http://lod.bco-dmo.org/id/dataset/925670
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2024-04-23
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Chromium (Cr) concentration and isotope data of chelex-100 extraction method from samples collected on R/V New Horizon cruise NH1410 in May-June 2014
2024-04-23
publication
2024-04-23
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2024-06-05
publication
https://doi.org/10.26008/1912/bco-dmo.925670.1
Edward A. Boyle
Massachusetts Institute of Technology
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Boyle, E. A. (2024) Chromium (Cr) concentration and isotope data of chelex-100 extraction method from samples collected on R/V New Horizon cruise NH1410 in May-June 2014. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-04-23 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.925670.1 [access date]
Cr concentration and isotope data of chelex-100 extraction method from NH1410 Dataset Description: Methods and Sampling: <p>In this study, we report chromium (Cr) isotopes for Cr(III), Cr(VI), and total Cr from three stations within the eastern tropical North Pacific (ETNP) oxygen deficient zone (ODZ) (see Figs. 1 and 2 of Huang, et al. 2021). Two of these stations (P1 and P2) were collected on cruises Roger Revelle 1804-5 (April to May 2018) and KM1920 (September 2019). The third (2T) was collected on cruise New Horizon 1410 (May 2014) whose primary data are reported in Moos, et al. (2020). Water samples were collected using Niskin Bottles on a CTD rosette or Niskin-X bottles on a TE clean rosette.</p>
<p>To separate Cr species and analyze their isotopic compositions, we used a Mg(OH)2 coprecipitation method similar to that reported in Janssen, et al. (2020) and Davidson, et al. (2019) with some differences in the details:</p>
<p>(1) A 50Cr–54Cr double spike was added to each sample before collecting Mg(OH)2. The double-spike was allowed to equilibrate with samples for ∼6 hours. Tests of equilibration time between 0.5 and 12 hours show no difference in isotopic values.</p>
<p>(2) No iron coprecipitation was done to separate Cr(III) from the Mg matrix. The Mg(OH)2 pellets were dissolved in HCl, pH-adjusted, and ready for column chromatography as described in Moos and Boyle (2019).</p>
<p>(3) To determine Cr(VI) isotopic composition, we filtered the supernatant after the Mg(OH)2 coprecipitation and acidified it to pH 1.9 with HCl for an extended time afterward.</p>
<p>The Cr(VI) that was left in solution converts to Cr(III) which we then analyze by a second double-spike Mg(OH)2 coprecipitation and column purification. Some Cr(VI) isotopic compositions were calculated using the concentration and isotopic composition of total Cr and Cr(III) by mass balance.</p>
<p>Additionally, we analyzed Cr(III) concentrations and isotope ratios by Cr(III) double-spike isotope dilution either at sea or immediately following thawing of frozen samples. Three samples were processed in both ways and all give the same results. The method for total Cr concentration and isotopic composition is described in detail in Moos and Boyle (2019). All of our samples have a within-run error of 0.02 to 0.19‰ (2 SE) on δ53Cr. The average [Cr] and δ53Cr values of a long-term in-house seawater standard are 3.20 ± 0.12 nmol/kg (SD, n = 20) and 1.02 ± 0.13‰ (2 SD, n = 20), respectively.</p>
<p><strong>Instruments:</strong><br />
All Cr isotope measurements were made on an IsoProbe MC-ICP-MS. A 'peak-jump' mode was applied in the Cr isotope analysis on IsoProbe MC-ICP-MS. The plasma mass spectrometer was tuned on an 100 mM NH4S2O8 solution with 1 µM Cr to minimize polyatomic sulfur interferences (i.e. 32S16O1H+ on mass 49, 34S16O+ on mass 50, and 34S16O1H+ on mass 51) by lowering the signal of mass 49 (polyatomic) relative to mass 52 (Cr). Each sample was bracketed by two SRM-DS mixtures with the same sample Cr to DS ratio and similar signal level (within 10%). The δ53Cr data was calculated by iteration on each isotope correction and instrumental mass fractionation (β) in an Excel spreadsheet (Moos and Boyle, 2019). The [Cr] concentration was calculated by averaging the results from the single isotope dilution formula using corrected 50Cr and 54Cr.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1924050 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1924050
completed
Edward A. Boyle
Massachusetts Institute of Technology
617-253-3388
Chemical Oceanography, Trace Metal Group MIT E25-619, 45 Carleton St
Cambridge
MA
02142
USA
eaboyle@mit.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Cruise
Station
Latitude
Longitude
Depth
Corrected_CrIII
Corrected_d53Cr
Measured_CrVI
Measured_d53CrVI
Calculated_total_Cr
Calculated_total_d53Cr
IsoProbe MC-ICP-MS
Niskin bottles and Niskin-X bottles
theme
None, User defined
Cruise identfier
station
latitude
longitude
depth
Chromium
featureType
BCO-DMO Standard Parameters
Inductively Coupled Plasma Mass Spectrometer
Niskin bottle
instrument
BCO-DMO Standard Instruments
NH1410
service
Deployment Activity
Eastern Tropical North Pacific (ETNP) oxygen minimum zone off Manzanillo, Mexico; sampling transects run southeast-northwest along the Colima coast (~19-24°N, 106-116°W) and northeast-southwest off the coast (~14-18°N, 106-115°W)
place
Locations
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Cr Isotope Oceanography of the Eastern Tropical North Pacific Ocean
https://osprey.bco-dmo.org/project/897439
Cr Isotope Oceanography of the Eastern Tropical North Pacific Ocean
<p><em>NSF Award Abstract:</em><br />
Surface seawater equilibrates with the atmosphere and has high oxygen levels, supporting the sea life within it. When this water is cooled in the winter, it becomes denser and sinks into the depths of the ocean, and begins to lose its oxygen as microbes respire while feeding on sinking organic matter falling from the upper ocean. In some regions, such as the eastern tropical North Pacific Ocean, this process leads to such low oxygen concentrations that oxygen-respiring organisms such as fish cannot survive. There is evidence that these regions are growing larger in recent decades raising concerns over the consequences should these trends continue. Geologists looking at ancient sediments have surmised that some periods in the past have had much larger oxygen-depleted portions of the ocean, so we know the possibility exists. We are working on a new tracer of these oxygen deficient zones, the chromium isotope ratio of seawater. Chromium (Cr) is a trace element found throughout the ocean; in oxygen depleted zones it is reduced from the highly soluble 6+ oxidation state (hexavalent Cr, a toxic pollutant at high concentrations) to the relatively insoluble 3+ state (trivalent Cr) which is removed from the ocean attached to sinking particles. This process favors lighter Cr isotopes hence Cr with 24 protons and 28 neutrons is preferentially transformed compared to Cr with 24 protons and 29 neutrons. This transformation can be used to study the extent and activity of oxygen deficient zones in the modern ocean and in geological ancient oceans. There is very little data for Cr isotopes in these environments, and this project will obtain some of the first data with fieldwork sample collection in the eastern tropical North Pacific Ocean and laboratory measurements using plasma mass spectrometry. This research can contribute to sedimentary geological and geochemical understanding. A female Ph.D. student at Massachusetts Institute of Oceanography will participate in the project that will comprise most of her thesis research.</p>
<p>Chromium (Cr) in the aquatic environment exists in two redox states, Cr(III) and Cr(VI). Cr(VI) is thermodynamically stable and the dominant form observed in the oxic ocean, although a few percent of unstable Cr(III) is also observed. Cr(III) is particle-reactive and is scavenged onto sinking particulate matter, whereas Cr(VI) is relatively unreactive. Both species can be taken up by marine biota, although diatoms take up Cr(III) ~20 times faster. Cr(III) has biochemical functionality (e.g. lipid and protein metabolism), whereas Cr(VI) is a toxin that damages cellular biochemistry. When oxygen is less than about 2 uM, Cr(III) becomes the thermodynamically stable species, but slow reaction kinetics lets microbial activity or environmental reductants such as Fe(II) dominate the conversion. Theory and lab experiments indicate that this redox transformation should be accompanied by a stable isotope ratio shift when partial conversion occurs, with Cr(III) enriched in the lighter isotopes. Of the four Cr stable isotopes, this process is observed using the ratio of the most abundant natural isotopes 53Cr and 52Cr while using an enriched double spike of the scarce 50Cr and 54Cr isotopes to correct for laboratory and instrument mass fractionation. This sensitivity to environmental oxygen has inspired geologists to use Cr isotope ratios as an indicator of past oxygenation conditions on earth. But there is little data on the Cr isotope composition in marine aquatic systems with which to ground-truth the geological inferences. We will illuminate the Cr isotope geochemistry of the marine environment with measurements on the horizontal and vertical distribution of Cr concentrations and Cr isotope ratios for the Cr redox species and particulate matter for samples from the eastern tropical North Pacific oxygen deficient zone. Cr isotope ratios are sensitive to biological uptake and regeneration in the oxic ocean and redox processes in oxygen deficient zones (and the latter's consequent outmixing into adjacent oxic zones). This data will be examined in relationship to standard hydrographic properties and nutrients and to the oceanic redox systems of nitrogen, iron, and manganese.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
ETNP Cr Isotopes
largerWorkCitation
project
eng; USA
oceans
Eastern Tropical North Pacific (ETNP) oxygen minimum zone off Manzanillo, Mexico; sampling transects run southeast-northwest along the Colima coast (~19-24°N, 106-116°W) and northeast-southwest off the coast (~14-18°N, 106-115°W)
-107.97113
-107.97113
20.88272
20.88272
2014-05-01
2014-06-01
Eastern Tropical North Pacific
0
BCO-DMO catalogue of parameters from Chromium (Cr) concentration and isotope data of chelex-100 extraction method from samples collected on R/V New Horizon cruise NH1410 in May-June 2014
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/925700.rdf
Name: Cruise
Units: unitless
Description: <p>Cruise identifier</p>
http://lod.bco-dmo.org/id/dataset-parameter/925701.rdf
Name: Station
Units: unitless
Description: <p>Station number</p>
http://lod.bco-dmo.org/id/dataset-parameter/925702.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Latitude of sample station, positive values = North</p>
http://lod.bco-dmo.org/id/dataset-parameter/925703.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Longitude of sampling station, negative values = West</p>
http://lod.bco-dmo.org/id/dataset-parameter/925704.rdf
Name: Depth
Units: meters (m)
Description: <p>Depth from which the water sample was collected</p>
http://lod.bco-dmo.org/id/dataset-parameter/925705.rdf
Name: Corrected_CrIII
Units: nanomoles per kilogram (nmnol/kg)
Description: <p>Measured Cr concentration from Chelex resin, corrected for the resin blank</p>
http://lod.bco-dmo.org/id/dataset-parameter/925706.rdf
Name: Corrected_d53Cr
Units: permil (‰)
Description: <p>Corrected Cr isotope ratio</p>
http://lod.bco-dmo.org/id/dataset-parameter/925707.rdf
Name: Measured_CrVI
Units: nanomoles per kilogram (nmnol/kg)
Description: <p>Directly measured dissolved chromium (VI) concentration of the sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/925708.rdf
Name: Measured_d53CrVI
Units: permil (‰)
Description: <p>Directly measured chromium isotope ratio of dissolved Cr(VI) in the sample, permil relative to SRM979</p>
http://lod.bco-dmo.org/id/dataset-parameter/925709.rdf
Name: Calculated_total_Cr
Units: nanomoles per kilogram (nmnol/kg)
Description: <p>Total dissolved Cr concentration of the sample calculated from [Cr(III)] and [Cr(VI)]</p>
http://lod.bco-dmo.org/id/dataset-parameter/925710.rdf
Name: Calculated_total_d53Cr
Units: permil (‰)
Description: <p>Cr isotope ratio of total Cr in the sample, calculated from [Cr(III)] and [Cr(VI)], nmol/kg and d53Cr(III) and d53Cr(VI)</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
687
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/8e7593ab-c96c-43ae-bd77-ad3fefbece1d/content
download
https://doi.org/10.26008/1912/bco-dmo.925670.1
download
onLine
dataset
<p>In this study, we report chromium (Cr) isotopes for Cr(III), Cr(VI), and total Cr from three stations within the eastern tropical North Pacific (ETNP) oxygen deficient zone (ODZ) (see Figs. 1 and 2 of Huang, et al. 2021). Two of these stations (P1 and P2) were collected on cruises Roger Revelle 1804-5 (April to May 2018) and KM1920 (September 2019). The third (2T) was collected on cruise New Horizon 1410 (May 2014) whose primary data are reported in Moos, et al. (2020). Water samples were collected using Niskin Bottles on a CTD rosette or Niskin-X bottles on a TE clean rosette.</p>
<p>To separate Cr species and analyze their isotopic compositions, we used a Mg(OH)2 coprecipitation method similar to that reported in Janssen, et al. (2020) and Davidson, et al. (2019) with some differences in the details:</p>
<p>(1) A 50Cr–54Cr double spike was added to each sample before collecting Mg(OH)2. The double-spike was allowed to equilibrate with samples for ∼6 hours. Tests of equilibration time between 0.5 and 12 hours show no difference in isotopic values.</p>
<p>(2) No iron coprecipitation was done to separate Cr(III) from the Mg matrix. The Mg(OH)2 pellets were dissolved in HCl, pH-adjusted, and ready for column chromatography as described in Moos and Boyle (2019).</p>
<p>(3) To determine Cr(VI) isotopic composition, we filtered the supernatant after the Mg(OH)2 coprecipitation and acidified it to pH 1.9 with HCl for an extended time afterward.</p>
<p>The Cr(VI) that was left in solution converts to Cr(III) which we then analyze by a second double-spike Mg(OH)2 coprecipitation and column purification. Some Cr(VI) isotopic compositions were calculated using the concentration and isotopic composition of total Cr and Cr(III) by mass balance.</p>
<p>Additionally, we analyzed Cr(III) concentrations and isotope ratios by Cr(III) double-spike isotope dilution either at sea or immediately following thawing of frozen samples. Three samples were processed in both ways and all give the same results. The method for total Cr concentration and isotopic composition is described in detail in Moos and Boyle (2019). All of our samples have a within-run error of 0.02 to 0.19‰ (2 SE) on δ53Cr. The average [Cr] and δ53Cr values of a long-term in-house seawater standard are 3.20 ± 0.12 nmol/kg (SD, n = 20) and 1.02 ± 0.13‰ (2 SD, n = 20), respectively.</p>
<p><strong>Instruments:</strong><br />
All Cr isotope measurements were made on an IsoProbe MC-ICP-MS. A 'peak-jump' mode was applied in the Cr isotope analysis on IsoProbe MC-ICP-MS. The plasma mass spectrometer was tuned on an 100 mM NH4S2O8 solution with 1 µM Cr to minimize polyatomic sulfur interferences (i.e. 32S16O1H+ on mass 49, 34S16O+ on mass 50, and 34S16O1H+ on mass 51) by lowering the signal of mass 49 (polyatomic) relative to mass 52 (Cr). Each sample was bracketed by two SRM-DS mixtures with the same sample Cr to DS ratio and similar signal level (within 10%). The δ53Cr data was calculated by iteration on each isotope correction and instrumental mass fractionation (β) in an Excel spreadsheet (Moos and Boyle, 2019). The [Cr] concentration was calculated by averaging the results from the single isotope dilution formula using corrected 50Cr and 54Cr.</p>
Specified by the Principal Investigator(s)
<p>Isotope data was processed using the double spike method as described in Moos and&nbsp;Boyle (2019).</p>
Specified by the Principal Investigator(s)
- Imported original file "Table S2r.xlsx" into the BCO-DMO system.
- Made the longitude values negative to indicate West direction.
- Renamed fields to comply with BCO-DMO naming conventions.
- Rounded Latitude and Longitude columns to 5 decimal places.
- Saved the final file as "925670_v1_tables2_cr_conc_and_isotopes_nh1410.csv".
Specified by BCO-DMO Data Managers
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
IsoProbe MC-ICP-MS
IsoProbe MC-ICP-MS
PI Supplied Instrument Name: IsoProbe MC-ICP-MS Instrument Name: Inductively Coupled Plasma Mass Spectrometer Instrument Short Name:ICP Mass Spec Instrument Description: An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/
Niskin bottles and Niskin-X bottles
Niskin bottles and Niskin-X bottles
PI Supplied Instrument Name: Niskin bottles and Niskin-X bottles Instrument Name: Niskin bottle Instrument Short Name:Niskin bottle Instrument Description: A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc. Community Standard Description: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/
Cruise: NH1410
NH1410
R/V New Horizon
Community Standard Description
International Council for the Exploration of the Sea
R/V New Horizon
vessel
NH1410
Frank James Stewart
Georgia Institute of Technology
http://dmoserv3.whoi.edu/data_docs/OMZ_SulfurCycling/Cruise_Report_NH1410.pdf
Report describing NH1410
R/V New Horizon
Community Standard Description
International Council for the Exploration of the Sea
R/V New Horizon
vessel