Dataset: GN01 As Total Particulate

Name: Total Particulate Arsenic depth profiles from the US GEOTRACES Arctic cruise (HLY1502, GN01) from August to October 2015
Published: 2019-10-11
Keywords: oceans

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Cite This Dataset

Project:

GEOTRACES Arctic Section: Processes affecting the biogeochemical cycling of essential and toxic metalloids in the Arctic Ocean (GEOTRACES Arctic Arsenic and Selenium)

U.S. Arctic GEOTRACES Study (GN01) (U.S. GEOTRACES Arctic)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

Gregory A. Cutter (Old Dominion University, ODU)

BCO-DMO Data Manager:

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

Version:

Version Date:

2019-10-11

Restricted:

Validated:

Current State:

Preliminary and in progress

Total Particulate Arsenic depth profiles from the US GEOTRACES Arctic cruise (HLY1502, GN01) from August to October 2015

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Description

Data have been submitted to BCO-DMO and are currently being processed (2019-10-11).

Methods & Sampling

Particulate samples were collected using McLane in situ pumps (P. Lam, UCSC) at various depths (Bishop et al., 2012), with splits (ca. 1/16 section) from a 0.8 µm Supor filter processed and immediately frozen for storage and return to the ODU Lab. The volume of water that passed through each filter was recorded by the pumps.

Water column particulate filters were solubilized using the nitric-perchloric acid reflux digestion procedure described by Cutter (1985) but using a microwave digestion unit. The digestion solutions were analyzed using selective hydride generation, liquid nitrogen-cooled trapping, and then revolatilization and determination with gas chromatography/photoionization detection (Cutter et al., 1991). Calibration performed daily via the standard additions method, with a minimum of 4 additions of AsV. The slope from the linear fit to these data was then applied to all samples for that day. The detection limit for total particulate As, assuming an average filtration volume of 24 liters, was 0.0001 nmol/L (3s, n=24), with an accuracy of 87±14 % recovery of the BCR 277R estuarine sediment standard reference material and a precision of 10.5% (RSD) at 0.0001 nmol/L.

Data Processing Description

Only one filter was digested per depth, but the digestion solutions were analyzed in triplicate and means computed. Standard additions of arsenate were used for daily calibration on a representative sample and its slope applied to subsequent samples.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1435708

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
HLY1502	GN01 U.S. GEOTRACES Arctic 32H120150809	2015-08-09	USCGC Healy	David C. Kadko (Chief Scientist) William M. Landing (Co-Chief Scientist)	data info

Instruments

McLane Pump

Supplied Name: McLane in situ pumps

Supplied Description:

Instrument Type

Generic Name: McLane Pump

Generic Description:

McLane pumps sample large volumes of seawater at depth. They are attached to a wire and lowered to different depths in the ocean. As the water is pumped through the filter, particles suspended in the ocean are collected on the filters. The pumps are then retrieved and the contents of the filters are analyzed in a lab.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
GEOTRC_SAMPNO	GEOTRACES sample number	unitless	sample
STNNBR	Station number	unitless	station
GEOTRC_CASTNO	Station number	unitless	station
DEPTH	Sample depth	meters	depth
GEOTRC_EVENTNO	GEOTRACES event number	unitless	event
As_TP_CONC_BOTTLE	Total particulate arsenic	nanomoles per liter(nmol/L)	trace_metal_conc

Status message

Database

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Dataset: GN01 As Total Particulate