PhD Dissertation Defense - Monti Zimmerman - Environmental Science & Policy

PhD Dissertation
Department of Environmental Science and Policy
College of Science
George Mason University

Candidate: Monti Zimmerman
Defense Date and Time: August 18, 2026 at 1:00pm
Defense Location: David King Hall Rm 3006 and virtual on Zoom
Title: Fate, Remediation, and Policy of Heavy Metals (Hexavalent Chromium & Molybdenum) in Thailand’s Surface Waters

Dissertation Director: Dr. Esther Peters
Committee: Dr. Jennifer L. Salerno, Dr. Vivek Prasad, Dr. Sarah Pettito

ABSTRACT

This dissertation research evaluated two heavy metals in Thailand: first, analyzed hexavalent chromium concentration data in the Chao Phraya River system, including the tributary rivers of the Ping, Wang, Yom, and Nan Rivers, and second, assessed a contamination case in the Lum Nam Jone Reservoir in Chachoengsao Province, with pH 2.8 caused by a company processing molybdenite into pure molybdenum using ferric chloride. Accountability and remediation under their laws and policies highlights types of challenge that may occur in chemical contaminant research. Establishing clear, strong laws that do not inhibit government oversight while ensuring compliance creates a difficult balance.