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OAS accession Detail for 0277713
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| accessions_id: | 0277713 | archive |
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| Title: | Dissolved thorium-230 and thorium-232 from R/V Point Sur cruise PS1718 at the site of the former Deepwater Horizon in April 2017 (NCEI Accession 0277713) |
| Abstract: | This dataset contains chemical and physical data collected on R/V Point Sur during cruise PS1718 in the Gulf of Mexico on 2017-04-01. These data include depth and trace metal concentration. The instruments used to collect these data include Inductively Coupled Plasma Mass Spectrometer and Niskin bottle. These data were collected by Christopher T. Hayes of University of Southern Mississippi as part of the "Collaborative Research: U.S. GEOTRACES Pacific Meridional Transect: Thorium-232, Thorium-231 and Protactinium-231 as tracers of trace element supply and removal (PMT Thorium Isotopes)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-07-31. The following is the text of the dataset description provided by BCO-DMO: Dissolved thorium-230 and thorium-232 from the site of the former Deepwater Horizon Dataset Description: Dissolved thorium-230 and thorium-232 from the site of the former Deepwater Horizon on R/V Point Sur cruise PS1718 in April 2017. Note: These data were collected through auxiliary activities in coordination with the GEOTRACES PMT project funded by NSF OCE-1737023. |
| Date received: | 20200731 |
| Start date: | 20170401 |
| End date: | 20170401 |
| Seanames: | Gulf of Mexico |
| West boundary: | -88.451 |
| East boundary: | -88.329 |
| North boundary: | 28.732 |
| South boundary: | 28.723 |
| Observation types: | chemical, physical |
| Instrument types: | bottle, mass spectrometer |
| Datatypes: | DEPTH - OBSERVATION, TRACE METALS |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | The University of Southern Mississippi |
| Contributing projects: | |
| Platforms: | POINT SUR (32P0) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Sampling occurred according the GEOTRACES cookbook recommendations for radionuclides ( https://www.geotraces.org/methods-cookbook/ ). Water was filtered from standard Niskin bottles through a 0.45 micron Acropak capsule filter and teflon line tygon tubing. Water was acidified to 0.024 M HCl using optima acid once the samples were returned to the lab about 2-3 days after collection. Water samples were left to sit acidified for at least 3 months prior to analysis to avoid adsorption loss. Analysis of the thorium isotopes was by isotope dilution inductively-coupled plasma mass spectrometry as described by Hayes et al. (2017). Briefly, thorium-229 was added to acidified 4-liter water samples and allowed to equilibrate overnight. About 10 mg of Fe from an iron chloride solution was added and pH was raised with optima ammonium hydroxide to 8-9 and iron (oxy)hydroxide precipitate was allowed to settle for 2 days. Overlaying seawater was decanted and the iron precipitate was isolated using a series of centrifugation steps. The precipitate was digested with HNO3, HF and H2O2, then thorium was purified using anion exchange resin AG1-X8. Final solutions were dried down and taken up in 2% HNO3 for analysis on ICP-MS. |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-04-20 04:20:03+00 |
| Editdate: | 2023-04-20 04:20:40+00 |