Aquatic Sciences Meeting, Albuquerque 2001

SS08 Processes at the Benthic Interface (Environmental Connections)

Date: Monday, February 12, 2001, Time: 4:15:00 PM

Location: Ruidoso/Pecos

Davison, W, , Lancaster University, Environmental Sciences, Lancaster, LA1 4YQ, United Kingdom, w.davison@lancaster.ac.uk

Motelica-Heino, M, , Lancaster University, Environmental Sciences, Lancaster, LA1 4YQ, United Kingdom,

Fones, G, , Lancaster University, Environmental Sciences, Lancaster, LA1 4YQ, United Kingdom,

Zhang, H, , Lancaster University, Environmental Sciences, Lancaster, LA1 4YQ, United Kingdom,

MICROSTRUCTURE OF TRACE METALS IN MARINE AND LACUSTRINE POREWATERS

Measurements using laser ablation ICP-MS on gel sheets from in situ deployments of DGT and DET (diffusive gradients and equilibration in thin-films) have shown pronounced pore-water structure on the sub-mm scale. Analytical control data and supporting results are presented to validate the accuracy of the measurements. The observed very fine one-dimensional structure and two-dimensional images are consistent with solute mobilization in microniches with diameters no larger than a few hundred microns. Introduction of the structure by operational artifacts can be discounted, as the prevalence of the microniches is dependent on the productivity of the system. Geochemical interdependencies are clearly seen at this resolution. There are links between Mn and Co and Fe and As, consistent with redox controls. However, other processes can also determine the fine structure, including solubility controls for Co and Ni and presumed C mineralisation.

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Aquatic Sciences Meeting, Albuquerque 2001

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