Iron

For the iron biogeochemistry project, seawater samples are collected during voyages on board the RV SA Agulhas II. A GEOTRACES compliant trace metal clean CTD housed on an epoxy coated aluminium frame rosette with titanium bolts, equipped with 24 x 12L GO-FLO bottles, controlled by a Kevlar cable winch is used to conduct profile sampling of the water column. Subsampling is conducted inside a certified class 100 trace metal clean container lab equipped with circulating HEPA filters for trace metal clean air supply. Concentrations of dissolved Fe (DFe, filtered through 0.22 µm) and soluble Fe (SFe, filtered through 0.02µm) are measured using a Flow Injection Analyser (FIA) with chemiluminescence detection inside a trace metal clean class 100 laboratory. Samples for particulate Fe (PFe, filtered onto 0.45 µm) are acid reflux digested and analysed at LEMAR, France following GEOTRACES protocols and measured by sector field ICP-MS.

 

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For the iron biogeochemistry project, seawater samples are collected during voyages on board the RV SA Agulhas II. A GEOTRACES compliant trace metal clean CTD housed on an epoxy coated aluminium frame rosette with titanium bolts, equipped with 24 x 12L GO-FLO bottles, controlled by a Kevlar cable winch is used to conduct profile sampling of the water column. Subsampling is conducted inside a certified class 100 trace metal clean container lab equipped with circulating HEPA filters for trace metal clean air supply. Concentrations of dissolved Fe (DFe, filtered through 0.22 µm) and soluble Fe (SFe, filtered through 0.02µm) are measured using a Flow Injection Analyser (FIA) with chemiluminescence detection inside a trace metal clean class 100 laboratory. Samples for particulate Fe (PFe, filtered onto 0.45 µm) are acid reflux digested and analysed at LEMAR, France following GEOTRACES protocols and measured by sector field ICP-MS.