Dr. Youn Jeong Choi is a Senior Analytical Chemist at Purdue University with specialized expertise in PFAS detection and quantification methodologies. With a Ph.D. in Environmental Organic Chemistry area, she has developed innovative analytical techniques for complex environmental matrices including biosolids, soil, and biological tissues. Her technical proficiency spans extraction protocols, chromatographic separation, and high-resolution mass spectrometry applications for PFAS and organic contaminant analysis. As PI and co-PI on projects funded by SERDP, USGS, and EPA, Dr. Choi has pioneered methods for analysing organic contaminant, PFAS precursors and their transformation products in challenging sample types. Her analytical innovations include efficient cleanup procedures, improved detection limits, and novel pre-treatment approaches for complex media. Dr. Choi's analytical methods have been instrumental in advancing understanding of fate and transport of contaminants in environmental systems.