Trace element stoichiometry of marine plankton & its effect ... - IMBER
Trace element stoichiometry of marine plankton & its effect ... - IMBER
Trace element stoichiometry of marine plankton & its effect ... - IMBER
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Technical challenges determining <strong>plankton</strong> trace metal <strong>stoichiometry</strong><br />
‣Separating living from detrital/lithogenic material; contribution <strong>of</strong><br />
various organisms to a given size classes<br />
‐ Laboratory (cellular <strong>stoichiometry</strong>) vs. field estimates (bulk)<br />
‣ Intracellular vs. extracellular trace metals; i.e. uptake vs. adsorption<br />
‣Normalizing cellular trace metal concentrations: P vs. C<br />
‣Measurements are time consuming and potentially expensive<br />
ICPMS: multi-<strong>element</strong> in situ & lab; (extra- intra-cellular wash; lithogenic<br />
ICPMS: multi-<strong>element</strong> in situ & lab; (extra-, intra-cellular wash; lithogenic<br />
contamination)<br />
SXRF: metal <strong>stoichiometry</strong> and mapping <strong>of</strong> individual cells in situ & lab<br />
Radiotracers: physiological studies (uptake, recycling, storage...)
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