Fluoride from PFAS/Breakdown Products

There are over 8000 perfluorinated compounds manufactured today...
Post Reply
pfpcnews
Posts: 744
Joined: Mon Apr 03, 2006 5:50 am

Fluoride from PFAS/Breakdown Products

Post by pfpcnews »

Singh RK(1), Fernando S(2), Baygi SF(2), Multari N(1), Thagard SM(1), Holsen TM(2). - "Breakdown Products from Perfluorinated Alkyl Substances (PFAS) Degradation in a Plasma-Based Water Treatment Process"
Environ Sci Technol 53(5):2731-2738 (2019)

Author information:
(1)Plasma Research Laboratory, Department of Chemical and Biomolecular Engineering , Clarkson University , Potsdam , New York 13699 , United States.
(2)Department of Civil and Environmental Engineering , Clarkson University , Potsdam , New York 13699 , United States.

Byproducts produced when treating perfluorooctanoic acid (PFOA) and perfluorooctanesulfonate (PFOS) in water using a plasma treatment process intentionally operated to treat these compounds slowly to allow for byproduct accumulation were quantified. Several linear chain perfluoroalkyl carboxylic acids (PFCAs) (C4 to C7) were identified as byproducts of both PFOA and PFOS treatment. PFOA, perfluorohexanesulfonate (PFHxS), and perfluorobutanesulfonate (PFBS) were also found to be byproducts from PFOS degradation. Significant concentrations of fluoride ions, inorganic carbon, and smaller organic acids (trifluoroacetic acid, acetic acid, and formic acid) were also identified. In addition to PFCAs, PFHxS, and PFBS, trace amounts of 43 PFOA-related and 35 PFOS-related byproducts were also identified using a screening and search-based algorithm. Minor concentrations of gas-phase byproducts were also identified (<2.5% of the F originally associated with the parent molecules) some of which are reported for the first time in perfluoroalkyl substance degradation experiments including cyclic perfluoroalkanes (C4F8, C5F10, C6F12, C7F14, and C8F16). The short chain PFCAs detected suggest the occurrence of a stepwise reduction of the parent perfluoroalkyl substances (PFAS) molecule, followed by oxidation of intermediates, perfluoroalkyl radicals, and perfluoro alcohols/ketones. Using a fluorine mass balance, 77% of the fluorine associated with the parent PFOA and 58% of the fluorine associated with the parent PFOS were identified. The bulk of the remaining fluorine was determined to be sorbed to reactor walls and tubing using sorption experiments in which plasma was not generated.

DOI: 10.1021/acs.est.8b07031
PMID: 30768259 [Indexed for MEDLINE]
Last edited by pfpcnews on Mon Nov 30, 2020 4:14 pm, edited 1 time in total.
admin
Site Admin
Posts: 2784
Joined: Tue Jan 18, 2005 10:25 pm

Re: Fluoride from PFAS/Breakdown Products

Post by admin »

SEE ALSO:

Li F, Chen YD, Zhou ZM, Liao XB, Ma HF, Yuan BL - "Anaerobic Biodegradability of Perfluorooctanoic Acid (PFOA)" Huan Jing Ke Xue 37(12):4773-4779 (2016) Chinese. doi: 10.13227/j.hjkx.201603155. PMID: 29965320
https://pubmed.ncbi.nlm.nih.gov/29965320/

Hao J, Wang P, Kang Y, He H, Luo H, Kim S, Niu L, Jiang H, Ma K - "Degradation of Perfluorooctane Sulfonamide by Acinetobacter Sp. M and Its Extracellular Enzymes" Chem Asian J 14(16):2780-2784 (2019) doi: 10.1002/asia.201900638. Epub 2019 Jul 16. PMID: 31207187
https://pubmed.ncbi.nlm.nih.gov/31207187/

Zhang W, Efstathiadis H, Li L, Liang Y - "Environmental factors affecting degradation of perfluorooctanoic acid (PFOA) by In2O3 nanoparticles" J Environ Sci (China). 93:48-56 (2020) doi: 10.1016/j.jes.2020.02.028. Epub 2020 Apr 4. PMID: 32446459
https://www.sciencedirect.com/science/a ... rss_sd_all
Last edited by admin on Mon Nov 30, 2020 4:14 pm, edited 1 time in total.
admin
Site Admin
Posts: 2784
Joined: Tue Jan 18, 2005 10:25 pm

FTOH & Dental Fluorosis

Post by admin »

Post Reply