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1. Novel chitosan–ethylene glycol hydrogel for the removal of aqueous perfluorooctanoic acid

Author:
Long, Li; Hu, Xiaolan; Yan, Jinpeng; Zeng, Yifan; Zhang, Jiaqi; Xue, Yingwen
Source:
Journal of environmental sciences (China) 2019 v.84 pp. 21-28
ISSN:
1001-0742
Subject:
perfluorooctanoic acid,   etc   ; adsorbents; adsorption; anions; chitosan; ethylene glycol; freeze-thaw cycles; hydrogels; hydrogen bonding; models; moieties;     Show all 11 Subjects
Abstract:
... It is urgent to explore an effective removal method for perfluorooctanoic acid (PFOA) due to its recalcitrant nature. In this study, a novel chitosan-based hydrogel (CEGH) was prepared with a simple method using chitosan and ethylene glycol through a repeated freezing–thawing procedure. The adsorption of PFOA anions to CEGH agreed well to the Freundlich–Langmuir model with a maximum adsorption cap ...
DOI:
10.1016/j.jes.2019.04.007

2. Photocatalytic defluorination of perfluorooctanoic acid by surface defective BiOCl: Fast microwave solvothermal synthesis and photocatalytic mechanisms

Author:
Sun, Yuanyuan; Li, Guiying; Wang, Wanjun; Gu, Wenquan; Wong, Po Keung; An, Taicheng
Source:
Journal of environmental sciences (China) 2019 v.84 pp. 69-79
ISSN:
1001-0742
Subject:
perfluorooctanoic acid,   etc   ; energy; hydroxyl radicals; irradiation; lighting; microwave treatment; oxidation; oxygen; photocatalysis; photocatalysts; risk; solar radiation;     Show all 12 Subjects
Abstract:
... There is an urgent need for developing cost-effective methods for the treatment of perfluorooctanoic acid (PFOA) due to its global emergence and potential risks. In this study, taking surface-defective BiOCl as an example, a strategy of surface oxygen vacancy modulation was used to promote the photocatalytic defluorination efficiency of PFOA under simulated sunlight irradiation. The defective BiOC ...
DOI:
10.1016/j.jes.2019.04.012

3. Assessing exposure to legacy and emerging per- and polyfluoroalkyl substances via hair – The first nationwide survey in India

Author:
Ruan, Yuefei; Lalwani, Dipa; Kwok, Karen Y.; Yamazaki, Eriko; Taniyasu, Sachi; Kumar, Nirmal J.I.; Lam, Paul K.S.; Yamashita, Nobuyoshi
Source:
Chemosphere 2019 v.229 pp. 366-373
ISSN:
0045-6535
Subject:
perfluorooctanoic acid,   etc   ; cities; environmental monitoring; females; hairs; national surveys; perfluorohexane sulfonic acid; perfluorooctane sulfonic acid; India;     Show all 9 Subjects
Abstract:
... In recent years, environmental issues emerging from per- and polyfluoroalkyl substances (PFAS) have raised high concern worldwide. Levels of human exposure to PFAS remain unknown in India. Biomonitoring data obtained from hair analysis have been evidenced to provide insight into retrospective human exposure to PFAS. In this study, 25 PFAS, including perfluoroalkyl acids and their precursors, were ...
DOI:
10.1016/j.chemosphere.2019.04.195

4. Field-scale evaluation of the uptake of Perfluoroalkyl substances from soil by rice in paddy fields in South Korea

Author:
Kim, Hyerin; Ekpe, Okon Dominic; Lee, Jong-Hyeon; Kim, Dong-Hoon; Oh, Jeong-Eun
Source:
The Science of the total environment 2019 v.671 pp. 714-721
ISSN:
0048-9697
Subject:
perfluorooctanoic acid,   etc   ; brown rice; carboxylic acids; paddies; paddy soils; perfluorononanoic acid; South Korea;     Show all 7 Subjects
Abstract:
... The concentrations of 17 perfluoroalkyl substances (PFASs) were investigated in paddy soil, void water, and brown rice collected from 30 paddy fields to examine the uptake of PFASs from soil by rice. The total concentrations of PFASs ranged from 7.76 to 3020 ng/L (average = 166 ng/L) in void water, 0.120 to 13.9 ng/g dry-weight (dw) (1.92 ng/g dw) in paddy soils, and from not-detected to 1.85 ng/g ...
DOI:
10.1016/j.scitotenv.2019.03.240

5. Relationship between perfluorooctanoate and perfluorooctane sulfonate blood concentrations in the general population and routine drinking water exposure

Author:
Zhang, Shiyi; Kang, Qiyue; Peng, Hui; Ding, Mengyu; Zhao, Fanrong; Zhou, Yuyin; Dong, Zhaomin; Zhang, Haifeng; Yang, Min; Tao, Shu; Hu, Jianying
Source:
Environment international 2019 v.126 pp. 54-60
ISSN:
0160-4120
Subject:
perfluorooctanoic acid,   etc   ; blood; blood sampling; cities; drinking water; geometry; humans; models; perfluorooctane sulfonic acid; China;     Show all 10 Subjects
Abstract:
... In regions with heavily contaminated drinking water, a significant contribution of drinking water to overall human perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) exposure has been well documented. However, the relationship of PFOA/PFOS blood concentrations in the general population to routine drinking water exposure is not well characterized. This study determined the PFOA and PFOS ...
DOI:
10.1016/j.envint.2019.02.009

6. Bubble-Nucleation-Based Method for the Selective and Sensitive Electrochemical Detection of Surfactants

Author:
Ranaweera, Ruchiranga; Ghafari, Carina; Luo, Long
Source:
Analytical chemistry 2019 v.91 no.12 pp. 7744-7748
ISSN:
1520-6882
Subject:
perfluorooctanoic acid,   etc   ; chemical species; detection limit; drinking water; electrochemistry; perfluorooctane sulfonic acid; pollution; surfactants; theoretical models;     Show all 9 Subjects
Abstract:
... We present the first bubble-nucleation-based electrochemical method for the selective and sensitive detection of surfactants. Our method takes advantage of the high surface activity of surfactant analyte to affect the electrochemical bubble nucleation and then transduces the change in nucleation condition to electrochemical signal for determining the surfactant concentration. Using this method, we ...
DOI:
10.1021/acs.analchem.9b01060

7. Occurrence and Degradation Potential of Fluoroalkylsilane Substances as Precursors of Perfluoroalkyl Carboxylic Acids

Author:
Zhu, Bao; Jiang, Wei; Wang, Wenxing; Lin, Yongfeng; Ruan, Ting; Jiang, Guibin
Source:
Environmental science & technology 2019 v.53 no.9 pp. 4823-4831
ISSN:
1520-5851
Subject:
perfluorooctanoic acid,   etc   ; bioactive properties; carboxylic acids; coatings; hydrophobicity; isotopes; liquids; mass spectrometry; perfluorocarbons; solvents;     Show all 10 Subjects
Abstract:
... Polyfluoroalkylsilanes (PFASis) are a class of artificial chemicals with wide applications in surface coating, which arouse attention due to their hydrophobic/oleophobic properties and potential biological effects. In this study, a robust high-resolution mass spectrometry method through direct injection into a Fourier transform ion cyclotron resonance instrument was established, with the aid of CF ...
DOI:
10.1021/acs.est.9b00690

8. Global transport of perfluoroalkyl acids via sea spray aerosol

Author:
Johansson, J. H.; Salter, M. E.; Acosta Navarro, J. C.; Leck, C.; Nilsson, E. D.; Cousins, I. T.
Source:
Environmental science 2019 v.21 no.4 pp. 635-649
ISSN:
2050-7895
Subject:
perfluorooctanoic acid,   etc   ; aerodynamics; aerosols; constitutional isomers; emissions; oceans; perfluorooctane sulfonic acid; persistent organic pollutants; sodium;     Show all 9 Subjects
Abstract:
... Perfluoroalkyl acids (PFAAs) are persistent organic pollutants found throughout the world's oceans. Previous research suggests that long-range atmospheric transport of these substances may be substantial. However, it remains unclear what the main sources of PFAAs to the atmosphere are. We have used a laboratory sea spray chamber to study water-to-air transfer of 11 PFAAs via sea spray aerosol (SSA ...
DOI:
10.1039/c8em00525g

9. Removal of perfluorooctanoic acid from water using calcined hydrotalcite – A mechanistic study

Author:
Chang, Po-Hsiang; Jiang, Wei-Teh; Li, Zhaohui
Source:
Journal of hazardous materials 2019 v.368 pp. 487-495
ISSN:
0304-3894
Subject:
perfluorooctanoic acid,   etc   ; X-ray diffraction; adsorption; anion exchange capacity; hydrotalcite; pH; surface area; thermogravimetry;     Show all 8 Subjects
Abstract:
... Calcined hydrotalcite (CHT) was evaluated for its potential removal of perfluorooctanoic acid (PFOA) from water in this study. The uptake of PFOA by CHT could be as high as 1587 mg/g (ca. 3.8 mmol/g), slightly larger than the anion exchange capacity (AEC) of the hydrotalcite (HT). Such a high removal was fast and pH independent, suggesting the versatile use of CHT. Due to the structural memory eff ...
DOI:
10.1016/j.jhazmat.2019.01.084

10. Early Events in the Reductive Dehalogenation of Linear Perfluoroalkyl Substances

Author:
Van Hoomissen, Daniel J.; Vyas, Shubham
Source:
Environmental science & technology letters 2019 v.6 no.6 pp. 365-371
ISSN:
2328-8930
Subject:
perfluorooctanoic acid,   etc   ; Gibbs free energy; dehalogenation; electrons; perfluorocarbons; perfluorooctane sulfonic acid; prediction;     Show all 7 Subjects
Abstract:
... This work details the early events in the reductive defluorination of perfluoroalkyl substances (PFASs) and presents a straightforward methodology for predicting the reduction behavior of the perfluoroalkyl acids (PFAAs) using electronic structure calculations. Electron attachment to linear perfluorocarboxylic acids generally occurs at the α-carbon and is energetically not correlated to chain leng ...
DOI:
10.1021/acs.estlett.9b00116

11. The PFOA substitute GenX detected in the environment near a fluoropolymer manufacturing plant in the Netherlands

Author:
Brandsma, S.H.; Koekkoek, J.C.; van Velzen, M.J.M.; de Boer, J.
Source:
Chemosphere 2019 v.220 pp. 493-500
ISSN:
0045-6535
Subject:
perfluorooctanoic acid,   etc   ; drinking water; factories; gardens; grasses; groundwater; leaves; manufacturing; surface water; Netherlands;     Show all 10 Subjects
Abstract:
... The ban on perfluorooctanoic acid (PFOA) has led to the production and use of alternative fluorinated compounds such as GenX. Limited information is available on the occurrence of this PFOA substitute. In this pilot study, we investigated the presence of GenX in/on grass and leaf samples collected near a fluoropolymer manufacturing plant in the Netherlands and in drinking water produced from surfa ...
DOI:
10.1016/j.chemosphere.2018.12.135

12. Core-shell quantum dots coated with molecularly imprinted polymer for selective photoluminescence sensing of perfluorooctanoic acid

Author:
Zheng, Li; Zheng, Yonghong; Liu, Yang; Long, Sha; Du, Lingling; Liang, Jiaman; Huang, Chengzhi; Swihart, Mark T.; Tan, Kejun
Source:
Talanta 2019 v.194 pp. 1-6
ISSN:
0039-9140
Subject:
perfluorooctanoic acid,   etc   ; ammonia; binding sites; ions; molecular imprinting; photoluminescence; polymers; quantum dots; silica; water supply;     Show all 10 Subjects
Abstract:
... A photoluminescence (PL) sensor based on core-shell quantum dots (QDs) coated with molecularly-imprinted polymer (MIP) shell was designed for the determination of perfluorooctanoic acid (PFOA) in water. PFOA is a persistent and bioaccumulating water contaminant whose detection is of great importance for ensuring safe water supplies. We demonstrate a simple method to fabricate CdTe@CdS QDs and then ...
DOI:
10.1016/j.talanta.2018.09.106

13. Determining global background soil PFAS loads and the fluorotelomer-based polymer degradation rates that can account for these loads

Author:
Washington, John W.; Rankin, Keegan; Libelo, E. Laurence; Lynch, David G.; Cyterski, Mike
Source:
The Science of the total environment 2019 v.651 pp. 2444-2449
ISSN:
0048-9697
Subject:
perfluorooctanoic acid,   etc   ; emissions; half life; industry; models; perfluorocarbons; polymers; soil; toxicity;     Show all 9 Subjects
Abstract:
... In recent years, fluorotelomer-based polymers (FTPs) have been the dominant product of the fluorotelomer industry. For the last decade, whether FTPs degrade to toxic perfluorocarboxylates (PFCAs) has been vigorously contested, with early studies arguing that FTPs have half-lives >1000 years, and others concluding decadal half-lives. Given this FTP half-life discrepancy of 10- to >100-fold, here we ...
DOI:
10.1016/j.scitotenv.2018.10.071

14. Reaction of Perfluorooctanoic Acid with Criegee Intermediates and Implications for the Atmospheric Fate of Perfluorocarboxylic Acids

Author:
Taatjes, Craig A.; Khan, M. Anwar H.; Eskola, Arkke J.; Percival, Carl J.; Osborn, David L.; Wallington, Timothy J.; Shallcross, Dudley E.
Source:
Environmental science & technology 2018 v.53 no.3 pp. 1245-1251
ISSN:
1520-5851
Subject:
perfluorooctanoic acid,   etc   ; anhydrides; carboxylic acids; gases; hydrolysis; wet deposition;     Show all 6 Subjects
Abstract:
... The reaction of perfluorooctanoic acid with the smallest carbonyl oxide Criegee intermediate, CH₂OO, has been measured and is very rapid, with a rate coefficient of (4.9 ± 0.8) × 10–¹⁰ cm³ s–¹, similar to that for reactions of Criegee intermediates with other organic acids. Evidence is shown for the formation of hydroperoxymethyl perfluorooctanoate as a product. With such a large rate coefficient, ...
DOI:
10.1021/acs.est.8b05073

15. Spatial and vertical variations of perfluoroalkyl acids (PFAAs) in the Bohai and Yellow Seas: Bridging the gap between riverine sources and marine sinks

Author:
Zhou, Yunqiao; Wang, Tieyu; Li, Qifeng; Wang, Pei; Li, Lei; Chen, Shuqin; Zhang, Yueqing; Khan, Kifayatullah; Meng, Jing
Source:
Environmental pollution 2018 v.238 pp. 111-120
ISSN:
0269-7491
Subject:
perfluorooctanoic acid,   etc   ; control methods; mass transfer; rivers; seawater;     Show all 5 Subjects
Abstract:
... Perfluoroalkyl acids (PFAAs) are being increasingly reported as emerging contaminants in riverine and marine settings. This study investigated the contamination level and spatial distribution of 17 PFAAs within the depth profile of the Bohai and Yellow Seas using newly detected sampling data from 49 sites (June 29 to July 14, 2016). Moreover, the riverine flux of 11 selected PFAAs in 33 rivers dra ...
DOI:
10.1016/j.envpol.2018.03.027

16. Fate of perfluorooctanoic acid (PFOA) in sewage sludge during microwave-assisted persulfate oxidation treatment

Author:
Hamid, Hanna; Li, LorettaY.
Source:
Environmental science and pollution research international 2018 v.25 no.10 pp. 10126-10134
ISSN:
0944-1344
Subject:
perfluorooctanoic acid,   etc   ; microwave radiation; microwave treatment; oxidation; sewage sludge; temperature;     Show all 6 Subjects
Abstract:
... The fate of perfluorooctanoic acid (PFOA) has been investigated for an emerging sludge treatment technique using microwave heating-assisted persulfate (PS) oxidation. The effect of heating temperature (20, 50, and 70 °C) and PS dose (PS1: 0.01; PS2: 0.1; PS3: 0.2 g/g wet sludge) was studied in sludge spiked with PFOA at an environmentally relevant concentration (200 ng/g wet weight). Control degra ...
DOI:
10.1007/s11356-018-1576-3

17. Occurrence and distribution of perfluoroalkyl substances (PFASs) in sediments of the Dalian Bay, China

Author:
Ding, Guanghui; Xue, Huanhuan; Zhang, Jing; Cui, Fuxu; He, Xin
Source:
Marine pollution bulletin 2018 v.127 pp. 285-288
ISSN:
0025-326X
Subject:
perfluorooctanoic acid,   etc   ; aquatic environment; monitoring; sediments; water pollution; China;     Show all 6 Subjects
Abstract:
... In the present study, the spatial distributions and vertical variations of PFASs in the sediments of the Dalian Bay were investigated. The total concentrations of PFASs (∑PFASs) in surface sediments of Dalian Bay ranged from 1.49 to 2.66ngg−1 dw. The predominant PFASs in surface sediments were PFOA, PFBS and PFBA with the concentration ranges of 0.50 to 0.95, 0.21 to 0.94, and 0.035 to 0.32ngg−1 d ...
DOI:
10.1016/j.marpolbul.2017.12.020

18. Concentration, distribution and sources of perfluoroalkyl substances and organochlorine pesticides in surface sediments of the northern Bering Sea, Chukchi Sea and adjacent Arctic Ocean

Author:
Kahkashan, Sanober; Wang, Xinhong; Chen, Jianfang; Bai, Youcheng; Ya, Miaolei; Wu, Yuling; Cai, Yizhi; Wang, Siquan; Saleem, Monawwar; Aftab, Javed; Inam, Asif
Source:
Chemosphere 2019 v.235 pp. 959-968
ISSN:
0045-6535
Subject:
perfluorooctanoic acid,   etc   ; DDT (pesticide); HCH (pesticide); isomers; marine sediments; metabolites; perfluorocarbons; rivers; runoff; Arctic region; Bering Sea; Chukchi Sea;     Show all 12 Subjects
Abstract:
... Perfluoroalkyl substances (PFAS) and organochlorine pesticides (OCPs) in surface sediments were investigated from the Bering Sea, the Chukchi Sea and adjacent Arctic Ocean in 2010. Total concentrations (dry weight) of Σ14PFAS in surface sediments (0.85 ± 0.22 ng g−1) of the Bering Sea were lower than that in the Chukchi Sea and adjacent Arctic Ocean (1.27 ± 0.53 ng g−1). Perfluoro-butanoic acid (P ...
DOI:
10.1016/j.chemosphere.2019.06.219

19. Emerging per- and polyfluoroalkyl substances (PFASs) in surface water and sediment of the North and Baltic Seas

Author:
Joerss, Hanna; Apel, Christina; Ebinghaus, Ralf
Source:
The Science of the total environment 2019 v.686 pp. 360-369
ISSN:
0048-9697
Subject:
perfluorooctanoic acid,   etc   ; carboxylic acids; isomers; perfluorocarbons; perfluorooctane sulfonic acid; pollutants; sediments; sulfonic acid; surface water; Baltic Sea; North Sea;     Show all 11 Subjects
Abstract:
... Along with the phase-out of legacy long-chain perfluoroalkyl carboxylic acids (PFCAs), perfluoroalkane sulfonic acids (PFSAs) and their precursors, attention has been drawn to emerging per- and polyfluoroalkyl substances (PFASs). This study is aimed at investigating the importance of selected emerging PFASs as pollutants in European coastal environments and a possible transition from legacy long-c ...
DOI:
10.1016/j.scitotenv.2019.05.363

20. Screening of textile finishing agents available on the Chinese market: An important source of per- and polyfluoroalkyl substances to the environment

Author:
Mumtaz, Mehvish; Bao, Yixiang; Li, Wenchao; Kong, Lingxiao; Huang, Jun; Yu, Gang
Source:
Frontiers of environmental science & engineering 2019 v.13 no.5 pp. 67
ISSN:
2095-2201
Subject:
perfluorooctanoic acid,   etc   ; clothing; electrochemistry; guidelines; manufacturing; markets; oils; perfluorocarbons; perfluorooctane sulfonic acid; risk; screening; surfactants; surveys; textile finishes; China;     Show all 15 Subjects
Abstract:
... Organofluorinated surfactants are widely employed in textile finishing agents (TFAs) to achieve oil, water, and stain repellency. This has been regarded as an important emission source of per-and polyfluoroalkyl substances (PFASs) to the environment. China is the biggest manufacturer of clothes, and thus TFA production is also a relevant industrial activity. Nevertheless, to date, no survey has be ...
DOI:
10.1007/s11783-019-1145-0