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Full-Text Articles in Physical Sciences and Mathematics
Assessment Of The Occurrence And Potential Risks Of Antibiotics And Their Metabolites In South Florida Waters Using Liquid Chromatography Tandem Mass Spectrometry, Venkata Reddy Panditi
Assessment Of The Occurrence And Potential Risks Of Antibiotics And Their Metabolites In South Florida Waters Using Liquid Chromatography Tandem Mass Spectrometry, Venkata Reddy Panditi
FIU Electronic Theses and Dissertations
An automated on-line SPE-LC-MS/MS method was developed for the quantitation of multiple classes of antibiotics in environmental waters. High sensitivity in the low ng/L range was accomplished by using large volume injections with 10-mL of sample. Positive confirmation of analytes was achieved using two selected reaction monitoring (SRM) transitions per antibiotic and quantitation was performed using an internal standard approach. Samples were extracted using online solid phase extraction, then using column switching technique; extracted samples were immediately passed through liquid chromatography and analyzed by tandem mass spectrometry. The total run time per each sample was 20 min. The statistically calculated …
Assessment Of Submerged Vegetation As Indicators Of Irgarol Contamination, Melissa V. Fernandez
Assessment Of Submerged Vegetation As Indicators Of Irgarol Contamination, Melissa V. Fernandez
FIU Electronic Theses and Dissertations
Irgarol 1051 is a common antifoulant toxic to certain marine organisms. Submerged aquatic vegetation (SAV) are exposed to this herbicide when it leaches into the marine environment from painted structures, making SAVs ideal candidates to function as sentinel indicator of contamination. In the initial stage of this study, Coconut Grove and Key Largo Harbor were assessed for environmental exposure to Irgarol. Water, sediment and SAVs were collected, the latter two subject to automated solid phase extraction, and all samples analyzed by GC/MS-SIM for Irgarol and its metabolite, M1. Of the vegetation analyzed, Halodule and Syringodium had the highest capacity to …