Unique Solid Phase Microextraction Sampler Reveals Distinctive Biogeochemical Profiles among Various Deep-Sea...

Area of Science:

• Marine Biology
• Geochemistry
• Analytical Chemistry

Background:

• Deep-sea hydrothermal vents are crucial ecosystems for biogeochemical cycling.
• Current analytical methods for vent fluids have limitations in detecting labile organic compounds due to sampling and preservation challenges.

Purpose of the Study:

• To develop and demonstrate a novel in situ solid phase microextraction (SPME) sampler for deep-sea hydrothermal vent fluids.
• To improve the detection of labile organic compounds and biomarkers in these extreme environments.

Main Methods:

• Deployment of a unique SPME sampler to collect organic compounds directly from vent fluids at multiple deep-sea locations.
• Analysis of extracted compounds using high-resolution liquid chromatography-tandem mass spectrometry (LC-MS/MS).

Main Results:

• Successful in situ extraction of a diverse range of organic compounds, including labile dissolved organic sulfur compounds.
• Identification of biomarkers indicative of anammox bacteria, fungi, and lower animals.
• Demonstration of SPME's capability to overcome limitations of traditional water sampling methods.

Conclusions:

• Solid phase microextraction (SPME) is a viable and effective technique for in situ analysis of deep-sea hydrothermal vent fluids.
• This approach significantly enhances the understanding of deep-sea ecology and biogeochemical processes.
• The method allows for broader detection of crucial organic compounds and biomarkers previously missed.