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 Hawai'i, UH)

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

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 (PID)	Date PID Issued
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.

Methods & Sampling

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.

Data 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

Data Files

File
cal_iso.csv (Comma Separated Values (.csv), 121 bytes) MD5:99d30eb086b4f8d16be291013b0442eb Primary data file for dataset ID 778000

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; IRMS

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

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

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	no_bcodmo_term
measured	measured m/z 30/28 ratio x 100 on GC-IRMS	unitless	no_bcodmo_term

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