Open AccessAerosol iron and aluminum solubility in the northwest Pacific Ocean: Results from the 2002 IOC cruise
Author(s) -
Buck Clifton S.,
Landing William M.,
Resing Joseph A.,
Lebon Geoffrey T.
Publication year - 2006
Publication title -
geochemistry, geophysics, geosystems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.928
H-Index - 136
ISSN - 1525-2027
DOI - 10.1029/2005gc000977
Subject(s) - aerosol , seawater , ultrapure water , solubility , environmental chemistry , mineral dust , dilution , chemistry , mineralogy , geology , environmental science , oceanography , organic chemistry , environmental engineering , thermodynamics , physics
Dust aerosol samples were collected across the western North Pacific Ocean during May–June 2002. Samples were analyzed for soluble aerosol Fe(II), Fe(II) + Fe(III), and Al as well as major cations and anions. The aerosol samples were leached using a 10 second exposure to either filtered surface seawater or ultrapure deionized water yielding a measure of the “instantaneous” soluble fraction. A variety of analytical methods were employed, including 57 Fe isotope dilution high‐resolution ICP‐MS, energy dispersive X‐ray fluorescence, graphite furnace AAS, ion chromatography, and the FeLume chemiluminescent technique. Fe was found to be more soluble in ultrapure deionized water leaches, especially during periods of higher dust concentrations. Fe solubility averaged 9 ± 8% in ultrapure water leaches and 6 ± 5% in seawater leaches. Significant correlations were found between both soluble aerosol Fe T and soluble Fe(II) concentrations and aerosol acidity; however, the percentages of soluble aerosol Fe T and Fe(II) did not correlate with aerosol acidity We also did not observe significant correlations between total and soluble aerosol Fe concentrations and the concentrations of either particulate Fe or dissolved Fe in surface waters.