Web1 de nov. de 2024 · Specifically, it was characterized using targeted analysis, including the total oxidizable precursor (TOP) assay (Houtz and Sedlak, 2012). Samples were also analyzed by high performance liquid chromatography quadrupole-time of flight mass spectrometry (HPLC-QToF-MS) coupled with suspect screening. Web1 de out. de 2024 · To overcome the problems associated with the measurement of unknown precursors, the total oxidizable precursor (TOP) assay was developed in 2012 …
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Web17 de ago. de 2012 · Erika F. Houtz, Christopher P. Higgins, Jennifer A. Field, and David L. Sedlak. Persistence of Perfluoroalkyl Acid Precursors in AFFF-Impacted Groundwater … WebThe TOP (Total Oxidisable Precursor) assay by Houtz/Sedlak can help to determine the concentration of PFAS that cannot be covered by conventional analytical methods. greenbrier rail services llc
David L. Sedlak Civil and Environmental Engineering
Webanalysed by target analysis (Houtz and Sedlak 2012). Janda et al. modied the TOP assay in two ways (Janda et al. 2024). First, they adjusted the method for solid samples after prior extraction, and second they included ultrashort chain PFAS, such as triuoroacetic acid (TFA), expand-ing the spectrum of precursor capacity (Janda et al. 2024). Web15 de set. de 2024 · The underperformance of the previously published method is demonstrated by its inability to sufficiently digest PFAS within biosolids. Therefore, the … Web1 de fev. de 2024 · The amount of total oxidizable precursor was developed to examine the conversion of PFAA precursors in water (Houtz and Sedlak, 2012; Zhu and Kannan, 2024), which demonstrated the feasibility of the conversion process and that the precursors could be converted to PFCA at significant concentrations (Ye et al., 2014), even if their original … greenbrier public schools calendar