ERDDAP > info > bcodmo_dataset_738639

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
		data	graph		files	public	Po, Pb and Be partition coefficients on nanoparticles from laboratory experiments		I   M	background			BCO-DMO	bcodmo_dataset_738639

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	access_formats	String	.htmlTable,.csv,.json,.mat,.nc,.tsv
attribute	NC_GLOBAL	acquisition_description	String	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.
attribute	NC_GLOBAL	awards_0_award_nid	String	735995
attribute	NC_GLOBAL	awards_0_award_number	String	OCE-1356453
attribute	NC_GLOBAL	awards_0_data_url	String	http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1356453
attribute	NC_GLOBAL	awards_0_funder_name	String	NSF Division of Ocean Sciences
attribute	NC_GLOBAL	awards_0_funding_acronym	String	NSF OCE
attribute	NC_GLOBAL	awards_0_funding_source_nid	String	355
attribute	NC_GLOBAL	awards_0_program_manager	String	Henrietta N Edmonds
attribute	NC_GLOBAL	awards_0_program_manager_nid	String	51517
attribute	NC_GLOBAL	cdm_data_type	String	Other
attribute	NC_GLOBAL	comment	String	Po, Pb and Be partition coefficients on nanoparticles PI: Peter Santschi Version: 2018-05-14
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	info at bco-dmo.org
attribute	NC_GLOBAL	creator_name	String	BCO-DMO
attribute	NC_GLOBAL	creator_type	String	institution
attribute	NC_GLOBAL	creator_url	String	https://www.bco-dmo.org/
attribute	NC_GLOBAL	data_source	String	extract_data_as_tsv version 2.3 19 Dec 2019
attribute	NC_GLOBAL	date_created	String	2018-06-15T20:13:12Z
attribute	NC_GLOBAL	date_modified	String	2019-09-24T20:07:28Z
attribute	NC_GLOBAL	defaultDataQuery	String	&amp;time&lt;now
attribute	NC_GLOBAL	doi	String	10.1575/1912/bco-dmo.738639.1
attribute	NC_GLOBAL	infoUrl	String	https://www.bco-dmo.org/dataset/738639
attribute	NC_GLOBAL	institution	String	BCO-DMO
attribute	NC_GLOBAL	instruments_0_acronym	String	Spectrometer
attribute	NC_GLOBAL	instruments_0_dataset_instrument_description	String	Alpha-spectrometry, Canberra corporation.
attribute	NC_GLOBAL	instruments_0_dataset_instrument_nid	String	738649
attribute	NC_GLOBAL	instruments_0_description	String	A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum.
attribute	NC_GLOBAL	instruments_0_instrument_external_identifier	String	https://vocab.nerc.ac.uk/collection/L22/current/TOOL0460/
attribute	NC_GLOBAL	instruments_0_instrument_name	String	Spectrometer
attribute	NC_GLOBAL	instruments_0_instrument_nid	String	667
attribute	NC_GLOBAL	instruments_0_supplied_name	String	Alpha-spectrometry
attribute	NC_GLOBAL	instruments_1_dataset_instrument_description	String	Canberra ultra-high purity germanium well detector.
attribute	NC_GLOBAL	instruments_1_dataset_instrument_nid	String	738648
attribute	NC_GLOBAL	instruments_1_description	String	Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.
attribute	NC_GLOBAL	instruments_1_instrument_name	String	Gamma Ray Spectrometer
attribute	NC_GLOBAL	instruments_1_instrument_nid	String	670659
attribute	NC_GLOBAL	instruments_1_supplied_name	String	Gamma-spectrometry
attribute	NC_GLOBAL	keywords	String	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
attribute	NC_GLOBAL	license	String	https://www.bco-dmo.org/dataset/738639/license
attribute	NC_GLOBAL	metadata_source	String	https://www.bco-dmo.org/api/dataset/738639
attribute	NC_GLOBAL	param_mapping	String	{'738639': {}}
attribute	NC_GLOBAL	parameter_source	String	https://www.bco-dmo.org/mapserver/dataset/738639/parameters
attribute	NC_GLOBAL	people_0_affiliation	String	Texas A&M, Galveston
attribute	NC_GLOBAL	people_0_affiliation_acronym	String	TAMUG
attribute	NC_GLOBAL	people_0_person_name	String	Peter Santschi
attribute	NC_GLOBAL	people_0_person_nid	String	735998
attribute	NC_GLOBAL	people_0_role	String	Principal Investigator
attribute	NC_GLOBAL	people_0_role_type	String	originator
attribute	NC_GLOBAL	people_1_affiliation	String	Texas A&M, Galveston
attribute	NC_GLOBAL	people_1_affiliation_acronym	String	TAMUG
attribute	NC_GLOBAL	people_1_person_name	String	Antonietta Quigg
attribute	NC_GLOBAL	people_1_person_nid	String	736000
attribute	NC_GLOBAL	people_1_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_1_role_type	String	originator
attribute	NC_GLOBAL	people_2_affiliation	String	Texas A&M, Galveston
attribute	NC_GLOBAL	people_2_affiliation_acronym	String	TAMUG
attribute	NC_GLOBAL	people_2_person_name	String	Kathleen Schwehr
attribute	NC_GLOBAL	people_2_person_nid	String	736002
attribute	NC_GLOBAL	people_2_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_2_role_type	String	originator
attribute	NC_GLOBAL	people_3_affiliation	String	Texas A&M, Galveston
attribute	NC_GLOBAL	people_3_affiliation_acronym	String	TAMUG
attribute	NC_GLOBAL	people_3_person_name	String	Chen Xu
attribute	NC_GLOBAL	people_3_person_nid	String	736004
attribute	NC_GLOBAL	people_3_role	String	Co-Principal Investigator
attribute	NC_GLOBAL	people_3_role_type	String	originator
attribute	NC_GLOBAL	people_4_affiliation	String	Woods Hole Oceanographic Institution
attribute	NC_GLOBAL	people_4_affiliation_acronym	String	WHOI BCO-DMO
attribute	NC_GLOBAL	people_4_person_name	String	Mathew Biddle
attribute	NC_GLOBAL	people_4_person_nid	String	708682
attribute	NC_GLOBAL	people_4_role	String	BCO-DMO Data Manager
attribute	NC_GLOBAL	people_4_role_type	String	related
attribute	NC_GLOBAL	project	String	Biopolymers for radionuclides
attribute	NC_GLOBAL	projects_0_acronym	String	Biopolymers for radionuclides
attribute	NC_GLOBAL	projects_0_description	String	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.
attribute	NC_GLOBAL	projects_0_end_date	String	2018-02
attribute	NC_GLOBAL	projects_0_name	String	Biopolymers as carrier phases for selected natural radionuclides (of Th, Pa, Pb, Po, Be) in diatoms and coccolithophores
attribute	NC_GLOBAL	projects_0_project_nid	String	735996
attribute	NC_GLOBAL	projects_0_start_date	String	2014-03
attribute	NC_GLOBAL	publisher_name	String	Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	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.
attribute	NC_GLOBAL	title	String	Po, Pb and Be partition coefficients on nanoparticles from laboratory experiments
attribute	NC_GLOBAL	version	String	1
attribute	NC_GLOBAL	xml_source	String	osprey2erddap.update_xml() v1.3
variable	System		String
attribute	System	bcodmo_name	String	sample_descrip
attribute	System	description	String	Type of sorption experiment.
attribute	System	long_name	String	System
attribute	System	units	String	unitless
variable	Organic_nanoparticle		String
attribute	Organic_nanoparticle	bcodmo_name	String	sample_descrip
attribute	Organic_nanoparticle	description	String	organic nanoparticle in solution.
attribute	Organic_nanoparticle	long_name	String	Organic Nanoparticle
attribute	Organic_nanoparticle	units	String	unitless
variable	Inorganic_nanoparticle		String
attribute	Inorganic_nanoparticle	bcodmo_name	String	sample_descrip
attribute	Inorganic_nanoparticle	description	String	inorganic nanoparticle in solution.
attribute	Inorganic_nanoparticle	long_name	String	Inorganic Nanoparticle
attribute	Inorganic_nanoparticle	units	String	unitless
variable	Pb210_recovery		byte
attribute	Pb210_recovery	_FillValue	byte	127
attribute	Pb210_recovery	actual_range	byte	80, 96
attribute	Pb210_recovery	bcodmo_name	String	trace_metal_conc
attribute	Pb210_recovery	description	String	Chemical recovery of 210Pb in percent (%)
attribute	Pb210_recovery	long_name	String	Pb210 Recovery
attribute	Pb210_recovery	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	Pb210_recovery	units	String	unitless
variable	err_Pbrec		byte
attribute	err_Pbrec	_FillValue	byte	127
attribute	err_Pbrec	actual_range	byte	1, 6
attribute	err_Pbrec	bcodmo_name	String	trace_metal_conc
attribute	err_Pbrec	description	String	Error of chemical recovery of 210Pb in percent (%)
attribute	err_Pbrec	long_name	String	Err Pbrec
attribute	err_Pbrec	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	err_Pbrec	units	String	unitless
variable	Be7_recovery		byte
attribute	Be7_recovery	_FillValue	byte	127
attribute	Be7_recovery	actual_range	byte	87, 108
attribute	Be7_recovery	bcodmo_name	String	trace_metal_conc
attribute	Be7_recovery	description	String	Chemical recovery of 7Be in percent (%)
attribute	Be7_recovery	long_name	String	Be7 Recovery
attribute	Be7_recovery	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	Be7_recovery	units	String	unitless
variable	err_Berec		byte
attribute	err_Berec	_FillValue	byte	127
attribute	err_Berec	actual_range	byte	2, 4
attribute	err_Berec	bcodmo_name	String	trace_metal_conc
attribute	err_Berec	description	String	Error of chemical recovery of 7Be in percent (%)
attribute	err_Berec	long_name	String	Err Berec
attribute	err_Berec	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	err_Berec	units	String	unitless
variable	Po210_recovery		byte
attribute	Po210_recovery	_FillValue	byte	127
attribute	Po210_recovery	actual_range	byte	75, 89
attribute	Po210_recovery	bcodmo_name	String	trace_metal_conc
attribute	Po210_recovery	description	String	Chemical recovery of 210Po in percent (%)
attribute	Po210_recovery	long_name	String	Po210 Recovery
attribute	Po210_recovery	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	Po210_recovery	units	String	unitless
variable	err_Porec		byte
attribute	err_Porec	_FillValue	byte	127
attribute	err_Porec	actual_range	byte	7, 12
attribute	err_Porec	bcodmo_name	String	trace_metal_conc
attribute	err_Porec	description	String	Error of chemical recovery of 210Po in percent (%)
attribute	err_Porec	long_name	String	Err Porec
attribute	err_Porec	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	err_Porec	units	String	unitless
variable	Partition_coefficient_of_210Pb_Kc		float
attribute	Partition_coefficient_of_210Pb_Kc	_FillValue	float	NaN
attribute	Partition_coefficient_of_210Pb_Kc	actual_range	float	0.48, 1555.7
attribute	Partition_coefficient_of_210Pb_Kc	bcodmo_name	String	trace_metal_conc
attribute	Partition_coefficient_of_210Pb_Kc	description	String	The partition coefficient of 210Pb between true solution (
attribute	Partition_coefficient_of_210Pb_Kc	long_name	String	Partition Coefficient Of 210 Pb Kc
attribute	Partition_coefficient_of_210Pb_Kc	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	Partition_coefficient_of_210Pb_Kc	units	String	10^4 Liters per Kilogram (L/kg)
variable	err_Kc_Pb		float
attribute	err_Kc_Pb	_FillValue	float	NaN
attribute	err_Kc_Pb	actual_range	float	0.04, 148.08
attribute	err_Kc_Pb	bcodmo_name	String	trace_metal_conc
attribute	err_Kc_Pb	description	String	Error of the partition coefficient of 210Pb between true solution (
attribute	err_Kc_Pb	long_name	String	Err Kc Pb
attribute	err_Kc_Pb	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	err_Kc_Pb	units	String	10^4 Liters per Kilogram (L/kg)
variable	Partition_coefficient_of_7Be_Kc		float
attribute	Partition_coefficient_of_7Be_Kc	_FillValue	float	NaN
attribute	Partition_coefficient_of_7Be_Kc	actual_range	float	0.11, 175.85
attribute	Partition_coefficient_of_7Be_Kc	bcodmo_name	String	trace_metal_conc
attribute	Partition_coefficient_of_7Be_Kc	description	String	The partition coefficient of 7Be between true solution (
attribute	Partition_coefficient_of_7Be_Kc	long_name	String	Partition Coefficient Of 7 Be Kc
attribute	Partition_coefficient_of_7Be_Kc	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	Partition_coefficient_of_7Be_Kc	units	String	10^4 Liters per Kilogram (L/kg)
variable	err_Kc_Be		float
attribute	err_Kc_Be	_FillValue	float	NaN
attribute	err_Kc_Be	actual_range	float	0.03, 16.8
attribute	err_Kc_Be	bcodmo_name	String	trace_metal_conc
attribute	err_Kc_Be	description	String	Error of the partition coefficient of 7Be between true solution (
attribute	err_Kc_Be	long_name	String	Err Kc Be
attribute	err_Kc_Be	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	err_Kc_Be	units	String	10^4 Liters per Kilogram (L/kg)
variable	Partition_coefficient_of_210Po_Kc		float
attribute	Partition_coefficient_of_210Po_Kc	_FillValue	float	NaN
attribute	Partition_coefficient_of_210Po_Kc	actual_range	float	0.42, 22.38
attribute	Partition_coefficient_of_210Po_Kc	bcodmo_name	String	trace_metal_conc
attribute	Partition_coefficient_of_210Po_Kc	description	String	The partition coefficient of 210Po between true solution (
attribute	Partition_coefficient_of_210Po_Kc	long_name	String	Partition Coefficient Of 210 Po Kc
attribute	Partition_coefficient_of_210Po_Kc	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	Partition_coefficient_of_210Po_Kc	units	String	10^4 Liters per Kilogram (L/kg)
variable	err_Kc_Po		float
attribute	err_Kc_Po	_FillValue	float	NaN
attribute	err_Kc_Po	actual_range	float	0.04, 1.51
attribute	err_Kc_Po	bcodmo_name	String	trace_metal_conc
attribute	err_Kc_Po	description	String	Error of the partition coefficient of 210Po between true solution (
attribute	err_Kc_Po	long_name	String	Err Kc Po
attribute	err_Kc_Po	nerc_identifier	String	https://vocab.nerc.ac.uk/collection/P03/current/C035/
attribute	err_Kc_Po	units	String	10^4 Liters per Kilogram (L/kg)

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.