Dataset: mims_to_irms

Name: Comparison of Membrane Inlet Mass Spectrometry (MIMS) to Isotope Ratio Mass Spectrometer (IRMS)
Published: 2019-10-02
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.778065.1

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, 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

Comparison of Membrane Inlet Mass Spectrometry (MIMS) to Isotope Ratio Mass Spectrometer (IRMS)

Abstract:

In order to ensure that 15N2 atom% effectuated by Membrane Inlet Mass Spectrometry, we tested whether the mass-specific signal ratios returned by MIMS are equivalent with parallel measurements on a Isotope Ratio Mass Spectrometer, on the basis that the latter returns accurate ratios (see 778000 cal_iso). MIMS and IRMS returned identical values for parallel samples.

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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.778065.1	2020-01-06

Description

Comparison of MIMS to IRMS

Methods & Sampling

We tested whether the mass-specific signal ratios returned by MIMS accurately quantitate the relative isotopic abundance of 15N2 in the range typically used for N2 fixation incubations. Incremental 15N2 gas aliquots were equilibrated in seawater, and respective solutions were then dispensed into replicate gas-tight vials. 15N atom % of dissolved N2 values were measured in parallel by continuous flow IRMS on a GV Isoprime IRMS (Charoenpong et al., 2014) and by MIMS (Bay Instruments), on the assumption that values returned by IRMS are accurate.

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
mims_2_irms.csv (Comma Separated Values (.csv), 465 bytes) MD5:7b8dbeb0ef6ce3be753fead18af7c9e9 Primary data file for dataset ID 778065

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
Subsample	subsample identification	unitless	sample
MIMS_at_pcnt	MIMS at%	unitless	no_bcodmo_term
stdev_MIMS_at_pcnt	stdev MIMS at%	unitless	no_bcodmo_term
IRMS_15N_at_pcnt	IRMS 15N at%	unitless	no_bcodmo_term
stdev_IRMS_15N_at_pcnt	stdev IRMS 15N at%	unitless	no_bcodmo_term
IRMS_at_pcnt_no_furnace	IRMS at% no furnace	unitless	no_bcodmo_term
stdev_IRMS_at_pcnt_no_furnace	stdev IRMS at% no furnace	unitless	no_bcodmo_term

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Dataset: mims_to_irms

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Dataset: mims_to_irms

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