WESTERN CAROLINAS ACS SEMINAR
FREE TO THE PUBLIC!
"Reactive Oxygen Species at the Margins: Sedimentary Biogeochemical
Processes Extend the Reach of Free Radicals Away from Sunlight”
University of South Carolina
THURSDAY, JANUARY 25, 2018
University of South Carolina Upstate
E Campus Blvd, Spartanburg, SC 29303
Olin B. Sansbury, Jr. Campus Life Center, Room 310 (Ballroom)
Order of Events:
6:00 pm - Meet and Greet
6:30 pm – Optional Dinner
$18 Members/$5 High School Teachers and Student Members
Ø Fresh baked dinner rolls
Ø Sesame chicken breast*
Ø French green beans and carrot medley
Ø Oven-roasted sweet potatoes
Ø Chocolate fudge cake
Ø Coffee and tea
*A vegetarian option is available upon request
7:30 pm - Lecture
**We ask that you RSVP if you are attending the seminar and/or having dinner.
Please RSVP by THURSDAY, JANUARY 18, 2018 to: email@example.com and leave your name, affiliation, contact number or email address, how many will be attending seminar and/or dinner and if student or high school teacher status is applicable.
Reactive oxygen species (ROS, including superoxide, hydrogen peroxide, and hydroxyl radical) are critical for enabling abiotic reaction paths between organic carbon and atmospheric oxygen in surface waters. Abiotic ROS production in seawater is usually attributed to photoprocesses involving the direct reduction of oxygen by photoexcited natural organic matter or by Fe(II) generated by photoinduced ligand to metal charge transfer. In the latter case, oxidizable ligands can include a wide variety of organic molecules and some ligands that are not ordinarily considered reductants, including water and chloride. However, there are other abiotic sources of reductive equivalents that can reduce Fe(III) to Fe(II) without the need for sunlight; including hydrogen sulfide, polysulfides, some forms of organic carbon (e.g., polyhydroxylated phenols, organothiols etc.), and superoxide. Our own interest in Fe(II) is associated with the tidally driven efflux of anoxic porewater and this has led us to investigate the potential for ROS formation as a consequence of the non-photochemical reduction of Fe(III) by sulfide and other reduced sulfur species. Here we focus on the impact of sulfide oxidation on the ferric/ferrous iron system given its relative geographical importance, kinetic facility, and potential for generating ROS.
About our speaker
John Ferry grew up in Southern Illinois and graduated from the University of Illinois with a BS in Chemistry in 1990. He then moved to North Carolina for graduate work at UNC-Chapel Hill in the Department of Environmental Sciences and Engineering. After a post-doctoral appointment in the Chemistry Department at UT-Austin he began his faculty career in the Chemistry department at USC-Columbia in 1998.