Dataset: cal_iso

Name: Calibration of the Isotope Ratio Mass Spectrometer vs. aliquots of 15N2 gas diluted in air then helium
Published: 2019-10-02
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.778000.1

Project:

EAGER: Collaborative Research: Detection limit in marine nitrogen fixation measurements - Constraints of rates from the mesopelagic ocean (EAGER NitFix)

Principal Investigator:

Julie Granger (University of Connecticut, UConn)

Co-Principal Investigator:

Annie Bourbonnais (University of Massachusetts Dartmouth, UMass Dartmouth)

Samuel Wilson (University of Hawaii)

BCO-DMO Data Manager:

Mathew Biddle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2019-10-02

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset/778000/data

Calibration of the Isotope Ratio Mass Spectrometer vs. aliquots of 15N2 gas diluted in air then helium

Abstract:

In order to verify that measurements of the 15N2 atom% of dissolved N2 gas samples effectuated by Membrane Inlet Mass Spectrometry are accurate, we compared these to corresponding measurements of parallel samples on a Delta V Isotope Ratio Mass Spectrometer (IRMS). To this end, we first ensured that the IRMS returns accurate 15N2 atom% values, by measuring the 15N2 atom% of a serial dilutions of a 15N2 gas stock in air and helium. This calibration is documented herein, showing that IRMS measurements in the experimental range were accurate, as expected

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2019-10-02	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.778000.1	2020-01-06

Description

Measurements of the 15N2 atom % in prepared standards and solutions.

Acquisition Description

A serial dilution of 98-99% 15N2 gas stock (Cambridge Isotope Laboratories, Lot #I-21065) in air and helium returned the expected signal (i.e., a slope not significantly different than unity) on a continuous flow Delta V Advantage Plus IRMS (Smith et al. 2015), demonstrating the accuracy of the IRMS over a wide range of 15N2 abundances.

Processing Description

BCO-DMO Processing Notes:
- table was extracted from original spreadsheet.
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1732246

Deployments

None available yet

Instruments

Isotope-ratio Mass Spectrometer

Supplied Name: Isotope Ratio Mass Spectrometer

Supplied Description:

continuous flow Delta V Isotope Ratio Mass Spectrometer (Smith et al. 2015), and continuous flow-GV Isoprime IRMS (Charoenpong et al., 2014)

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/

Generic Description:

The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).

Membrane Inlet Mass Spectrometer

Supplied Description:

Membrane Inlet Mass Spectrometer (Bay Instruments)

Instrument Type

Generic Name: Membrane Inlet Mass Spectrometer

Acronym: MIMS

Generic Description:

Membrane-introduction mass spectrometry (MIMS) is a method of introducing analytes into the mass spectrometer's vacuum chamber via a semipermeable membrane.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
comment	sample type	unitless	comment
expected	Expceted 15N2 air He dil (m/z 30/28 ratio x 100)	unitless	unknown
measured	measured m/z 30/28 ratio x 100 on GC-IRMS	unitless	unknown

Database

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