High-frequency measurement of partial pressure and total concentration of carbon dioxide in seawater using microporous hydrophobic membrane contractors Public Deposited

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  • To investigate CO₂ chemistry in ocean water with greater time-space resolutions, we developed measurement systems, which have state-of-the-art precision but an order of magnitude or better increase in the frequency of analysis, for carbon dioxide partial pressures (Pco₂) and total carbon dioxide concentrations (Tco₂) in seawater. The Pco₂ system was based on equilibration of a CO₂-free carrier gas stream with aqueous carbon dioxide in a flowing seawater sample stream using a commercially available membrane contactor unit normally employed in industrial applications followed by nondispersive infrared (NDIR) absorbance detection of the CO₂ in the exit carrier gas. The Tco₂ system was based on injection of a small-volume seawater sample loop (~1 mL) into an acid (0.1 N HCl) liquid carrier stream to convert all carbonate and bicarbonate ions to aqueous carbon dioxide; this acidified sample was then passed through a custom-made small-volume membrane contactor unit where the sample’s Pco₂ was determined by equilibration of a CO₂-free carrier gas followed by NDIR detection. Results from lab tests and a field experiment in the Ross Sea polynya, Antarctica, are presented. The Pco₂ system was determined to have a response time of about 3 s and precision of better than 1 μatm. The Tco₂ system had a maximum analysis rate of one sample per 36 s, and reproducibility was determined to be better than 0.2% for a period of hours.
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  • Hales, B., Chipman, D., & Takahashi, T. (2004). High-frequency measurement of partial pressure and total concentration of carbon dioxide in seawater using microporous hydrophobic membrane contractors [Electronic version]. Limnology and Oceanography: Methods, 2, 356-364.
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  • description.provenance : Approved for entry into archive by Sue Kunda(sue.kunda@oregonstate.edu) on 2010-07-10T00:19:47Z (GMT) No. of bitstreams: 1 Hales_et_al_Limnol_Oceanogr_Methods_2004.pdf: 2967065 bytes, checksum: 5d6755615afed2627619caf784fd4256 (MD5)
  • description.provenance : Made available in DSpace on 2010-07-10T00:19:47Z (GMT). No. of bitstreams: 1 Hales_et_al_Limnol_Oceanogr_Methods_2004.pdf: 2967065 bytes, checksum: 5d6755615afed2627619caf784fd4256 (MD5) Previous issue date: 2004-11
  • Limnology and Oceanography: Methods
  • description.provenance : Submitted by David Moynihan (dmscanner@gmail.com) on 2010-07-08T18:32:29Z No. of bitstreams: 1 Hales_et_al_Limnol_Oceanogr_Methods_2004.pdf: 2967065 bytes, checksum: 5d6755615afed2627619caf784fd4256 (MD5)
  • Vol. 2 (2004)

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