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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: 2020-12-10DOI registered: 2021-11-12

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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).
Keyword(s):
Biomarker; Compound-specific Isotopes; n-alkanes; river sediment
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
PLV_07092017  * Latitude: -25.653461 * Longitude: -60.128814 * Date/Time Start: 2017-09-07T00:00:00 * Date/Time End: 2017-10-29T00:00:00 * Location: Puerto lavalle * Method/Device: Bucket, plastic (WB) * Comment: River km 865
PLV_09072017  * Latitude: -25.653461 * Longitude: -60.128814 * Date/Time Start: 2017-07-09T00:00:00 * Date/Time End: 2017-07-26T00:00:00 * Location: Puerto lavalle * Method/Device: Bucket, plastic (WB) * Comment: River km 865
Comment:
#999: not measured
#9999: not detected
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEventRepasch, Marisa N
Latitude of eventLatitudeRepasch, Marisa N
Longitude of eventLongitudeRepasch, Marisa N
Date/Time of eventDate/TimeRepasch, Marisa N
Date/Time of event 2Date/Time 2Repasch, Marisa N
n-Alkanes, (C31+C33)/(C27+C29) ratio(C31+C33)/(C27+C29)Repasch, Marisa N
n-Alkanes, total massn-Alkanes totµgRepasch, Marisa NAccelerated Solvent Extraction (Dionex ASE)
Fraction modern carbon, organic, errorF14Corg e±Repasch, Marisa N
Fraction modern carbon, organicF14CorgRepasch, Marisa NFor combined samples, values were weighted by sample mass
10 n-Alkane C20, per unit sediment massC20/sedµg/gRepasch, Marisa NGas 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 massC18/sedµg/gRepasch, Marisa NGas 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 massC17/sedµg/gRepasch, Marisa NGas 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 massC16/sedµg/gRepasch, Marisa NGas 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 massC24/sedµg/gRepasch, Marisa NGas 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 massC22/sedµg/gRepasch, Marisa NGas 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 massC35/sedµg/gRepasch, Marisa NGas 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 massC34/sedµg/gRepasch, Marisa NGas 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 massC32/sedµg/gRepasch, Marisa NGas 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 massC30/sedµg/gRepasch, Marisa NGas 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 massC28/sedµg/gRepasch, Marisa NGas 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 massC26/sedµg/gRepasch, Marisa NGas 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 massC19/sedµg/gRepasch, Marisa NGas 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 massC21/sedµg/gRepasch, Marisa NGas 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 massC33/sedµg/gRepasch, Marisa NGas chromatography (Agilent GC 7890-A) with flame ionization detection (FID) coupled to a single quadrupole mass spectrometer (MS 5975-C)
25 n-Alkane C29, δDC29 δD‰ SMOWRepasch, Marisa NGas 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 carbonn-A sum/TOCµg/gRepasch, Marisa N
27 n-Alkane C31, per unit sediment massC31/sedµg/gRepasch, Marisa NGas 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 massC29/sedµg/gRepasch, Marisa NGas 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 massC27/sedµg/gRepasch, Marisa NGas 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 massC25/sedµg/gRepasch, Marisa NGas 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 massC23/sedµg/gRepasch, Marisa NGas 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 deviationC33 δD std dev±Repasch, Marisa NGas 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, δDC33 δD‰ SMOWRepasch, Marisa NGas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer
34 River dischargeQm3/sRepasch, Marisa N
35 n-Alkane C33, δ13C, standard deviationC33 δ13C std dev±Repasch, Marisa NGas 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 deviationC31 δD std dev±Repasch, Marisa NGas 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, δDC31 δD‰ SMOWRepasch, Marisa NGas chromatography - Isotope ratio mass spectrometer (GC-IRMS) (ThermoFisher Scientific Trace GC 1310) coupled to a Delta-V isotope ratio mass spectrometer
38 Average chain lengthACLRepasch, Marisa NC21-C35
39 n-Alkane C31, δ13C, standard deviationC31 δ13C std dev±Repasch, Marisa NGas 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 deviationC27 δD std dev±Repasch, Marisa NGas 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, δDC27 δD‰ SMOWRepasch, Marisa NGas 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 deviationC27 δ13C std dev±Repasch, Marisa NGas 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 deviationC29 δD std dev±Repasch, Marisa NGas 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 deviationC29 δ13C std dev±Repasch, Marisa NGas 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, δ13CC33 δ13C‰ PDBRepasch, Marisa NGas 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, δ13CC31 δ13C‰ PDBRepasch, Marisa NGas 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, δ13CC29 δ13C‰ PDBRepasch, Marisa NGas 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, δ13CC27 δ13C‰ PDBRepasch, Marisa NGas chromatography-combustion-isotope ratio mass spectrometry (GC-C-IRMS) with helium as a carrier gas (Agilent 7890N, ThermoFisher Delta V Plus)
49 DistanceDistancekmRepasch, Marisa NAlong 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 IDSample IDRepasch, Marisa N
51 Sampling dateSampling dateRepasch, Marisa NSamples with low mass were combined to create a time-integrated sample
52 Median, grain sizeD50µmRepasch, Marisa N
53 Carbon Preference IndexCPIRepasch, Marisa NC21-C35
54 n-alkanes, total, per unit sediment massn-alkanes tot/sedµg/gRepasch, Marisa N
55 Sample massSamp mgRepasch, Marisa NSediment
56 Size fraction < 0.030 mm<30 µm%Repasch, Marisa N
57 δ13C, organic carbonδ13C Corg‰ PDBRepasch, Marisa NFor combined samples, values were weighted by sample mass
58 Carbon, organic, totalTOC%Repasch, Marisa N
Size:
423 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Event

Latitude

Longitude

Date/Time

Date/Time 2

(C31+C33)/(C27+C29)

n-Alkanes tot [µg]

F14Corg e [±]

F14Corg
10 
C20/sed [µg/g]
11 
C18/sed [µg/g]
12 
C17/sed [µg/g]
13 
C16/sed [µg/g]
14 
C24/sed [µg/g]
15 
C22/sed [µg/g]
16 
C35/sed [µg/g]
17 
C34/sed [µg/g]
18 
C32/sed [µg/g]
19 
C30/sed [µg/g]
20 
C28/sed [µg/g]
21 
C26/sed [µg/g]
22 
C19/sed [µg/g]
23 
C21/sed [µg/g]
24 
C33/sed [µg/g]
25 
C29 δD [‰ SMOW]
26 
n-A sum/TOC [µg/g]
27 
C31/sed [µg/g]
28 
C29/sed [µg/g]
29 
C27/sed [µg/g]
30 
C25/sed [µg/g]
31 
C23/sed [µg/g]
32 
C33 δD std dev [±]
33 
C33 δD [‰ SMOW]
34 
Q [m3/s]
35 
C33 δ13C std dev [±]
36 
C31 δD std dev [±]
37 
C31 δD [‰ SMOW]
38 
ACL
39 
C31 δ13C std dev [±]
40 
C27 δD std dev [±]
41 
C27 δD [‰ SMOW]
42 
C27 δ13C std dev [±]
43 
C29 δD std dev [±]
44 
C29 δ13C std dev [±]
45 
C33 δ13C [‰ PDB]
46 
C31 δ13C [‰ PDB]
47 
C29 δ13C [‰ PDB]
48 
C27 δ13C [‰ PDB]
49 
Distance [km]
50 
Sample ID
51 
Sampling date
52 
D50 [µm]
53 
CPI
54 
n-alkanes tot/sed [µg/g]
55 
Samp m [g]
56 
<30 µm [%]
57 
δ13C Corg [‰ PDB]
58 
TOC [%]
PLV_01062017 -25.6535-60.12882017-06-012017-06-091.4611.830.940.840.030.03#9999.00#9999.000.010.030.03#9999.000.020.030.030.03#9999.000.030.06-129.42264.10.190.120.060.040.051.20-120.193140.230.80-141.8029.890.091.36-118.900.200.920.12-33.46-34.17-34.92-32.60865PLV_01062017June 1 + June 914.664.460.7915.0471-26.400.30
PLV_12062017 -25.6535-60.12882017-06-122017-06-281.3716.030.950.770.050.04#9999.00#9999.00#9999.000.060.03#9999.000.040.050.050.030.010.050.10-134.75341.90.240.150.090.050.070.94-121.732520.259.49-128.3929.820.182.71-127.590.346.070.36-33.81-34.65-34.43-31.99865PLV_12062017June 12, 22, 2812.273.961.1014.5472-26.510.32
PLV_09072017 -25.6535-60.12882017-07-092017-07-261.448.981.870.730.05#9999.00#9999.00#9999.000.020.040.03#9999.000.040.050.030.03#9999.000.040.10-126.42266.80.230.150.080.040.03#999.00#999.001500.260.30-139.7030.050.043.72-123.280.180.240.07-33.70-34.74-35.27-32.14865PLV_09072017July 9, 12, 21, 2616.394.370.949.5666-26.430.35
PLV_07092017 -25.6535-60.12882017-09-072017-10-291.732.002.100.670.03#9999.00#9999.00#9999.000.030.03#9999.00#9999.000.050.030.010.02#9999.00#9999.000.05-109.27117.00.110.060.030.02#9999.00#999.00#999.00660.164.61-124.0830.100.17#999.00#999.000.112.040.20-33.52-34.31-35.04-32.38865PLV_07092017Sept 7, 14, 22, 29, Oct 09, 19, 299.072.470.474.2387-26.340.40
PLV_11122017 -25.6535-60.12882017-12-111.3216.980.890.740.01#9999.00#9999.00#9999.000.010.030.02#9999.000.020.020.020.02#9999.000.020.08-134.71273.10.170.130.060.040.033.90-127.481120.130.88-144.2029.860.120.74-131.680.141.640.12-37.04-37.25-36.83-33.98865PLV_11122017single sample12.546.990.6924.7377-26.180.25
PLV_12012018 -25.6535-60.12882018-01-121.3728.520.910.800.020.01#9999.00#9999.00#9999.000.020.040.010.030.020.020.030.010.020.10-137.70303.20.230.160.090.040.038.65-129.553860.282.15-149.5230.040.101.34-140.120.181.600.26-33.19-33.42-33.98-31.15865PLV_12012018single sample14.616.090.8932.0367-26.660.29
PLV_21022018 -25.6535-60.12882018-02-211.3736.670.930.800.020.01#9999.00#9999.00#9999.000.020.030.020.030.030.030.02#9999.000.020.10-137.22278.90.270.190.080.030.021.71-130.5211620.260.13-146.4630.170.181.37-136.260.211.350.08-35.02-35.00-35.11-32.34865PLV_21022018single sample13.145.760.9239.6671-26.840.33
PLV_16032018 -25.6535-60.12882018-03-161.456.43#999.00#999.000.020.100.050.05#9999.00#9999.000.02#9999.000.020.030.04#9999.000.030.030.10-139.19339.70.250.170.080.030.02#999.00#999.0012900.060.02-151.4630.170.222.35-139.920.170.580.19-33.45-33.69-33.28-30.77865PLV_16032018single sample#999.007.241.056.10#999.000.31