There are considerable number of unidentified Per- and Poly-fluoroalkyl substances (PFASs) found in environmental samples. Given this, there is a necessity to develope non-targeted screening methods. We develop and optimize different suspect and non-targeted screening methods in both negative and positive plarity modes of High Resolution Mass Spectrometry (Time of Flight) for a wide range of PFAS.
The on-going contamination of groundwater with poly- and perfluoroalkyl substances (PFAS) has resulted in a global and rapidly growing interest in PFAS groundwater remediation. We study the effectiveness and longevity of reactive nanocomposites of nNiFe-AC particles to degrade and defluorinate PFAS in 1-D flow column studies
Shorter chain perfluoroalkyl acids (PFAAs) are quite mobile and frequently detected in groundwater. While AFFF use, landfill leachate, and wastewater reuse have previousely been attributed to PFAS-contaminated groundwater, in our ongoing project, we investigate the possibilty of PFAS release from biosolids used as soil amendments into leachates; which consequently can contaminate grounwater.
Carbonyl sulfide (COS) and carbon disulfide (CS2) are volatile sulfur compounds that are critical precursors to sulfate aerosols, which enable climate cooling. COS and CS2 stem from the indirect photolysis of organic sulfur precursors in natural waters, but currently the chemistry behind how this occurs remains unclear. We evalute how different organic sulfur precursors, water quality constituents, which can form important reactive intermediates (RIs), and temperature affect COS and CS2 formation.
