Segregation of NaBr in NaBr/NaCl crystals grown from aqueous solutions: Implications for sea salt surface chemistry

C. D. Zangmeister, A. T. Jessica, Jeanne E Pemberton

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Surface segregation of NaBr in mixed NaBr/NaCl crystals precipitated from aqueous solutions containing Br is investigated. Crystals were grown from solutions of a wide range of Br:Cl values and studied using x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive x-ray flourescence (EDX), and atomic force microscopy (AFM). Results indicates that NaBr surface-segregates to cover 4-5% of the surface at the Br:Cl value found in Sea water (1:660). The surface NaBr:NaCl values are ~ 35 times higher those of the bulk crystals. The surface NaBr forms domains of average size 635 nm x 635 nm x 53 nm. Large areas of the surface contain NaCl with no detectable NaBr. Complete surface segregation of all Br found in sea salt particles is likely to occur, thereby making a greater amount of Br available for surface reactions with gas-phase constituents than would be predicted based on bulk composition.

Original languageEnglish (US)
Pages (from-to)995-998
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number6
DOIs
StatePublished - Mar 15 2001
Externally publishedYes

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sea salt
aqueous solution
chemistry
crystal
aqueous solutions
salts
crystals
sea water
atomic force microscopy
surface reactions
x ray spectroscopy
photoelectron spectroscopy
vapor phases
scanning electron microscopy
spectroscopy
seawater
gas
x rays
energy

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Segregation of NaBr in NaBr/NaCl crystals grown from aqueous solutions : Implications for sea salt surface chemistry. / Zangmeister, C. D.; Jessica, A. T.; Pemberton, Jeanne E.

In: Geophysical Research Letters, Vol. 28, No. 6, 15.03.2001, p. 995-998.

Research output: Contribution to journalArticle

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AB - Surface segregation of NaBr in mixed NaBr/NaCl crystals precipitated from aqueous solutions containing Br is investigated. Crystals were grown from solutions of a wide range of Br:Cl values and studied using x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive x-ray flourescence (EDX), and atomic force microscopy (AFM). Results indicates that NaBr surface-segregates to cover 4-5% of the surface at the Br:Cl value found in Sea water (1:660). The surface NaBr:NaCl values are ~ 35 times higher those of the bulk crystals. The surface NaBr forms domains of average size 635 nm x 635 nm x 53 nm. Large areas of the surface contain NaCl with no detectable NaBr. Complete surface segregation of all Br found in sea salt particles is likely to occur, thereby making a greater amount of Br available for surface reactions with gas-phase constituents than would be predicted based on bulk composition.

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