Dataset: Dissolved REE concentrations and Nd isotopes reported by OSU researchers from samples collected on the GEOTRACES EPZT R/V Thomas G. Thompson cruise TN303 from November to December 2013

ValidatedFinal no updates expectedDOI: 10.1575/1912/bco-dmo.788195.1Version 1 (2020-01-23)Dataset Type:Cruise Results

Principal Investigator, Contact: Brian Haley (Oregon State University)

Co-Principal Investigator: Steven L. Goldstein (Lamont-Doherty Earth Observatory)

BCO-DMO Data Manager: Shannon Rauch (Woods Hole Oceanographic Institution)


Program: U.S. GEOTRACES (U.S. GEOTRACES)

Project: U.S. GEOTRACES East Pacific Zonal Transect (GP16) (U.S. GEOTRACES EPZT)

Project: Collaborative Research: GEOTRACES Pacific Section - Nd isotopes and REEs in the South Pacific (EPZT Nd REEs)


Abstract

Dissolved REE concentrations and Nd isotopes from the GEOTRACES EPZT R/V Thomas G. Thompson cruise TN303 from November to December 2013. This collaborative project was investigated by neodymium (Nd) isotope groups at Lamont-Doherty Earth Observatory (LDEO) and Oregon State University (OSU). The two groups analyzed samples at alternate stations. Samples in this dataset were processed and analyzed by the Nd isotope group at OSU. The LDEO samples are available as a related dataset (BCO-DMO dataset ...

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Samples were filtered, acidified, and split at sea. Samples were collected by Niskin bottle and the towed GeoFish. Refer to the EPZT cruise report for more information on cruise operations (http://dmoserv3.whoi.edu/data_docs/GEOTRACES/EPZT/GT13_EPZT_ODFReport_All.pdf). 

We prepared our 5L split for neodymium isotopic analysis following Shabani et al. (1992). Samples were pH-adjusted to pH ~3.5, then pumped through 300 µl of HDEHP in a C18 cartridge to capture REEs. Rare earth elements were eluted from the cartridge using 6M HCl, then Nd was isolated using sequential chromatographic columns: AG50-X8 (BioRad) and Ln-Spec (Eichrom). Neodymium isotopic measurements were made at Lamont-Doherty Earth Observatory (Palisades, NY) using a Thermo Neptune multicollector ICP-MS.

For REE concentrations we removed an aliquot after pH-adjustment of each sample. Sample methodology is described in Behrens et al. (2006), as Lab #3. We preconcentrated 20 ml of sample offline using a SeaFast PICO system (ESI), then analysed the resulting solution at Oregon State University (Corvallis, OR) using a Thermo X-Series II ICP-MS.

Problem Report: Cerium measurements yielded questionable data during a couple of run days, these data are indicated using IODE quality flag 3– Questionable Data. Sample gaps in REE concentrations are due to analytical error during pre-concentration, sample gaps in Nd isotope data are due to insufficient quantity of Nd to make a measurement.


Related Datasets

IsRelatedTo

Dataset: GP16 Dissolved Nd Isotopes and REEs - LDEO
Relationship Description: This collaborative project was investigated by Nd isotope groups at LDEO and OSU. The two groups analyzed samples at alternate stations.
Wu, Y., Basak, C., Pena , L. D., Bolge, L. L., Goldstein, S. L. (2023) Dissolved neodymium (Nd) isotopes and concentrations of rare-earth elements (REEs) reported by LDEO in seawater samples collected during the GEOTRACES GP16 East Pacific Zonal Transect cruise (TN303) on R/V Thomas G. Thompson from October to December 2013. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2023-12-19 doi:10.26008/1912/bco-dmo.915447.1

Related Publications

Methods

Behrens, M. K., Muratli, J., Pradoux, C., Wu, Y., Böning, P., Brumsack, H.-J., … Pahnke, K. (2016). Rapid and precise analysis of rare earth elements in small volumes of seawater - Method and intercomparison. Marine Chemistry, 186, 110–120. doi:10.1016/j.marchem.2016.08.006
Methods

Shabani, M. B., Akagi, T., & Masuda, A. (1992). Preconcentration of trace rare-earth elements in seawater by complexation with bis(2-ethylhexyl) hydrogen phosphate and 2-ethylhexyl dihydrogen phosphate adsorbed on a C18 cartridge and determination by inductively coupled plasma mass spectrometry. Analytical Chemistry, 64(7), 737–743. doi:10.1021/ac00031a008
Methods

Tanaka, T., Togashi, S., Kamioka, H., Amakawa, H., Kagami, H., Hamamoto, T., … Dragusanu, C. (2000). JNdi-1: a neodymium isotopic reference in consistency with LaJolla neodymium. Chemical Geology, 168(3-4), 279–281. doi:10.1016/s0009-2541(00)00198-4