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Dataset Title:  Po, Pb and Be partition coefficients on nanoparticles from laboratory
experiments
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_738639)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Data Access Form | Files
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  System {
    String bcodmo_name "sample_descrip";
    String description "Type of sorption experiment.";
    String long_name "System";
    String units "unitless";
  }
  Organic_nanoparticle {
    String bcodmo_name "sample_descrip";
    String description "organic nanoparticle in solution.";
    String long_name "Organic Nanoparticle";
    String units "unitless";
  }
  Inorganic_nanoparticle {
    String bcodmo_name "sample_descrip";
    String description "inorganic nanoparticle in solution.";
    String long_name "Inorganic Nanoparticle";
    String units "unitless";
  }
  Pb210_recovery {
    Byte _FillValue 127;
    Byte actual_range 80, 96;
    String bcodmo_name "trace_metal_conc";
    String description "Chemical recovery of 210Pb in percent (%)";
    String long_name "Pb210 Recovery";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "unitless";
  }
  err_Pbrec {
    Byte _FillValue 127;
    Byte actual_range 1, 6;
    String bcodmo_name "trace_metal_conc";
    String description "Error of chemical recovery of 210Pb in percent (%)";
    String long_name "Err Pbrec";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "unitless";
  }
  Be7_recovery {
    Byte _FillValue 127;
    Byte actual_range 87, 108;
    String bcodmo_name "trace_metal_conc";
    String description "Chemical recovery of 7Be in percent (%)";
    String long_name "Be7 Recovery";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "unitless";
  }
  err_Berec {
    Byte _FillValue 127;
    Byte actual_range 2, 4;
    String bcodmo_name "trace_metal_conc";
    String description "Error of chemical recovery of 7Be in percent (%)";
    String long_name "Err Berec";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "unitless";
  }
  Po210_recovery {
    Byte _FillValue 127;
    Byte actual_range 75, 89;
    String bcodmo_name "trace_metal_conc";
    String description "Chemical recovery of 210Po in percent (%)";
    String long_name "Po210 Recovery";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "unitless";
  }
  err_Porec {
    Byte _FillValue 127;
    Byte actual_range 7, 12;
    String bcodmo_name "trace_metal_conc";
    String description "Error of chemical recovery of 210Po in percent (%)";
    String long_name "Err Porec";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "unitless";
  }
  Partition_coefficient_of_210Pb_Kc {
    Float32 _FillValue NaN;
    Float32 actual_range 0.48, 1555.7;
    String bcodmo_name "trace_metal_conc";
    String description "The partition coefficient of 210Pb between true solution (";
    String long_name "Partition Coefficient Of 210 Pb Kc";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "10^4 Liters per Kilogram (L/kg)";
  }
  err_Kc_Pb {
    Float32 _FillValue NaN;
    Float32 actual_range 0.04, 148.08;
    String bcodmo_name "trace_metal_conc";
    String description "Error of the partition coefficient of 210Pb between true solution (";
    String long_name "Err Kc Pb";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "10^4 Liters per Kilogram (L/kg)";
  }
  Partition_coefficient_of_7Be_Kc {
    Float32 _FillValue NaN;
    Float32 actual_range 0.11, 175.85;
    String bcodmo_name "trace_metal_conc";
    String description "The partition coefficient of 7Be between true solution (";
    String long_name "Partition Coefficient Of 7 Be Kc";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "10^4 Liters per Kilogram (L/kg)";
  }
  err_Kc_Be {
    Float32 _FillValue NaN;
    Float32 actual_range 0.03, 16.8;
    String bcodmo_name "trace_metal_conc";
    String description "Error of the partition coefficient of 7Be between true solution (";
    String long_name "Err Kc Be";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "10^4 Liters per Kilogram (L/kg)";
  }
  Partition_coefficient_of_210Po_Kc {
    Float32 _FillValue NaN;
    Float32 actual_range 0.42, 22.38;
    String bcodmo_name "trace_metal_conc";
    String description "The partition coefficient of 210Po between true solution (";
    String long_name "Partition Coefficient Of 210 Po Kc";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "10^4 Liters per Kilogram (L/kg)";
  }
  err_Kc_Po {
    Float32 _FillValue NaN;
    Float32 actual_range 0.04, 1.51;
    String bcodmo_name "trace_metal_conc";
    String description "Error of the partition coefficient of 210Po between true solution (";
    String long_name "Err Kc Po";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
    String units "10^4 Liters per Kilogram (L/kg)";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description 
"Natural seawater from the Gulf of Mexico with a salinity of 35.0 was filtered
and ultrafiltered sequentially through a 0.4 \\u00b5m cartridge (GE-Osmonics)
and a 1 kDa ultrafiltration membrane (Millipore-Amicon), to remove suspended
particles and colloidal matter. 210Po and 210Pb (in equilibrium) in 1 N HNO3-2
N HCl were purchased from Eckert & Ziegler Isotopes Products. 7Be tracer was
produced at the Paul Scherrer Institute, Switzerland and preserved in 0.5 N
HCl. All experiments were conducted in a constant temperature laboratory to
avoid the influence of changing temperature.\\u00a0
 
For sorption experiments, 49 ml of the <1 kDa ultrafiltrate of seawater in a
stirred-cell unit was added with 1 ml of non-complexing Tris-HCl buffer
solution to maintain a constant pH of 8.1 and to prevent formation of pseudo-
colloids during the addition of spikes. For the single-sorbent experiments, 2
mg of inorganic particles was added into the solution while stirring,
corresponding to a particle concentration of about 40 mg/l. Successively, a
total of 0.2 ml of 210Pb, 210Pb and 7Be spikes, with the activities of 100 Bq,
100 Bq and 150 Bq respectively, were added drop by drop while stirring.\\u00a0
The pH value was checked after adding spikes and found to be 8.1. For the
single MOC experiments, procedures were the same as described above. The final
concentration of HA, APS or BSA was at 1 mg/l.\\u00a0
 
An equilibrium time of 2 h was consistently used in all experiments. After 2
h, the particulate or colloidal phases were separated through ultrafiltration
using a 1 kDa membrane (Amicon YM1). The >1 kDa retentate (final volume of ~4
ml) and aliquot of the <1 kDa ultrafiltrate or permeate solutions (10 ml) were
transferred into a counting vial for \\u03b3-counting.  
 For the binary-sorbent experiments, macromolecular organic matter was added
after the inorganic nanoparticles. The experimental solution was then stirred
for 30 min to allow inorganic particles to interact with MOCs. After that,
spikes were added. Other experimental procedures were the same as the single-
sorbent experiments.
 
Retentate and permeate samples were measured for 210Pb and 7Be by non-
destructive gamma counting using a Canberra ultra-high purity germanium well
detector. The counting efficiencies at different sample geometries (1-10 ml)
at 46.5 keV for 210Pb and 477.6 keV for 7Be were calibrated using tracers with
certified activities.\\u00a0
 
The activities of 210Po in samples were measured using \\u03b1-spectrometry.
For the permeate samples, 5 ml of permeate was acidified to pH <1.5 with HCl,
then\\u00a0 4 Bq 209Po was added, followed by ascorbic acid powder, 1 ml of
hydroxylamine hydrochloride (20%) and 1 ml of sodium citrate (25%).\\u00a0
Finally, the mixed solution was adjusted to a pH of 1.5. Polonium isotopes,
including 209Po and 210Po, were plated on a silver disc at 90\\u00baC for 4 h
under stirring. Procedures for the retentate samples were the same, except
that the retentate was digested with mixed acids. Then, the solution was dried
to near dryness.\\u00a0
 
\\u00a0Activities of 209Po and 210Po on silver disc were counted by a Canberra
alpha analyst system. The procedural efficiencies of Po isotopes were
determined by the measured 209Po and initially added 209Po activities.";
    String awards_0_award_nid "735995";
    String awards_0_award_number "OCE-1356453";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1356453";
    String awards_0_funder_name "NSF Division of Ocean Sciences";
    String awards_0_funding_acronym "NSF OCE";
    String awards_0_funding_source_nid "355";
    String awards_0_program_manager "Henrietta N Edmonds";
    String awards_0_program_manager_nid "51517";
    String cdm_data_type "Other";
    String comment 
"Po, Pb and Be partition coefficients on nanoparticles 
  PI: Peter Santschi 
  Version: 2018-05-14";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_type "institution";
    String creator_url "https://www.bco-dmo.org/";
    String data_source "extract_data_as_tsv version 2.3  19 Dec 2019";
    String date_created "2018-06-15T20:13:12Z";
    String date_modified "2019-09-24T20:07:28Z";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.1575/1912/bco-dmo.738639.1";
    String history 
"2024-04-22T04:10:45Z (local files)
2024-04-22T04:10:45Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_738639.das";
    String infoUrl "https://www.bco-dmo.org/dataset/738639";
    String institution "BCO-DMO";
    String instruments_0_acronym "Spectrometer";
    String instruments_0_dataset_instrument_description "Alpha-spectrometry, Canberra corporation.";
    String instruments_0_dataset_instrument_nid "738649";
    String instruments_0_description "A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0460/";
    String instruments_0_instrument_name "Spectrometer";
    String instruments_0_instrument_nid "667";
    String instruments_0_supplied_name "Alpha-spectrometry";
    String instruments_1_dataset_instrument_description "Canberra ultra-high purity germanium well detector.";
    String instruments_1_dataset_instrument_nid "738648";
    String instruments_1_description "Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.";
    String instruments_1_instrument_name "Gamma Ray Spectrometer";
    String instruments_1_instrument_nid "670659";
    String instruments_1_supplied_name "Gamma-spectrometry";
    String keywords "bco, bco-dmo, be7, Be7_recovery, berec, biological, chemical, coefficient, data, dataset, dmo, erddap, err_Berec, err_Kc_Be, err_Kc_Pb, err_Kc_Po, err_Pbrec, err_Porec, error, inorganic, Inorganic_nanoparticle, management, nanoparticle, oceanography, office, organic, Organic_nanoparticle, partition, Partition_coefficient_of_210Pb_Kc, Partition_coefficient_of_210Po_Kc, Partition_coefficient_of_7Be_Kc, pb210, Pb210_recovery, pbrec, po210, Po210_recovery, porec, preliminary, recovery, system";
    String license "https://www.bco-dmo.org/dataset/738639/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/738639";
    String param_mapping "{'738639': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/738639/parameters";
    String people_0_affiliation "Texas A&M, Galveston";
    String people_0_affiliation_acronym "TAMUG";
    String people_0_person_name "Peter Santschi";
    String people_0_person_nid "735998";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Texas A&M, Galveston";
    String people_1_affiliation_acronym "TAMUG";
    String people_1_person_name "Antonietta Quigg";
    String people_1_person_nid "736000";
    String people_1_role "Co-Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "Texas A&M, Galveston";
    String people_2_affiliation_acronym "TAMUG";
    String people_2_person_name "Kathleen Schwehr";
    String people_2_person_nid "736002";
    String people_2_role "Co-Principal Investigator";
    String people_2_role_type "originator";
    String people_3_affiliation "Texas A&M, Galveston";
    String people_3_affiliation_acronym "TAMUG";
    String people_3_person_name "Chen Xu";
    String people_3_person_nid "736004";
    String people_3_role "Co-Principal Investigator";
    String people_3_role_type "originator";
    String people_4_affiliation "Woods Hole Oceanographic Institution";
    String people_4_affiliation_acronym "WHOI BCO-DMO";
    String people_4_person_name "Mathew Biddle";
    String people_4_person_nid "708682";
    String people_4_role "BCO-DMO Data Manager";
    String people_4_role_type "related";
    String project "Biopolymers for radionuclides";
    String projects_0_acronym "Biopolymers for radionuclides";
    String projects_0_description 
"NSF Award Abstract:
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.
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.
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.
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.";
    String projects_0_end_date "2018-02";
    String projects_0_name "Biopolymers as carrier phases for selected natural radionuclides (of Th, Pa, Pb, Po, Be) in diatoms and coccolithophores";
    String projects_0_project_nid "735996";
    String projects_0_start_date "2014-03";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Laboratory sorption experiments were carried out to examine the adsorption of 210Po, 210Pb and 7Be and their fractionation on inorganic nanoparticles, including SiO2,CaCO3, Al2O3, TiO2 and Fe2O3, in the presence or absence of macromolecular organic compounds (MOCs) that include humic acids (HA), acid polysaccharides (APS) and proteins (BSA), in natural seawater.";
    String title "Po, Pb and Be partition coefficients on nanoparticles from laboratory experiments";
    String version "1";
    String xml_source "osprey2erddap.update_xml() v1.3";
  }
}

 

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.


 
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