The continued pressure for expanding the exploration of natural resources in the past decades has increased the risk of environmental impacts with little understanding of ecosystem resilience. My research focuses on using isotopic, molecular, and organic geochemical techniques to elucidate the role of natural and anthropogenic stressors on marine environments.

My research applies different chemical techniques to very different ecosystems, functional groups, and sample types to answer questions related to the source, fate, and levels of organic contaminants, natural disturbances, and ecological interactions.

Below are some of the analytical methods that I use in my research:

  • Lipid Analysis: Molecular and isotopic composition of lipids in microorganisms and plants (Phospholipid fatty acids, n-alkane of leaf waxes) using GC-FID, GC-MS, GC-IRMS. Low molecular weight fatty acids in pore-waters using HPLC analysis. Polycyclic aromatic hydrocarbons, hopanes, steranes/diasteranes in sediments, water, fishes, and marine invertebrates using GC-MS/MS-MRM analysis.
  • Colorimetric Chemical Analysis: porewater (Chla, H2S, NH4+, PO43-, NO3, NO2), and sediments (Chla, total phosphorus),
  • Stable isotopes: Carbon and nitrogen in solid phase (13C,15N; Elemental Analyzer coupled to isotope ratio mass spectrometer),  and water (dD, 18O; integrated-cavity output spectroscopy); high vacuum extraction lines for plants and sediments water extraction, carbon and nitrogen metabolism (5N2, 15NO3, 13C-bicarbonate incorporation).