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OAS accession Detail for 0278247
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| accessions_id: | 0278247 | archive |
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| Title: | Molybdate reactive phosphorus concentrations in NMR pretreatment extracts from sediment samples collected during R/V JOIDES Resolution cruise JRES-336 (IODP336, North Pond) to the western flank of the mid-Atlantic Ridge in November of 2011 (NCEI Accession 0278247) |
| Abstract: | This dataset contains chemical data collected on R/V JOIDES Resolution during cruise JRES-336 from 2011-11-01 to 2016-08-01. These data include reactive phosphorus (PO4). The instruments used to collect these data include Flow Injection Analyzer. These data were collected by Adina Paytan and Dr Delphine Defforey of University of California-Santa Cruz as part of the "Potential phosphorus uptake mechanisms of the deep sedimentary biosphere (Deep sea sediments)" project and "Center for Dark Energy Biosphere Investigations (C-DEBI)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-06-30. The following is the text of the dataset description provided by BCO-DMO: Dataset Description: Molybdate reactive phosphorus concentrations in nuclear magnetic resonance (NMR) pretreatment extracts from sediment samples collected during R/V JOIDES Resolution cruise JRES-336 (IODP336, North Pond) to the western flank of the mid-Atlantic Ridge in November of 2011. Samples were analyzed in 2016. These data were published in Defforey et al. (2016). See the related-resource page https://www.bco-dmo.org/project/664073 for other datasets related to this publication. Additional award information: * NSF C-DEBI subaward # 156246 to Adina Paytan * NSF C-DEBI subaward # 157598 to Delphine Defforey |
| Date received: | 20200630 |
| Start date: | 20111101 |
| End date: | 20160801 |
| Seanames: | |
| West boundary: | -46.08125 |
| East boundary: | -46.08125 |
| North boundary: | 22.75589 |
| South boundary: | 22.75589 |
| Observation types: | chemical |
| Instrument types: | flow injection analyzer |
| Datatypes: | phosphate |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of California - Santa Cruz |
| Contributing projects: | |
| Platforms: | JOIDES Resolution (54JR) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Location: North Atlantic, western flank of the mid-Atlantic Ridge 22.75589 N 46.08125 W Methodology: Prior to the extraction, we freeze-dried, ground and sieved sediment samples to less than 125 μm (Ruttenberg 1992). For a given sample, we weighed four sample replicates (2 g) and placed each in 250 mL HDPE bottles. Sodium dithionite (F.W. 147.12 g/mol; 7.4 g) was added to each sample split, followed by 200 mL of citrate-bicarbonate solution (pH 7.6). This step produces effervescence, so the solution should be added slowly to the sample. We shook samples for 8 h and then centrifuged them at 3,700 rpm for 15 min. We filtered the supernatants with a 0.4 μm polycarbonate filter. We took 20 mL aliquots from the filtrate for each sample split for MRP and total P analyses, and kept them refrigerated until analysis within 24 h. We added 200 mL of ultrapure water to the solid residue for each sample split as a wash step after the above reductive step, shook samples for 2 h, and then centrifuged them at 3,700 rpm for 15 min. We filtered the supernatants with 0.4 μm polycarbonate filters and set aside 20 mL of filtrate from each sample split for MRP and total P analyses. We then extracted the solid sample residues in 200 mL of sodium acetate buffer (pH 4.0) for 6 h. At the end of this extraction step, we centrifuged the bottles at 3,700 rpm for 15 min, filtered the supernatants with 0.4 μm polycarbonate filters and took a 20 mL aliquot of filtrate from each sample split for MRP and total P analyses. We added 200 mL of ultrapure water to the solid residue for each sample split as a wash step, shook samples for 2 h, and then centrifuged them at 3,700 rpm for 15 min. We filtered the supernatants with 0.4 μm polycarbonate filters and set aside 20 mL of filtrate from each sample split for MRP and total P analyses. We repeated the water rinse step, and collected aliquots for MRP and total P analyses as in the previous steps. The concentrations of MRP were determined as described below. The MRP concentrations were measured on a QuikChem 8000 automated ion analyzer. Standards were prepared with the same solutions used for the extraction step to minimize matrix effects on P measurements. Sediment extracts and standards (0 – 30 μM PO4) were diluted ten-fold to prevent matrix interference with color development. The detection limit for P on this instrument is 0.2 μM. We derived MUP concentrations by subtracting MRP from total P concentrations, which are included in a different spreadsheet. |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-15 04:33:12+00 |
| Editdate: | 2023-05-15 04:33:34+00 |