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<p class="MsoNormal"><span style="font-size:14.0pt">Good afternoon, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Please join us for Marie Cecil’s MS Defense on Monday, March 9<sup>th</sup> from 1-4 PM (EST).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:black">Title:</span></b><span style="font-size:14.0pt;color:black"> INVESTIGATING SPATIAL VARIATIONS OF PESTICIDE CHLOROTHALONIL AND MAJOR ION CONCENTRATIONS AND ANALYZING IMPACTS OF CHLOROTHALONIL
ON MAJOR ION CONCENTRATIONS IN IMMOKALEE, FLORIDA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="elementtoproof" style="background:white"><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:black">Name: Marie Cecil</span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:black">Date: Monday, March 9<sup>th</sup>, 1:00 – 4:00 PM</span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:black">Location: EOA 4067</span><span style="font-size:14.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:black">Major Professor: Dr. Ming Ye<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:black">Zoom link: <a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffsu.zoom.us%2Fj%2F98758244890&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Ce12e4b45c83c478ca58b08de788a3938%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639080732212914978%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Dv%2FUy%2F2u9COL0mV93Ix%2BSNLC%2F4eB0BmsUSebtYZqe%2Bo%3D&reserved=0" originalsrc="https://fsu.zoom.us/j/98758244890">
https://fsu.zoom.us/j/98758244890</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:black">The meeting ID for the zoom is: Meeting ID 987 5824 4890<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:black">Abstract: <o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:14.0pt;color:black">Chlorothalonil, an organochlorine fungicide, has been used widely in agricultural fields, including south Florida, where (in terms of acreage), 100% of Florida’s sugarcane, 42% of vegetables, and
38% of citrus are produced. Chlorothalonil used for agriculture enters the surrounding natural environment and may have impacts on water chemistry. The impacts of chlorothalonil on major ions in surface waters have not been well understood, especially in natural
conditions. Based on published laboratory studies, the hypothesis of this study is that, under the field conditions of the study site, chlorothalonil concentrations are negatively correlated with chloride ion concentrations, positively correlated with nitrate
ion concentrations, and positively correlated with phosphate ion concentrations. To test the hypotheses, surface water samples were collected on June 20th and June 21st, 2025, within the study site, Immokalee, Florida, an agriculturally relevant community
in south Florida. Tandem liquid chromatography mass spectrometry (LC-MS/MS) analysis determined chlorothalonil concentrations in selected surface water samples from the study site. Ion chromatography analysis determined major ion concentrations (Fl<sup>-</sup>,
Cl<sup>-</sup>, NO<sub>2</sub><sup>-</sup>, NO<sub>3</sub><sup>-</sup>, PO<sub>4</sub><sup>3-</sup>, SO<sub>4</sub><sup>2-</sup>, Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, and Mg<sup>2+</sup>) in selected surface water samples collected from the study
site. Data analysis was utilized to examine existing major ion and chlorothalonil concentration data in surface waters within the South Florida Water Management District’s (SFWMD) DBHYDRO database for the greater south Florida region. Spatial variations for
chlorothalonil concentrations and ion concentrations across selected surface water samples were determined. Results illustrate a low positive correlation (0.216) between chloride and chlorothalonil, a low negative correlation (-0.143) between nitrate and chlorothalonil,
and a moderate positive correlation (0.418) between phosphate and chlorothalonil in surface water bodies in Immokalee, Florida. This research shows that selected major ion concentrations may be used as a practical indicator for chlorothalonil’s impacts on
surface water chemistry.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Best, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Adea<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Adea Arrison<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Sr. Academic Program Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Department of Earth, Ocean & Atmospheric Science<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.eoas.fsu.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Ce12e4b45c83c478ca58b08de788a3938%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639080732212939137%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=bz915oOj%2BY%2BRfxOLQgaqJzo1DQa5BKszsa3lqpn7ulQ%3D&reserved=0" originalsrc="https://www.eoas.fsu.edu/"><span style="font-size:11.0pt;color:blue;text-decoration:none"><img border="0" width="92" height="55" style="width:.9583in;height:.5729in" id="Picture_x0020_1" src="cid:image001.png@01DCAA49.2D2B76F0"></span></a><span style="font-size:11.0pt"><o:p></o:p></span></p>
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