Assessment of EPA Method 1633 and Predecessor Techniques for PFAS Analysis

Presentation Description: PFAS have gained prominence concerning environmental contaminants, prompting the need for accurate and comprehensive testing methodologies. This abstract presents a comparative evaluation between the well-established EPA Method 1633 and earlier techniques for PFAS analysis. Furthermore, it delves into the lessons,specifically in the context of Publicly Owned Treatment Works (POTWs) in California. EPA Method 1633 represents a significant advancement in PFAS analysis, incorporating robust solid-phase extraction (SPE) techniques followed by high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Its comprehensive approach enables the simultaneous quantification of a broad range of PFAS compounds, offering insights into the prevalence and distribution of various PFAS species. Method 1633's expanded compound coverage provides a complete picture of PFAS contamination scenarios at POTWs. Previous methods utilized alternative analytical approaches, often focusing on individual PFAS compounds or a limited set of analytes. Such methods may have employed older technologies that lacked the sensitivity and specificity of modern instrumentation, like HPLC-MS/MS. The scope of previous methods was often constrained to a few specific PFAS compounds, such as perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). Consequently, these methods provided a narrower view of PFAS contamination, potentially missing contributions from other PFAS species. In the context of California's POTWs, the selection of an appropriate PFAS analysis method is pivotal. Method 1633's ability to analyze multiple PFAS compounds aligns well with California's rigorous environmental regulations. By capturing regulated compounds like PFOA and PFOS and emerging contaminants, Method 1633 offers a broader perspective that aligns with California's proactive approach to environmental protection. The lessons derived from comparing these methods underline the significance of comprehensive PFAS analysis in POTWs. Method 1633's versatility in accommodating evolving regulatory landscapes and capturing a broad spectrum of PFAS compounds is essential for making informed decisions regarding PFAS management and remediation strategies. These lessons resonate deeply in California, where the state's commitment to environmental stewardship necessitates adaptable and insightful analytical tools. This presentation highlights the merits of EPA Method 1633 for PFAS analysis and underscores its relevance for California POTWs. As California's regulatory framework continues to evolve, Method 1633 stands as an asset for accurate, forward-looking PFAS analysis in POTWs.