1. Trace metal distribution in the water column along 40°S Christian Schlosser, Jessica Klar, Ebby Desai, and Eric Achterberg National Oceanography Centre Southampton

2. Cruise Track and Sampling Positions UK GEOTRACES 40°S RRS James Cook JC068 (Dec. 2011 - Jan. 2012) 15 Ti casts (full depth) 2 Ti cast (1000m) ~ 150 surface sites Trace Metal Sampling Ti rosette frame with trace metal clean OTE bottles and self-triggering bottle closure system Fish Analysis Dissolved and total dissolvable Fe, Cd, Pb, Cu, Ni, (Zn) by ID-ICP-MS Dissolved and total dissolvable Ag, Mn (Co) by standard addition ICP-MS Dissolved and total dissolvable Al by flow injection fluorescence (Brown and Bruland, 2008)

3. 3 12 ml sample Spiked with isotope mixture Standard addition for mono-isotopic elements (Co, Mn) UV digestion Chelating resin WAKO 1 ml elution with 1.5 M HNO 3 Measured on XR Element II HR ICPMS - 100 µl isotope mix - Standard addition Co/Mn - Buffer 1.5 M HNO3 Preconcentration for Multi Element Analysis

4. 4 20 ml sample Standard addition 1 day equilibration Dowex anion exchange resin 2 ml elution with 1.5 M HNO 3 Measured on XSeries ICPMS - Standard addition Ag 1.5 M HNO3 Preconcentration for Ag

5. Preliminary Results Sta. 20Sta. 13Sta. 11

6. Work in Progress Multi trace element analysis of surface and subsurface samples from JC068 and D357 by isotope dilution/standard Addition ICP-MS (end of October this year) Fe ligand analysis (beginning of next year) Fluorescence dissolved organic matter (FDOM) (beginning of next year)

7. 7 Preconcentration Chelating resin WAKO (similar to NOBIAS Chelate PA1) methacrylate resin carboxymethylated pentaethylenehexamine (CM-PEHA resin) Excellent Mn measurements: stable Mn calibration slopes Kagaya et al., Talanta 2009, 79: 146-152