Dissolution of aerosol iron in the surface waters of the North Pacific and North Atlantic oceans as determined by a semicontinuous flow-through reactor method

Jingfeng Wu, Robert Rember, Cathy Cahill

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Aerosol iron dissolution in oceanic waters is determined with a semicontinuous batch-leaching method. In this procedure, aerosol samples that were collected from the marine boundary layer were leached in an all-Teflon flow-through reaction chamber by multiple aliquots of ∼40 mL 0.4 μm filtered oceanic surface water collected using ultraclean techniques. Each aliquot of seawater is permitted to leach the aerosol sample in the reaction chamber for a predetermined time before the seawater solution is separated from the aerosol sample by a 0.4 μm Nucleopore filter membrane. A new aliquot of seawater is then added to the leaching chamber to continue leaching the same aerosol particles retained on the filter. The procedure is repeated with progressive increases in leaching time. The method allows the Fe released from the aerosol particles to be continuously removed from the system before saturating the complexation capacity of the seawater-leaching solution or adsorbing onto the leaching chamber wall. This method results in accurate measurements of seawater-dissolvable labile aerosol Fe that is independent of the total aerosol Fe concentrations in the sample. The aerosol Fe solubility determined using this method ranges from 3.5 ± 1.5% for the North Atlantic during September 2005 to 5.7 ± 2.0% for the North Pacific during April 2005 and April 2006.

Original languageEnglish (US)
Article numberGB4010
JournalGlobal Biogeochemical Cycles
Volume21
Issue number4
DOIs
StatePublished - Dec 2007
Externally publishedYes

Fingerprint

Aerosols
Surface waters
Dissolution
Iron
dissolution
aerosol
surface water
iron
Leaching
Seawater
leaching
seawater
filter
reactor
North Atlantic Ocean
method
Polytetrafluoroethylene
Complexation
complexation
Boundary layers

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Global and Planetary Change

Cite this

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title = "Dissolution of aerosol iron in the surface waters of the North Pacific and North Atlantic oceans as determined by a semicontinuous flow-through reactor method",
abstract = "Aerosol iron dissolution in oceanic waters is determined with a semicontinuous batch-leaching method. In this procedure, aerosol samples that were collected from the marine boundary layer were leached in an all-Teflon flow-through reaction chamber by multiple aliquots of ∼40 mL 0.4 μm filtered oceanic surface water collected using ultraclean techniques. Each aliquot of seawater is permitted to leach the aerosol sample in the reaction chamber for a predetermined time before the seawater solution is separated from the aerosol sample by a 0.4 μm Nucleopore filter membrane. A new aliquot of seawater is then added to the leaching chamber to continue leaching the same aerosol particles retained on the filter. The procedure is repeated with progressive increases in leaching time. The method allows the Fe released from the aerosol particles to be continuously removed from the system before saturating the complexation capacity of the seawater-leaching solution or adsorbing onto the leaching chamber wall. This method results in accurate measurements of seawater-dissolvable labile aerosol Fe that is independent of the total aerosol Fe concentrations in the sample. The aerosol Fe solubility determined using this method ranges from 3.5 ± 1.5{\%} for the North Atlantic during September 2005 to 5.7 ± 2.0{\%} for the North Pacific during April 2005 and April 2006.",
author = "Jingfeng Wu and Robert Rember and Cathy Cahill",
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AB - Aerosol iron dissolution in oceanic waters is determined with a semicontinuous batch-leaching method. In this procedure, aerosol samples that were collected from the marine boundary layer were leached in an all-Teflon flow-through reaction chamber by multiple aliquots of ∼40 mL 0.4 μm filtered oceanic surface water collected using ultraclean techniques. Each aliquot of seawater is permitted to leach the aerosol sample in the reaction chamber for a predetermined time before the seawater solution is separated from the aerosol sample by a 0.4 μm Nucleopore filter membrane. A new aliquot of seawater is then added to the leaching chamber to continue leaching the same aerosol particles retained on the filter. The procedure is repeated with progressive increases in leaching time. The method allows the Fe released from the aerosol particles to be continuously removed from the system before saturating the complexation capacity of the seawater-leaching solution or adsorbing onto the leaching chamber wall. This method results in accurate measurements of seawater-dissolvable labile aerosol Fe that is independent of the total aerosol Fe concentrations in the sample. The aerosol Fe solubility determined using this method ranges from 3.5 ± 1.5% for the North Atlantic during September 2005 to 5.7 ± 2.0% for the North Pacific during April 2005 and April 2006.

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