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OAS accession Detail for 0278285
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| accessions_id: | 0278285 | archive |
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| Title: | Porewater NO3+NO2 and Ammonia from samples collected by pushcore from Guaymas Basin hydrothermal sediments on R/V Atlantis cruise AT37-06 in the Guaymas Basin in December 2016 (NCEI Accession 0278285) |
| Abstract: | This dataset contains chemical data collected on R/V Atlantis during cruise AT37-06 from 2016-12-09 to 2016-12-27. These data include Ammonium. The instruments used to collect these data include Alvin tube core and Nutrient Autoanalyzer. These data were collected by Andreas P. Teske of University of North Carolina at Chapel Hill as part of the "Collaborative Research: Microbial Carbon cycling and its interactions with Sulfur and Nitrogen transformations in Guaymas Basin hydrothermal sediments (Guaymas Basin Interactions)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-08-24. The following is the text of the dataset description provided by BCO-DMO: Porewater NO3+NO2 and Ammonia from samples collected by pushcore from Guaymas Basin hydrothermal sediments on cruise AT37-06 Dataset Description: Porewater NO3+NO2 and Ammonia from samples collected by pushcore from Guaymas Basin hydrothermal sediments on cruise AT37-06 in December 2016. |
| Date received: | 20200824 |
| Start date: | 20161209 |
| End date: | 20161227 |
| Seanames: | |
| West boundary: | -111 |
| East boundary: | -111 |
| North boundary: | 27 |
| South boundary: | 27 |
| Observation types: | chemical |
| Instrument types: | nutrient autoanalyzer |
| Datatypes: | AMMONIUM (NH4) |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of North Carolina - Chapel Hill |
| Contributing projects: | |
| Platforms: | Atlantis (33AT) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Sampling and Analytical Methodology: Freshly collected sediment cores were sliced on the ship into 3 cm layers; porewater was obtained by gently centrifuging freshly collected sediment in 50 ml conical Falcon tubes for ca. 5 to 10 minutes until the sediment had settled; one Falcon tube produced ca. 8 to 10 ml of porewater. For porewater sulfate measurements, 1 ml subsamples of the overlying porewater were drawn into syringes and injected through 0.45 μm filters into screw cap Eppendorf vials, each acidified with 50 µl of 6N HCl, and then gently bubbled with nitrogen for 4 min to remove sulfide; the samples were then stored at 4ºC before shipping and analysis Geochemical Analyses: Porewaters from Guaymas Basin sediments were analyzed for Nitrate+Nitrite and ammonia concentrations colorimetrically using a Flow Solutions IV segmented flow Auto Analyzer from O.I Analytical, College Station, TX. The samples were preserved in H2SO4 and were neutralized with NaOH before analysis. Nitrate+Nitrite was determined using the cadmium reduction method and ammonia was determined using the phenate method. Both nutrients were diluted to get their concentrations within the linear range of the auto analyzer. Quality control standards from certified stock standard purchased from Environmental Research Associates, were analyzed every 15-20 samples. Analysis Notes: Samples with a NH4 or N+N concentration of greater than 20um were repated at a higher dilution. Samples were run for NH4 first at a dilution of 40 X (0.1 ml sample to 3.9 ml DDI water). All NH4 samples were repeated by making a 10x dilution from the 40x dilutions resulting in a 400x dilution. NH4 and N+N were analyzed separately. A NaOH solution was made to adjust the pH of the sample to between 5 and 9 upon sample dilution. The N+N samples were run at a 2x dilution (0.75 ml sample to 0.75 ml NaOH solution). Repeated 4869-21 (0-3) at 140x dilution; value confirmed. Repated all remaining N+N samples greater than 20um at 20x dilution. EPA Method: NO2+NO3 = EPA 353.4; NH4 = EPA 350.1. Data Processing: The porewater data of Guaymas Basin sand Sonora Margin piston cores were tabulated in Excel sheets. Quality Control: Note that Sample_IDs "QCS" are internal quality control standards (10 uM) and Sample_IDs "ICV" are external quality control standards. |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-16 04:22:21+00 |
| Editdate: | 2023-05-16 04:22:53+00 |