Biogeochemical Cycling at Aquifer-Wetland Mixing Interfaces
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Peepers
"Peeper" is the
non-acronym term for a passive, diffusion-sampler that utilizes a
membrane to hold purified water within the sampler while allowing the
water to equilibrate with dissolved constituents in adjacent saturated
environments. Our
peepers have a total of 75 horizontal ports with apertures and spacings
of 0.5-cm, spanning a vertical profile of 75 cm of depth. The
peeper design allows us to obtain discrete water samples at small
spatial resolution by preventing vertical mixing of adjacent water
masses. Peepers are driven into the sediment, allowed to equilibrate for
two weeks, and then extracted and processed in the field under anaerobic
conditions.
PEEPER PHOTOS
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Small volumes (<10 L) of aqueous test solutions are injected (pushed) into the subsurface via small diameter drive-point wells. The solutions interact with constituents in the groundwater and the native microbial community and are then extracted from the same well. Reaction rates and processes can be inferred from changes in the chemistry of the extracted waters. MINI PUSH-PULL PHOTOS
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UNDER CONSTRUCTION
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Scenes from field work at the research site. FIELD WORK PHOTOS
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