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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_108-1 (SO242/1_108-1_MUC 26) * Latitude: -7.074717 * Longitude: -88.448650 * Date/Time: 2015-08-18T00:08:10 * Elevation: -4169.1 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
SO242/1_119-1 (SO242/1_119-1_MUC 31) * Latitude: -7.100550 * Longitude: -88.413767 * Date/Time: 2015-08-20T08:37:35 * Elevation: -4204.1 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: MultiCorer (MUC) * Comment: device position
SO242/1_129-1 (SO242/1_129-1_BC 26) * Latitude: -7.056217 * Longitude: -88.433767 * Date/Time: 2015-08-22T04:21:40 * Elevation: -4144.3 m * Campaign: SO242/1 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Box corer (BC) * Comment: device position
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventde Stigter, Henko
2Depth, top/minDepth topmde Stigter, Henko
3Depth, bottom/maxDepth botmde Stigter, Henko
4DEPTH, sediment/rockDepthmde Stigter, HenkoGeocode
5Lead 210210PbBq/kgde Stigter, Henkototal
6Lead 210, error210Pb e±de Stigter, Henko1s
Size:
644 data points

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