全氟烷基和多氟烷基物质(PFAS)是数千种化学物质的大家族,其中许多已经使用非目标飞行时间和Orbitrap质谱方法进行了鉴定。复杂PFAS混合物的全面表征对于评估其环境迁移至关重要。改造,暴露,和吸收。因为21特斯拉(T)傅里叶变换离子回旋共振质谱(FT-ICRMS)在很宽的分子量范围内提供最高的可用质量分辨能力和亚ppm质量误差,我们开发了一种非靶向21TFT-ICRMS方法,以使用可疑筛查来筛查水性成膜泡沫(AFFF)中的PFAS,目标公式数据库(C,H,Cl,F,N,O,P,S;≤865Da),同位素同位素,和肯德里克相似的质量差网络(KAMDNs)。天然有机物(NOM)样品中PFAS鉴定的假阳性,作为阴性对照,建议在注释具有阳性质量缺陷的CF2同源系列时,应施加最小长度3。在可疑筛查期间,我们推定确定了163个已知的PFAS,以及134种非靶向筛选过程中的新型PFAS,包括疑似聚乙氧基化全氟烷烃磺酰胺系列。这项研究表明,21TFT-ICRMS分析可以提供对复杂PFAS组成的独特见解,并扩展我们对受影响基质中PFAS化学的理解。
Per- and polyfluoroalkyl substances (PFASs) are a large family of thousands of chemicals, many of which have been identified using nontargeted time-of-flight and Orbitrap mass spectrometry methods. Comprehensive characterization of complex PFAS mixtures is critical to assess their environmental transport, transformation, exposure, and uptake. Because 21 tesla (T) Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) offers the highest available mass resolving power and sub-ppm mass errors across a wide molecular weight range, we developed a nontargeted 21 T FT-ICR MS method to screen for PFASs in an aqueous film-forming foam (AFFF) using suspect screening, a targeted formula database (C, H, Cl, F, N, O, P, S; ≤865 Da), isotopologues, and Kendrick-analogous mass difference networks (KAMDNs). False-positive PFAS identifications in a natural organic matter (NOM) sample, which served as the negative control, suggested that a minimum length of 3 should be imposed when annotating CF2-homologous series with positive mass defects. We putatively identified 163 known PFASs during suspect screening, as well as 134 novel PFASs during nontargeted screening, including a suspected polyethoxylated perfluoroalkane sulfonamide series. This study shows that 21 T FT-ICR MS analysis can provide unique insights into complex PFAS composition and expand our understanding of PFAS chemistries in impacted matrices.