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A Chemical Ionization Mass Spectrometer for Continuous Underway Shipboard Analysis of Dimethylsulfide in Near-surface Seawater : Volume 6, Issue 2 (16/07/2009)

By Saltzman, E. S.

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Book Id: WPLBN0004021056
Format Type: PDF Article :
File Size: Pages 26
Reproduction Date: 2015

Title: A Chemical Ionization Mass Spectrometer for Continuous Underway Shipboard Analysis of Dimethylsulfide in Near-surface Seawater : Volume 6, Issue 2 (16/07/2009)  
Author: Saltzman, E. S.
Volume: Vol. 6, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Lawler, M. J., Marandino, C. A., Mccormick, C. A., Saltzman, E. S., & De Bruyn, W. J. (2009). A Chemical Ionization Mass Spectrometer for Continuous Underway Shipboard Analysis of Dimethylsulfide in Near-surface Seawater : Volume 6, Issue 2 (16/07/2009). Retrieved from

Description: University of California, Irvine, Irvine, California, USA. A compact, low-cost atmospheric pressure, chemical ionization mass spectrometer (mini-CIMS) has been developed for continuous underway shipboard measurements of dimethylsulfide (DMS) in seawater. The instrument was used to analyze DMS in air equilibrated with flowing seawater across a porous Teflon membrane equilibrator. The equilibrated gas stream was diluted with air containing an isotopically-labeled internal standard. DMS is ionized at atmospheric pressure via proton transfer from water vapor, then declustered, mass filtered via quadrupole mass spectrometry, and detected with an electron multiplier. The instrument described here is based on a low-cost residual gas analyzer (Stanford Research Systems), which has been modified for use as a chemical ionization mass spectrometer. The mini-CIMS has a gas phase detection limit of 170 ppt DMS for a 1 min averaging time, which is roughly equivalent to a seawater DMS concentration of 0.1 nM DMS at 20°C. The mini-CIMS has the sensitivity, selectivity, and time response required for underway measurements of surface ocean DMS over the full range of oceanographic conditions. The simple, robust design and relatively low cost of the instrument are intended to facilitate use in process studies and surveys, with potential for long-term deployment on research vessels, ships of opportunity, and large buoys.

A chemical ionization mass spectrometer for continuous underway shipboard analysis of dimethylsulfide in near-surface seawater

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