[Eoas-seminar] MS Defense - Cecil

[eoas-seminar at lists.fsu.edu]

Good afternoon,

Please join us for Marie Cecil's MS Defense on Monday, March 9th from 1-4 PM (EST).

Title: INVESTIGATING SPATIAL VARIATIONS OF PESTICIDE CHLOROTHALONIL AND MAJOR ION CONCENTRATIONS AND ANALYZING IMPACTS OF CHLOROTHALONIL ON MAJOR ION CONCENTRATIONS IN IMMOKALEE, FLORIDA


Name: Marie Cecil

Date: Monday, March 9th, 1:00 - 4:00 PM

Location: EOA 4067

Major Professor: Dr. Ming Ye
Zoom link: https://fsu.zoom.us/j/98758244890<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>

The meeting ID for the zoom is: Meeting ID 987 5824 4890

Abstract:
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-, Cl-, NO2-, NO3-, PO43-, SO42-, Na+, K+, Ca2+, and Mg2+) 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.


Best,
Adea

Adea Arrison
Sr. Academic Program Specialist
Department of Earth, Ocean & Atmospheric Science
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