption/desorption measurement was performed. Chromatographic performance was also evaluated by capillary liquid chromatography (cLC). Due to the fluorous–fluorous interaction between fluorous monolith and analytes, fluorobenzenes could well be separated, and the column efficiencies reached 86,600–92,500 plates/m at the velocity of 0.87 mm/s for alkylbenzenes and 51,900–76,000 plates/m at the velocity of 1.10 mm/s for fluorobenzenes. Meanwhile, an approach to integrate nanoelectrospray ionization (ESI) emitter with hybrid fluorous monolithic column was developed for quantitative determination of perfluoroalkyl acids by nanoHPLC–ESI-MS/MS. The integration design could minimize extracolumn volume, thus excluding undesirable peak broadening and improving separation performance.
研究领域:
分析化学
·
环境科学
·
质谱分析
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yanke Lu,Hongyuan Yan,Pengfei Li,Yehong Han,Shigang Shen
Perfluoroalkyl acids (PFAAs) are emerging pollutants that endangers food safety. Developing methods for the selective determination of trace PFAAs in complex samples remains challenging. Herein, an ionic liquid modified porous imprinted phenolic resin-dispersive filter extraction-liquid chromatography-tandem mass spectrometry (IL-PIPR−DFE−LC-MS/MS) method was developed for the determination of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in eggs. The new IL-PIPR adsorbent was prepared at room temperature , which avoids the disorder and instability of the template at high temperatures. The imprinting factor of IL-PIPR for PFOA and PFOS exceeded 7.3. DFE, combined with IL-PIPR (15 mg), was used to extract PFOA and PFOS from eggs within 15 min. The established method exhibits low limits of detection (0.01–0.02 ng/g) and high recoveries (84.7%–104.7%), which surpass those of previously reported methods. This work offers a new approach to explore advanced imprinted adsorbents for PFAAs, efficient sample pretreatment technique, and analytical method for pollutants in foods.
研究领域:
环境科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMEDICAL CHROMATOGRAPHY
·
2018
·Vol. 32
·期 7
·e4223
·
IF 1.688
Zhixiong Zhong,Gongke Li,Lingchuan Guo,Jing Yao,Zhe Liu,Jianchao Deng
A highly sensitive method was developed for the analysis of short-chain perfluorinated alkyl acids (PFAAs) in serum samples using solid-phase extraction (SPE) coupled with ion chromatography–electrospray ionization–mass spectrometry. The synthesized amino-functionalized graphene oxide nanocomposites were used as an SPE sorbent for the enrichment of trace analytes and purification of samples. They exhibited high selectivity to polar compounds. The suppressor was employed to remove counterions and reduce background signals of mobile phase. These two crucial steps could effectively eliminate matrix effects and enhance analytical sensitivity. The lowest limits of quantification were 2.0 μg L −1 for perfluorobutanoic acid and perfluorovaleric acid, 1.0 μg L −1 for perfluorocaproic acid and 0.50 μg L −1 for perfluorobutane sulfonic acid, respectively. The procedure was successfully applied for determination of trace PFAAs in 25 serum samples. Mean recoveries ranged from 86.3 to 101.4% with relative standard deviations of 1.6–6.8%. The method allowed an excellent separation and quantification of short-chain PFAAs that were difficult to analyze by conventional chromatography.
研究领域:
分析化学
·
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 48
·期 1
·24
·
IF 3.8
Wang Bin,Yao Yiming,Sun Hongwen,Zhao Hongyan,Yu Qingxia
Wastewater treatment plants (WWTPs) and landfill represent critical point sources for per- and polyfluoroalkyl substance (PFAS) emission to the atmosphere. This study aimed to (1) quantitatively characterize both neutral and ionizable PFAS in air samples from these sources, and (2) estimate the potential emission contributions of unknown PFAS precursors. Using an optimized cartridge-based active air sampler, we collected atmospheric samples from a WWTP and landfill in Tianjin, China. Quantitative analysis revealed comparable concentration ranges for neutral (Σn-PFAS: 2,816–564,343 pg/m 3 ) were higher than ionizable PFAS (Σi-PFAS: 4,275–13,360 pg/m 3 ), with 8:2 fluorotelomer alcohol (8:2 FTOH; 2,273–13,360 pg/m 3 ) dominating neutral species and trifluoroacetic acid (TFA; 2,490–10,575 pg/m 3 ) prevailing among ionizable compounds. The total oxidizable precursor assay demonstrated that unknown precursors accounted 46.4–58.4 mol% of total PFAS. These findings provide the quantitative evidence of airborne PFAS speciation and associated unknown precursor-derived emission contributions in the WWTP and landfill.
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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）