Repasch, Marisa N; Vieth-Hillebrand, Andrea; Sachse, Dirk; Scheingross, Joel S; Hovius, Niels (2020): Bulk organic carbon and n-alkane composition data for time-series samples from the Rio Bermejo (Argentina) at river km 865 collected in 2017 - 2018 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.925620
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Published: 2020-12-10 • DOI registered: 2021-11-12
Abstract:
Additionally, we employed a local resident to collect surface water suspended sediment samples at river km 865 throughout the 2017-2018 water year. These samples were collected in a bucket, the sediment was allowed to settle, and then the water was decanted off the top. Recovered sediment was stored in sterile Whirlpak bags, and then dried in an oven at 40°C.
We homogenized and disaggregated the dry sediment using a mortar and pestle, and removed coarse plant material >1 mm. For each sample, we weighed an aliquot of sediment and loaded the material into aluminum cells for lipid extraction. Total lipid extracts (TLE) were recovered using an accelerated solvent extraction system (Dionex ASE) with 9:1 v/v dichloromethane: methanol. We added exactly 10 µg of internal standard (5-a-Androstane) to the TLE for unknown compound quantification. We then separated the TLE into three fractions using silica gel column chromatography with hexane (alkanes), 1:1 v/v hexane: dichloromethane (ketones), and 1:1 v/v dichloromethane: methanol (alcohols + acids) (Rach et al., 2020; doi:10.1016/j.orggeochem.2020.103995). Unsaturated compounds were removed from the alkane fraction using AgNO3-silica gel column chromatography with n-hexane (saturated n-alkanes) and DCM (unsaturated n-alkanes).
n-alkanes were identified and quantified using an Agilent gas chromatograph (GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C). We quantified n-alkane concentrations relative to the peak response of the internal standard, and then normalized the abundance to the sediment mass. We measured n-alkane d13C via GC-C-IRMS (gas chromatography/combustion/isotope-ratio mass spectrometry) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus). All compounds were measured in triplicate with a standard deviation of =0.5‰. Measurement quality was checked regularly by measuring n-alkane standards (nC15, nC20, nC25) with known isotopic composition (provided by Campro Scientific, Germany). d13C values were normalized to the Vienna Pee Dee Belemnite (VPDB) standard. We measured n-alkane d2H via GC-IRMS using a ThermoFisher Scientific Trace GC 1310 coupled to a Delta-V isotope ratio mass spectrometer. All d2H measurements were made in duplicate, and measurement quality was checked with d2H values were normalized to the Vienna Standard Mean Ocean Water (VSMOW) standard using an n-alkane standard mix with known d2H values (nC16 - nC30, from A. Schimmelman/Indiana University).
Related to:
Repasch, Marisa N; Scheingross, Joel S; Hovius, Niels; Lupker, Maarten; Wittmann, Hella; Haghipour, Negar; Gröcke, Darren R; Orfeo, Oscar; Eglinton, Timothy Ian; Sachse, Dirk (2021): Fluvial organic carbon cycling regulated by sediment transit time and mineral protection. Nature Geoscience, 14(11), 842-848, https://doi.org/10.1038/s41561-021-00845-7
Coverage:
Latitude: -25.653461 * Longitude: -60.128814
Date/Time Start: 2017-06-01T00:00:00 * Date/Time End: 2018-03-16T00:00:00
Event(s):
PLV_01062017 * Latitude: -25.653461 * Longitude: -60.128814 * Date/Time Start: 2017-06-01T00:00:00 * Date/Time End: 2017-06-09T00:00:00 * Location: Puerto lavalle * Method/Device: Bucket, plastic (WB) * Comment: River km 865
Comment:
#999: not measured
#9999: not detected
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Repasch, Marisa N | |||
| 2 | Latitude of event | Latitude | Repasch, Marisa N | |||
| 3 | Longitude of event | Longitude | Repasch, Marisa N | |||
| 4 | Date/Time of event | Date/Time | Repasch, Marisa N | |||
| 5 | Date/Time of event 2 | Date/Time 2 | Repasch, Marisa N | |||
| 6 | n-Alkanes, (C31+C33)/(C27+C29) ratio | (C31+C33)/(C27+C29) | Repasch, Marisa N | |||
| 7 | n-Alkanes, total mass | n-Alkanes tot | µg | Repasch, Marisa N | Accelerated Solvent Extraction (Dionex ASE) | |
| 8 | Fraction modern carbon, organic, error | F14Corg e | ± | Repasch, Marisa N | ||
| 9 | Fraction modern carbon, organic | F14Corg | Repasch, Marisa N | For combined samples, values were weighted by sample mass | ||
| 10 | n-Alkane C20, per unit sediment mass | C20/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 11 | n-Alkane C18, per unit sediment mass | C18/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 12 | n-Alkane C17, per unit sediment mass | C17/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 13 | n-Alkane C16, per unit sediment mass | C16/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 14 | n-Alkane C24, per unit sediment mass | C24/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 15 | n-Alkane C22, per unit sediment mass | C22/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 16 | n-Alkane C35, per unit sediment mass | C35/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 17 | n-Alkane C34, per unit sediment mass | C34/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 18 | n-Alkane C32, per unit sediment mass | C32/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 19 | n-Alkane C30, per unit sediment mass | C30/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 20 | n-Alkane C28, per unit sediment mass | C28/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 21 | n-Alkane C26, per unit sediment mass | C26/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 22 | n-Alkane C19, per unit sediment mass | C19/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 23 | n-Alkane C21, per unit sediment mass | C21/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 24 | n-Alkane C33, per unit sediment mass | C33/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 25 | n-Alkane C29, δD | C29 δD | ‰ SMOW | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 26 | n-Alkanes, sum, per unit mass total organic carbon | n-A sum/TOC | µg/g | Repasch, Marisa N | ||
| 27 | n-Alkane C31, per unit sediment mass | C31/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 28 | n-Alkane C29, per unit sediment mass | C29/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 29 | n-Alkane C27, per unit sediment mass | C27/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 30 | n-Alkane C25, per unit sediment mass | C25/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 31 | n-Alkane C23, per unit sediment mass | C23/sed | µg/g | Repasch, Marisa N | Gas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C) | |
| 32 | n-Alkane C33, δD, standard deviation | C33 δD std dev | ± | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 33 | n-Alkane C33, δD | C33 δD | ‰ SMOW | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 34 | River discharge | Q | m3/s | Repasch, Marisa N | ||
| 35 | n-Alkane C33, δ13C, standard deviation | C33 δ13C std dev | ± | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 36 | n-Alkane C31, δD, standard deviation | C31 δD std dev | ± | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 37 | n-Alkane C31, δD | C31 δD | ‰ SMOW | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 38 | Average chain length | ACL | Repasch, Marisa N | C21-C35 | ||
| 39 | n-Alkane C31, δ13C, standard deviation | C31 δ13C std dev | ± | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 40 | n-Alkane C27, δD, standard deviation | C27 δD std dev | ± | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 41 | n-Alkane C27, δD | C27 δD | ‰ SMOW | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 42 | n-Alkane C27, δ13C, standard deviation | C27 δ13C std dev | ± | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 43 | n-Alkane C29, δD, standard deviation | C29 δD std dev | ± | Repasch, Marisa N | Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer | |
| 44 | n-Alkane C29, δ13C, standard deviation | C29 δ13C std dev | ± | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 45 | n-Alkane C33, δ13C | C33 δ13C | ‰ PDB | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 46 | n-Alkane C31, δ13C | C31 δ13C | ‰ PDB | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 47 | n-Alkane C29, δ13C | C29 δ13C | ‰ PDB | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 48 | n-Alkane C27, δ13C | C27 δ13C | ‰ PDB | Repasch, Marisa N | Gas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus) | |
| 49 | Distance | Distance | km | Repasch, Marisa N | Along channel, measured downstream from the Rio Bermejo-Rio San Francisco confluence; 0: Rio San Francisco, -: indicates tributary upstream of the mainstem Rio Bermejo | |
| 50 | Sample ID | Sample ID | Repasch, Marisa N | |||
| 51 | Sampling date | Sampling date | Repasch, Marisa N | Samples with low mass were combined to create a time-integrated sample | ||
| 52 | Median, grain size | D50 | µm | Repasch, Marisa N | ||
| 53 | Carbon Preference Index | CPI | Repasch, Marisa N | C21-C35 | ||
| 54 | n-alkanes, total, per unit sediment mass | n-alkanes tot/sed | µg/g | Repasch, Marisa N | ||
| 55 | Sample mass | Samp m | g | Repasch, Marisa N | Sediment | |
| 56 | Size fraction < 0.030 mm | <30 µm | % | Repasch, Marisa N | ||
| 57 | δ13C, organic carbon | δ13C Corg | ‰ PDB | Repasch, Marisa N | For combined samples, values were weighted by sample mass | |
| 58 | Carbon, organic, total | TOC | % | Repasch, Marisa N |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
423 data points