http://lod.bco-dmo.org/id/dataset/764664
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
2019-04-10
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be
2019-04-10
publication
2019-04-10
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2019-04-11
publication
https://doi.org/10.1575/1912/bco-dmo.764664.1
Peter Santschi
Texas A&M, Galveston
principalInvestigator
Antonietta Quigg
Texas A&M, Galveston
principalInvestigator
Kathleen Schwehr
Texas A&M, Galveston
principalInvestigator
Chen Xu
Texas A&M, Galveston
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: Santschi, P., Quigg, A., Schwehr, K., Xu, C. (2019) Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-04-10 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.764664.1 [access date]
Laboratory studies of radionuclides (234Th, 233Pa, 210Po, 210Pb, and 7Be) binding with fractions from cultured diatom, Phaeodactylum tricornutum Dataset Description: <p>Laboratory studies were conducted to examine the sorption of selected radionuclides (234Th, 233Pa, 210Po,<br />
210Pb, and 7Be) onto inorganic (pure silica and acid-cleaned diatom frustules) and organic (diatom cells with or<br />
without silica frustules) particles in natural seawater and the role of templating biomolecules and exopolymeric<br />
substances (EPS) extracted from the same species of diatom, Phaeodactylum tricornutum, in the sorption process.<br />
The range of partition coefficients (Kd, reported as logKd) of radionuclides between water and the different<br />
particle types was 4.78–6.69 for 234Th, 5.23–6.71 for 233Pa, 4.44–5.86 for 210Pb, 4.47–4.92 for 210Po, and 4.93–7.23 for 7Be, similar to values reported for lab and field determinations. The sorption of all radionuclides was<br />
significantly enhanced in the presence of organic matter associated with particles, resulting in Kd one to two<br />
orders of magnitude higher than for inorganic particles only, with highest values for 7Be (logKd of 7.2). Results<br />
further indicate that EPS and frustule-embedded biomolecules in diatom cells are responsible for the sorption<br />
enhancement rather than the silica shell itself. By separating radiolabeled EPS via isoelectric focusing, we found<br />
that isoelectric points are radionuclide specific, suggesting that each radionuclide binds to specific biopolymeric<br />
functional groups, with the most efficient binding sites likely occurring in acid polysaccharides, iron hydroxides,<br />
and proteins. Further progress in evaluating the effects of diatom frustule–related biopolymers on binding,<br />
scavenging, and fractionation of radionuclides would require the application of molecular-level characterization<br />
techniques.</p> Methods and Sampling: <p>&nbsp;</p>
<p>Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be<br />
Activity concentrations of 234Th, 233Pa, 210Pb, 210Po, and 7Be were measured by gamma counting the 63.5, 312, 46.5, and 477.6 keV lines, respectively, on a Canberra ultra-highpurity germanium well-type detector. The 210Po activity was analyzed by liquid scintillation counting (Beckman Model 8100 Liquid Scintillation Counter). The filter samples (&gt; 0.2 um particulate phase) were soaked with 1 mol L-1 HCl for 20 min in a counting vial, and the filtrate samples (&lt; 0.2 um dissolved phase) were transferred into counting vials directly. Both filter and filtrate samples were then counted for activities of each radionuclide. All reported activities were decay and geometry corrected. 233Pa was added in equilibrium with 237Np. Under a wide range of environmental conditions, aqueous neptunium speciation is believed to be dominated by the pentavalent cation NpO2+. Np(V) is relative soluble and tends to remain in the water phase, unlike other actinides, such as Pu and Am, which are readily adsorbed by particles in the environment (Atwood 2013). In our absorption experiments, 237Np activities could be found only in the dissolved phase for all samples, supporting the assumption that 237Np would not adsorb onto particles during the time for which decay and in-growth corrections of 233Pa were applied. Traditional partition coefficients (Kd) between dissolved and particulate phases were used to quantify the sorption of radionuclides onto different particles in different experimental systems. Kd was defined here as</p>
<p>Kd = Ap x (Ad x Cp)^-1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(1)</p>
<p>where Ap and Ad represent particulate and dissolved activities (Bq L-1) of radionuclides and Cp is the particle concentration (kg L-1; Honeyman and Santschi 1989; Guo and Santschi 1997).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1356453 Award URL: http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1356453
completed
Peter Santschi
Texas A&M, Galveston
4097404476
200 Seawolf Pkwy
Galveston
TX
77553
US
santschi@tamug.edu
pointOfContact
Antonietta Quigg
Texas A&M, Galveston
409-740-4990
200 Seawolf Pkwy
Galveston
TX
77553
quigga@tamug.edu
pointOfContact
Kathleen Schwehr
Texas A&M, Galveston
200 Seawolf Pkwy
Galveston
TX
77553
pointOfContact
Chen Xu
Texas A&M, Galveston
409-354-8312
200 Seawolf Pkwy
Galveston
TX
77553
xuc@tamug.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Particle_type
Be
Be_sd
Pa
Pa_sd
Th
Th_sd
Po
Po_sd
Pb
Pb_sd
Beckman Model 8100 Liquid Scintillation Counter
Pharmacia Biotech Multiphor II
Canberra ultra-highpurity germanium well-type detector
theme
None, User defined
No BCO-DMO term
radioactive isotope concentration
featureType
BCO-DMO Standard Parameters
Liquid Scintillation Counter
Electrophoresis Chamber
Gamma Ray Spectrometer
instrument
BCO-DMO Standard Instruments
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.
Biopolymers as carrier phases for selected natural radionuclides (of Th, Pa, Pb, Po, Be) in diatoms and coccolithophores
https://www.bco-dmo.org/project/735996
Biopolymers as carrier phases for selected natural radionuclides (of Th, Pa, Pb, Po, Be) in diatoms and coccolithophores
<p><span style="background-color:transparent; color:rgb(0, 0, 0); font-family:arial; font-size:11pt">NSF Award Abstract:</span></p>
<p>Particle-associated natural radioisotopes are transported to the ocean floor mostly via silica and carbonate ballasted particles, allowing their use as tracers for particle transport. Th(IV), Pa (IV,V), Po(IV), Pb(II) and Be(II) radionuclides are important proxies in oceanographic investigations, used for tracing particle and colloid cycling, estimating export fluxes of particulate organic carbon, tracing air-sea exchange, paleoproductivity, and/or ocean circulation in paleoceanographic studies. Even though tracer approaches are considered routine, there are cases where data interpretation or validity has become controversial, largely due to uncertainties about inorganic proxies and organic carrier molecules. Recent studies showed that cleaned diatom frustules and pure silica particles, sorb natural radionuclides to a much lower extent (by 1-2 orders of magnitude) than whole diatom cells (with or without shells). Phytoplankton that build siliceous or calcareous shells, such as the diatoms and coccolithophores, are assembled via bio-mineralization processes using biopolymers as nanoscale templates. These templates could serve as possible carriers for radionuclides and stable metals.</p>
<p>In this project, a research team at the Texas A & M University at Galveston hypothesize that radionuclide sorption is controlled by selective biopolymers that are associated with biogenic opal (diatoms), CaCO3 (coccolithophores) and the attached exopolymeric substances (EPS), rather than to pure mineral phase. To pursue this idea, the major objectives of their research will include separation, identification and molecular-level characterization of the individual biopolymers (e.g., polysaccharides, uronic acids, proteins, hydroquinones, hydroxamate siderophores, etc.) that are responsible for binding different radionuclides (Th, Pa, Pb, Po and Be) attached to cells or in the matrix of biogenic opal or CaCO3 as well as attached EPS mixture, in laboratory grown diatom and coccolithophore cultures. Laboratory-scale radiolabeling experiments will be conducted, and different separation techniques and characterization techniques will be applied.</p>
<p>Intellectual Merit : It is expected that this study will help elucidate the molecular basis of the templated growth of diatoms and coccoliths, EPS and their role in scavenging natural radionuclides in the ocean, and help resolve debates on the oceanographic tracer applications of different natural radioisotopes (230,234Th, 231Pa, 210Po, 210Pb and 7,10Be). The proposed interdisciplinary research project will require instrumental approaches for molecular-level characterization of these radionuclides associated carrier molecules.</p>
<p>Broader Impacts: The results of this study will be relevant for understanding biologically mediated ocean scavenging of radionuclides by diatoms and coccoliths which is important for carbon cycling in the ocean, and will contribute to improved interpretation of data obtained by field studies especially through the GEOTRACES program. This new program will enhance training programs at TAMUG for postdocs, graduate and undergraduate students. Lastly, results will be integrated in college courses and out-reach activities at Texas A&M University, including NSF-REU, Sea Camp, Elder Hostel and exhibits at the local science fair and interaction with its after-school program engaging Grade 9-12 students from groups traditionally underrepresented.</p>
Biopolymers for radionuclides
largerWorkCitation
project
eng; USA
oceans
2019-04-10
0
BCO-DMO catalogue of parameters from Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be
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/764674.rdf
Name: Particle_type
Units: unitless
Description: radionuclide type
http://lod.bco-dmo.org/id/dataset-parameter/764675.rdf
Name: Be
Units: kilogram per liter (kg/L)
Description: activity concentration of Be as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764676.rdf
Name: Be_sd
Units: kilogram per liter (kg/L)
Description: Standard deviation of Be activity concentration as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764677.rdf
Name: Pa
Units: kilogram per liter (kg/L)
Description: activity concentration of Pa as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764678.rdf
Name: Pa_sd
Units: kilogram per liter (kg/L)
Description: Standard deviation of Pa activity concentration as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764679.rdf
Name: Th
Units: kilogram per liter (kg/L)
Description: activity concentration of Th as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764680.rdf
Name: Th_sd
Units: kilogram per liter (kg/L)
Description: Standard deviation of Th activity concentration as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764681.rdf
Name: Po
Units: kilogram per liter (kg/L)
Description: activity concentration of Po as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764682.rdf
Name: Po_sd
Units: kilogram per liter (kg/L)
Description: Standard deviation of Po activity concentration as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764683.rdf
Name: Pb
Units: kilogram per liter (kg/L)
Description: activity concentration of Pb as traditional partition coefficients
http://lod.bco-dmo.org/id/dataset-parameter/764684.rdf
Name: Pb_sd
Units: kilogram per liter (kg/L)
Description: Standard deviation of Pb activity concentration as traditional partition coefficients
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
287
https://darchive.mblwhoilibrary.org/bitstream/1912/24004/1/dataset-764664_logkd__v1.tsv
download
https://doi.org/10.1575/1912/bco-dmo.764664.1
download
onLine
dataset
<p>&nbsp;</p>
<p>Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be<br />
Activity concentrations of 234Th, 233Pa, 210Pb, 210Po, and 7Be were measured by gamma counting the 63.5, 312, 46.5, and 477.6 keV lines, respectively, on a Canberra ultra-highpurity germanium well-type detector. The 210Po activity was analyzed by liquid scintillation counting (Beckman Model 8100 Liquid Scintillation Counter). The filter samples (&gt; 0.2 um particulate phase) were soaked with 1 mol L-1 HCl for 20 min in a counting vial, and the filtrate samples (&lt; 0.2 um dissolved phase) were transferred into counting vials directly. Both filter and filtrate samples were then counted for activities of each radionuclide. All reported activities were decay and geometry corrected. 233Pa was added in equilibrium with 237Np. Under a wide range of environmental conditions, aqueous neptunium speciation is believed to be dominated by the pentavalent cation NpO2+. Np(V) is relative soluble and tends to remain in the water phase, unlike other actinides, such as Pu and Am, which are readily adsorbed by particles in the environment (Atwood 2013). In our absorption experiments, 237Np activities could be found only in the dissolved phase for all samples, supporting the assumption that 237Np would not adsorb onto particles during the time for which decay and in-growth corrections of 233Pa were applied. Traditional partition coefficients (Kd) between dissolved and particulate phases were used to quantify the sorption of radionuclides onto different particles in different experimental systems. Kd was defined here as</p>
<p>Kd = Ap x (Ad x Cp)^-1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(1)</p>
<p>where Ap and Ad represent particulate and dissolved activities (Bq L-1) of radionuclides and Cp is the particle concentration (kg L-1; Honeyman and Santschi 1989; Guo and Santschi 1997).</p>
Specified by the Principal Investigator(s)
<p>BCO-DMO Processing Notes:<br />
-&nbsp;added conventional header with dataset name, PI name, version date<br />
- modified parameter names to conform with BCO-DMO naming conventions<br />
- combined the two submitted tables together on the pH column, indicating percent activity and percent composition in the parameter names.</p>
<p>&nbsp;</p>
Specified by the Principal Investigator(s)
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
Beckman Model 8100 Liquid Scintillation Counter
Beckman Model 8100 Liquid Scintillation Counter
PI Supplied Instrument Name: Beckman Model 8100 Liquid Scintillation Counter PI Supplied Instrument Description:The 210Po activity was analyzed by liquid scintillation counting (Beckman Model 8100 Liquid Scintillation Counter). Instrument Name: Liquid Scintillation Counter Instrument Short Name:LSC Instrument Description: Liquid scintillation counting is an analytical technique which is defined by the incorporation of the radiolabeled analyte into uniform distribution with a liquid chemical medium capable of converting the kinetic energy of nuclear emissions into light energy. Although the liquid scintillation counter is a sophisticated laboratory counting system used the quantify the activity of particulate emitting (ß and a) radioactive samples, it can also detect the auger electrons emitted from 51Cr and 125I samples. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB21/
Pharmacia Biotech Multiphor II
Pharmacia Biotech Multiphor II
PI Supplied Instrument Name: Pharmacia Biotech Multiphor II PI Supplied Instrument Description:For IEF (isoelectric focusing electrophoresis), a Pharmacia Biotech Multiphor II with a EPS3500 XL power supply was used. Instrument Name: Electrophoresis Chamber Instrument Short Name: Instrument Description: General term for an apparatus used in clinical and research laboratories to separate charged colloidal particles (or molecules) of varying size through a medium by applying an electric field.
Canberra ultra-highpurity germanium well-type detector
Canberra ultra-highpurity germanium well-type detector
PI Supplied Instrument Name: Canberra ultra-highpurity germanium well-type detector PI Supplied Instrument Description:Activity concentrations of 234Th, 233Pa, 210Pb, 210Po, and 7Be were measured by gamma counting the 63.5, 312, 46.5, and 477.6 keV lines, respectively, on a Canberra ultra-highpurity
germanium well-type detector. Instrument Name: Gamma Ray Spectrometer Instrument Short Name: Instrument Description: Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.