Facile identification of fluorosurfactant category in aqueous film-forming foam concentrates via optimized^(19)F NMR  

作　　者：Peiyao Chen Shuang Zhuang Weiguang Chen Zhijian Chen Rongzhen Li Fangyu Chen Tingting Jiang Xiaobin Fu 

机构地区：[1]Tianjin Fire Research Institute of MEM,Tianjin,300381,China [2]Department of Chemistry,School of Science,Tianjin University,Tianjin,300354,China [3]Department of Chemistry,School of Science,Tianjin Chengjian University,Tianjin,300384,China [4]Department of Molten Salt Chemistry and Engineering,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai,201800,China

出　　处：《Magnetic Resonance Letters》2024年第3期42-51,共10页磁共振快报（英文）

基　　金：financially supported by the“National Key R&D Program of China”(No.2022YFC3004900);“Basic Research Fund of TFRI”(No.2022SJ07)。

摘　　要：Aqueous film-forming foams(AFFFs)are the primary source of toxic perfluoroalkyl and polyfluoroalkyl substances(PFAS)in wastewater.Thus,it is urgent to develop a facile and fast method for identifying fluorosurfactants in commercially available AFFFs.In this work,fluorine nuclear magnetic resonance(^(19)F NMR)spectroscopy was optimized to measure AFFFs directly with the extra addition of 5%D_(2)O as the locking reagent,and high-quality spectra could be acquired within 4 min(0.1%fluorosurfactant content).Recovery experiments demonstrated that the use of different AFFFs had no marked influence on the quantitative analysis of fluorosurfactants.Such method works with low-field NMR spectroscopy(1.4 T)as well.Two-dimensional(2D)^(19)F COSY NMR was used to make signal assignments for different fluorosurfactant derivatives.The optimized ^(19)F NMR could quantify the commercially available fluorosurfactants in different AFFFs,identify them being in either the perfluorooctane sulfonate(PFOS)or fluorotelomer sulfonic acid(FTS)categories,and distinguish the head-group of PFOS and FTS derivatives,which exhibits great potentials in the developments of relevant commercial detections.

关 键 词：Aqueous film-forming foams FLUOROSURFACTANTS 19F NMR Perfluorooctane sulfonate 

分 类 号：TQ423[化学工程] O657.2[理学—分析化学] O482.532[理学—化学]