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Aldehydes in hydrothermal solution - Standard partial molal thermodynamic properties and relative stabilities at high temperatures and pressuresAldehydes are common in a variety of geologic environments and are derived from a number of sources, both natural and anthropogenic. Experimental data for aqueous aldehydes were taken from the literature and used, along with parameters for the revised Helgeson-Kirkham-Flowers (HKF) equations of state, to estimate standard partial molal thermodynamic data for aqueous straight-chain alkyl aldehydes at high temperatures and pressures. Examples of calculations involving aldehydes in geological environments are given, and the stability of aldehydes relative to carboxylic acids is evaluated. These calculations indicate that aldehydes may be intermediates in the formation of carboxylic acids from hydrocarbons in sedimentary basin brines and hydrothermal systems like they are in the atmosphere. The data and parameters summarized here allow evaluation of the role of aldehydes in the formation of prebiotic precursors, such as amino acids and hydroxy acids on the early Earth and in carbonaceous chondrite parent bodies.
Document ID
19940033471
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schulte, Mitchell D.
(NASA Headquarters Washington, DC United States)
Shock, Everett L.
(Washington Univ. Saint Louis, MO, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 57
Issue: 16
ISSN: 0016-7037
Subject Category
Space Biology
Accession Number
94A10126
Funding Number(s)
CONTRACT_GRANT: NAGW-2818
Distribution Limits
Public
Copyright
Other

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