Dataset: GP15 Inert Copper and Iodine Redox Speciation Leg 1
Deployment: RR1814

GP15 Inert Copper and Iodine Redox Speciation Leg 1

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/873183

Principal Investigator:

James W. Moffett (University of Southern California, USC)

Contact:

Rintaro Moriyasu (University of Southern California, USC)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. GEOTRACES PMT: Measurement of the organic complexation and chemical lability of dissolved copper using multiple techniques (PMT Copper)

US GEOTRACES Pacific Meridional Transect (GP15) (U.S. GEOTRACES PMT)

Deployment Synonyms:

GP15, GP15 Leg1, 33RR20180918, PMT, US GEOTRACES PMT

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Description

Methods & Sampling

Dataset acquisition description

Iodate and Iodide were measured along the GEOTRACES GP15 transect aboard R/V Roger Revelle. Samples were collected using the GEOTRACES trace-metal clean rosette. For the purposes of preserving the speciation, all samples were immediately frozen at -20 °C and shipped back to the United States in a cooler, overnight. The samples were kept frozen until analysis, at which point, they were defrosted. Iodate was analyzed on UV-Vis Spectrophotometer while Iodide was analyzed on the Hanging Mercury Drop Electrode with the Cathodic Square Wave Stripping Voltammetry setting. Both methods were described previously in Moriyasu et al., (2020). Inert copper was determined by ligand exchange solvent extraction (Moriyasu & Moffett, 2022).

Data Processing Description

Dataset Processing Description

Data Quality Flags:
The data quality flags of 1 indicate "good" data.

BCO-DMO Processing:
version 1 (2022-04-20):
- renamed fields to comply with BCO-DMO naming conventions;
- created date-time columns in ISO8601 format.
version 2 (2022-12-28):
- added the inert copper columns to the dataset;
- rounded SD1_L1Cu_D_CONC_BOTTLE_ypaxln column to decimal places.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1756415	NSF Division of Ocean Sciences

Instruments

BASi Controlled Growth Mercury Electrode

Supplied Name: BASi Controlled Growth Mercury Electrode (CGME)

Supplied Description:

Iodide analyses were done on the BASi Controlled Growth Mercury Electrode (CGME) stand with a Calomel reference electrode and platinum wire auxiliary electrode.

Instrument Type

Generic Name: BASi Controlled Growth Mercury Electrode

Acronym: BASI CGME

Generic Description:

Bioanalytical Systems (BASi) Mercury drop electrodes are generated by the BASi Controlled Growth Mercury Electrode (CGME) in three modes:

DME (Dropping Mercury Electrode) - mercury is allowed to flow freely from the reservoir down the capillary and so the growth of the mercury drop and its lifetime is controlled by gravity. (The optional 100 um capillary is recommended for this mode.)

SMDE (Static Mercury Drop Electrode) - the drop size is determined by the length of time for which the fast-response capillary valve is opened, and the drop is dislodged by a drop knocker. The dispense/knock timing is microprocessor-controlled and is typically coordinated with the potential pulse or square-wave waveform. This mode can also used to generate the Hanging Mercury Drop Electrode required for stripping experiments.

CGME (Controlled Growth Mercury Electrode) - the mercury drop is grown by a series of pulses that open the capillary valve. The number of pulses, their duration, and their frequency can be varied by PC control, providing great flexibility in both the drop size and its rate of growth. This CGME mode can be used for both polarographic and stripping experiments.

http://www.basinc.com/products/ec/cgme.php

GO-FLO Teflon Trace Metal Bottle

Supplied Name: trace-metal clean rosette

Supplied Description:

Samples were collected using the GEOTRACES trace-metal clean rosette.

Instrument Type

Generic Name: GO-FLO Teflon Trace Metal Bottle

Acronym: GO-FLO Teflon TM

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/30/

Generic Description:

GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Inductively Coupled Plasma Mass Spectrometer

Supplied Name: ICPMS

Supplied Description:

Copper analyses were performed by ICPMS with isotope dilution after a ligand competition solvent extraction assay.

Instrument Type

Generic Name: Inductively Coupled Plasma Mass Spectrometer

Acronym: ICP Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/

Generic 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.

Perkin Elmer Lambda 35 Spectrophotometer

Supplied Name: Perkin Elmer Lambda 35

Supplied Description:

Iodate analyses were done on the Perkin Elmer Lambda 35 using a 10 cm quartz cuvette.

Instrument Type

Generic Name: Perkin Elmer Lambda 35 Spectrophotometer

Acronym: Perkin Elmer Lambda 35

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

The Lambda 35 is a double beam UV/Vis spectrophotometer from Perkin Elmer, packing pre-aligned Tungsten and Deuterium Lamps. It has a wavelength range of 190-1100nm and a variable bandwidth range of 0.5 to 4nm.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Station_ID	Station number	unitless	station
Start_Date_UTC	Sampling start date	unitless	date
Start_Time_UTC	Sampling start time (UTC)	unitless	time
Start_ISO_DateTime_UTC	Sampling start date and time (UTC) in ISO8601	unitless	ISO_DateTime_UTC
End_Date_UTC	Sampling end date	unitless	date
End_Time_UTC	Sampling end time (UTC)	unitless	time
End_ISO_DateTime_UTC	Sampling end date and time (UTC) in ISO8601	unitless	ISO_DateTime_UTC
Start_Latitude	Latitude at start of sample collection	decimal degrees North	lat
Start_Longitude	Longitude at start of sample collection	decimal degrees East	lon
End_Latitude	Latitude at end of sample collection	decimal degrees North	lat
End_Longitude	Longitude at end of sample collection	decimal degrees East	lon
Cast_number	Cast number	unitless	cast
Event_ID	Event number	unitless	event
Sample_ID	GEOTRACES sample ID number	unitless	sample
Sample_Depth	Sample depth	meters (m)	depth
L1Cu_D_CONC_BOTTLE_ypaxln	Concentration of dissolved inert copper. We designated inert Cu as CuL1 in the dataset. This is primarily to conform with previous data sets. L1 is an operationally defined parameter that includes strong copper chelators having a conditional stability constant of logK > 12. In our work, the conditional stability constant of inert Cu has a lower limit of log K = 17. The units are in nM per kg	nanomoles per kilogram (nmol/kg)	Cu
SD1_L1Cu_D_CONC_BOTTLE_ypaxln	Standard deviation of L1Cu_D_CONC_BOTTLE_ypaxln	nanomoles per kilogram (nmol/kg)	Cu
Flag_L1Cu_D_CONC_BOTTLE_ypaxln	Data quality flag for L1Cu_D_CONC_BOTTLE_ypaxln	unitless	q_flag
I_neg1_D_CONC_BOTTLE_byhuiw	Concentration of dissolved Iodide, iodine in the -I oxidation state	nanomoles per liter (nmol/L)	iodide
SD1_I_neg1_D_CONC_BOTTLE_byhuiw	Standard deviation of I_neg1_D_CONC_BOTTLE_byhuiw	nanomoles per liter (nmol/L)	iodide
Flag_I_neg1_D_CONC_BOTTLE_byhuiw	Data quality flag for I_neg1_D_CONC_BOTTLE_byhuiw (1 = good data)	unitless	q_flag
I_V_D_CONC_BOTTLE_qlcfpy	Concentration of dissolved Iodate, iodine in the V oxidation state	nanomoles per liter (nmol/L)	iodate
SD1_I_V_D_CONC_BOTTLE_qlcfpy	Standard deviation of I_V_D_CONC_BOTTLE_qlcfpy	nanomoles per liter (nmol/L)	iodate
Flag_I_V_D_CONC_BOTTLE_qlcfpy	Data quality flag for I_V_D_CONC_BOTTLE_qlcfpy (1 = good data)	unitless	q_flag

Database

Contribute Data

Dataset: GP15 Inert Copper and Iodine Redox Speciation Leg 1
Deployment: RR1814

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: GP15 Inert Copper and Iodine Redox Speciation Leg 1Deployment: RR1814

Dataset acquisition description

Dataset Processing Description

Dataset: GP15 Inert Copper and Iodine Redox Speciation Leg 1
Deployment: RR1814