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Silicon Isotope data for GEOTRACES Cruise TN303

Responsible investigator

Mark Brzezinski ¹ , Janice L Jones ²

¹ University of California Santa Barbara Department of Ecology, Evolution and Marine Biology(United States)
² University of California, Santa Barbara, Marine Science Institute (United States)

Acquisition description:

Sampling methodology

Water samples were collected with a conventional CTD and rosette as Si isotopes are not contamination prone. Water samples were filtered through a polyethersulfone filter cartridge directly from each sampling bottle using silicon tubing and stored in either high density polyethylene or polypropylene bottles that were pre-cleaned by an overnight soak in 10% ACS grade HCl and rinsed with high purity deionized distilled water (> 18 M? - cm) and stored at room temperature.

Analytical methodology

Analytical methodology followed Brzezinski et al. (2006). Briefly: Fill 5µL wiretrol to 0.5µL with cesium fluorosilicate sample and transfer to Kiel vial. Rinse sample down to bottom of vial with ethanol. Dry in oven at 100 °C for 2 hours. Grease rim of vials with Krytox and return tray to oven. Heat to >150 °C for at least 2 hours to burn off HF and completely remove any moisture.

Put tray in N ₂ purged Kiel box and let sit for 24hours with N2 flowing continuously into the box. After 24 hours, turn on chiller and cool box to 3°C before starting run. Multiple runs with standard deviation <0.05 are acceptable, some samples may need to be run more than 3 times. The laboratory standard is Big Batch (BB). BB is run approximately every 8 samples.

References Cited

Brzezinski, M. A., J. L. Jones, C. P. Beucher, and M. S. Demarest. 2006.  Automated determination of silicon isotope natural abundance by the acid decomposition of cesium hexafluosilicate. Anal. Chem. 78: 6109-6114. DOI: 10.1021/ac0606406

BODC Data Processing Procedures

Data were received in the GEOTRACES DOoR template and were loaded using established BODC data banking procedures.