Lecture 3 12.755 Chemical Speciation cont. Note: Review paper Vraspir and Butler 2009. Some general paper topic areas. Specific geochemistry of element(s) Sources/sinks (rivers, dust, hydrothermal, sedimentary) Influences of metal(s) on primary productivity or other biological processes
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Note: Review paper Vraspir and Butler 2009
To actually calculate ligand concentrations, and Kcond titration data is analyzed using Scatchard plots or van den Berg/Ruzic plot, or non-linear fitting
Cobalt ligands in seawater have a biological source (Production of ligands in a Synechococcus feature in the Costa Rica Upwelling DomeSaito et al., Limnol Oceanogr 2005)
“These observations suggest that the phytoplankton community is readily able to access dissolved Fe from the FeL1 complex, resulting in excess L1 between dissolved Fe and L1 ligand concentrations in samples with intermediate dissolved Fe, and this is a seemingly ubiquitous feature of dissolved Fe cycling in the marine environment.”