Environmental Chemistry
Aquatic Ecology
Investigating the ecological effects of biocides on nearshore fishes in the Gulf of Mexico.

Conducting baseline studies to assess the impact of crude oil on seaweeds in the Pacific Ocean.

Documenting changes in species diversity and habitat related to impounding mountain streams.

Investigating organochlorine pesticide risks to the fauna inhabiting a restored estuary.

Assessing the changes in aquatic chemistry and native vegetation following wetland development.
Representative list of Dr. Marrin's project work
Tracking persistent man-made chemicals to identify the sources of river, aquifer, and coastal water pollution.

Developing biogenic gas analyses (e.g., methane, carbon dioxide,
hydrogen sulfide) to assess pollutant degradation pathways.

Pioneering the use of vapor-phase surveying to detect VOCs (e.g., fuels, solvents, fumigants) in groundwater aquifers.

Providing litigation support to attorneys on environmental cases involving chemical pollution and resource allocation.

Comparing the available options for disposing wastewater effluents in
island, desert, and coastal environments.

Assessing the potential for landfill gas migration to impact groundwater underlying an active solid waste facility.

Critiquing the design and performance of groundwater remediation (e.g., vapor extraction, bioaugmentation, chemical oxidation) techniques.

Developing sample collection and analysis protocols to identify probable sources of raw sewage in coastal waters.

Utilizing natural and anthropogenic tracers to evaluate the extent and locations of submarine discharge from coastal aquifers.

Evaluating the inorganic chemistry of coastal aquifers to document
seawater intrusion or evaporite dissolution processes.

Locating sources (recharge areas) and identifying chemical/physical properties of mountain spring waters.

Monitoring the concentrations of organic acids and electron acceptors to predict and prevent biofouling in a wastewater treatment system.

Projecting the effects of geological carbon sequestration on shallow aquifers overlying the storage reservoirs (i.e., formation cap rocks).