trace metal distribution in the water column along 40°s christian schlosser, jessica klar, ebby...
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Trace metal distribution in the water column along 40°S
Christian Schlosser, Jessica Klar, Ebby Desai, and Eric Achterberg
National Oceanography Centre Southampton
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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)
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• 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 HNO3
• 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
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• 20 ml sample• Standard addition• 1 day equilibration• Dowex anion exchange resin • 2 ml elution with 1.5 M HNO3
• Measured on XSeries ICPMS
- Standard addition Ag
1.5 M HNO3
Preconcentration for Ag
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Preliminary Results
0 10 20 30 400
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Ag (pmol L-1)
Dep
th (m
)
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Ag (pmol L-1)
Dep
th (m
)
0 10 20 30 400
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3500
Ag (pmol L-1)
Dep
th (m
)
0 10 20 30 400
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Ag (pmol L-1)
Dep
th (m
)
Sta. 20 Sta. 13 Sta. 11
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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)
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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