EARTHSC 8898 Dr. Alison MacKay - Structure Matters! Understanding the outsized role of organic matter in contaminant fate

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8898 Seminar-SP23-Allison MacKay
February 10, 2023
1:45PM - 3:00PM
Location
291 Mendenhall Laboratory

Date Range
Add to Calendar 2023-02-10 13:45:00 2023-02-10 15:00:00 EARTHSC 8898 Dr. Alison MacKay - Structure Matters! Understanding the outsized role of organic matter in contaminant fate Speaker: Alison MacKay Seminar Title: Structure Matters!  Understanding the outsized role of organic matter in contaminant fate Abstract: This presentation highlights outcomes from the creative inquiry of student advisees who each posed the question, “What is it about the structure of organic matter that is causing contaminants to degrade – or to sorb in unexpected ways?” Insights were discovered by applying tools to probe organic matter at the molecular level.  High resolution mass spectrometry showed the shifts in chemical formulae of organic matter components, following sequential drinking water treatment processes.  These observations were used to explain variability in harmful byproducts formed in the chlorine disinfection of drinking water.  Secondly, atomistic computational chemistry tools were used to visualize and quantify organic contaminant interaction energies with soil organic matter.  Results help to describe why organic matter shows unexpectedly high sorption of organic compounds with positive charge.  Collectively, these findings advance understanding of the role of organic matter in contaminant fate that have not been captured using bulk descriptors of these heterogeneous materials present in all aquatic systems. Host: Andrea Grottoli Zoom Link 291 Mendenhall Laboratory School of Earth Sciences earthsciences@osu.edu America/New_York public
Description

Speaker: Alison MacKay

Seminar Title: Structure Matters!  Understanding the outsized role of organic matter in contaminant fate

Abstract: This presentation highlights outcomes from the creative inquiry of student advisees who each posed the question, “What is it about the structure of organic matter that is causing contaminants to degrade – or to sorb in unexpected ways?” Insights were discovered by applying tools to probe organic matter at the molecular level.  High resolution mass spectrometry showed the shifts in chemical formulae of organic matter components, following sequential drinking water treatment processes.  These observations were used to explain variability in harmful byproducts formed in the chlorine disinfection of drinking water.  Secondly, atomistic computational chemistry tools were used to visualize and quantify organic contaminant interaction energies with soil organic matter.  Results help to describe why organic matter shows unexpectedly high sorption of organic compounds with positive charge.  Collectively, these findings advance understanding of the role of organic matter in contaminant fate that have not been captured using bulk descriptors of these heterogeneous materials present in all aquatic systems.

Host: Andrea Grottoli

Zoom Link