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de Stigter, Henko (2019): Radionuclide data (total 210Pb) measured on sediment multi cores during SONNE cruise SO242/1 at the DISCOL area, Peru Basin. PANGAEA, https://doi.org/10.1594/PANGAEA.905442

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Abstract:
Sediment profiles of 210Pb and 226Ra, radio-isotopes from the 234U decay series with half-lives of respectively 22.3 and 1600 year, were measured in multicores collected from the DISCOL Experimental Area in the Peru Basin during SO242-1, for determining biological mixing rates integrated over a ~100 year time-scale. Total 210Pb and 226Ra activity were determined directly by gamma-spectrometry, whilst total 210Pb was also measured indirectly by alpha-spectrometry via its granddaughter isotope 210Po. Activities of anthropogenic 137Cs proved to be generally below detection level. Radionuclide activities are reported in the data base as mBq g-1 dry sediment.
For alpha spectrometry measurement of 210Po, 0.5 g of freeze-dried and homogenised sediment contained in a plastic reaction tube was spiked with 1 ml of a standard solution of 209Po in 2M HCl, and then leached for 6 h in 10 ml of concentrated HCl heated to 85ºC. After diluting the fluid with 45 ml of demineralised water and adding 5 ml of an aqueous solution of ascorbic acid (40 g L-1), natural 210Po and added 209Po were collected from the fluid by spontaneous electrochemical deposition on silver plates, which were suspended in the fluid for at least 16 h while the fluid was heated to 70ºC. The Po isotopes collected on the silver plates were then measured by alpha-spectrometry using Canberra Passivated Implanted Planar Silicon detectors, with a count time of 1 day sufficient to reduce counting error to < 3%. 210Pb activity was calculated from 210Po, assuming secular equilibrium and correcting for the time elapsed since collection of the samples.
Related to:
Haffert, Laura; Haeckel, Matthias; de Stigter, Henko; Janssen, Felix (2020): Assessing the temporal scale of deep-sea mining impacts on sediment biogeochemistry. Biogeosciences, 17(10), 2767-2789, https://doi.org/10.5194/bg-17-2767-2020
Coverage:
Median Latitude: -7.079800 * Median Longitude: -88.457035 * South-bound Latitude: -7.125400 * West-bound Longitude: -88.526350 * North-bound Latitude: -7.056217 * East-bound Longitude: -88.413767
Date/Time Start: 2015-08-02T21:27:28 * Date/Time End: 2015-08-22T04:21:40
Minimum DEPTH, sediment/rock: 0.0025 m * Maximum DEPTH, sediment/rock: 0.3500 m
Event(s):
SO242/1_34-1 (SO242/1_34-1_MUC 6) * Latitude: -7.125400 * Longitude: -88.450517 * Date/Time: 2015-08-02T21:27:28 * Elevation: -4161.7 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
SO242/1_56-1 (SO242/1_56-1_MUC 12) * Latitude: -7.073567 * Longitude: -88.462667 * Date/Time: 2015-08-06T15:32:28 * Elevation: -4149.0 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
SO242/1_61-1 (SO242/1_61-1_MUC 13) * Latitude: -7.072967 * Longitude: -88.463017 * Date/Time: 2015-08-07T01:03:01 * Elevation: -4148.0 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventde Stigter, Henko
2Optional event labelEvent 2de Stigter, Henko
3Date/Time of eventDate/Timede Stigter, Henko
4Latitude of eventLatitudede Stigter, Henko
5Longitude of eventLongitudede Stigter, Henko
6Elevation of eventElevationmde Stigter, Henko
7Depth, top/minDepth topmde Stigter, Henko
8Depth, bottom/maxDepth botmde Stigter, Henko
9DEPTH, sediment/rockDepth sedmde Stigter, HenkoGeocode
10Lead-210210PbBq/kgde Stigter, Henkototal
11Lead-210, error210Pb e±de Stigter, Henko1s
Size:
644 data points

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