The effect of changes in relative humidity on the hydration rate of Pachuca obsidian

Lawrence M. Anovitz; Lee R. Riciputi; David R. Cole; Miroslaw S. Gruszkiewicz; J. Michael Elam

doi:10.1016/j.jnoncrysol.2006.08.044

The effect of changes in relative humidity on the hydration rate of Pachuca obsidian

Lawrence M. Anovitz, Lee R. Riciputi, David R. Cole, Miroslaw S. Gruszkiewicz, J. Michael Elam

Geochemistry & Interfacial Science

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The effect of relative humidity on the hydration rate of obsidian and other glasses has been debated since the early work of [I. Friedman, R. Smith, Am. Antiquity 25 (1960) 476]. While more recent work has been in general agreement that a relative humidity dependence does exist, hydration profiles as a function of relative humidity have not been obtained. In this paper we present the results of a study in which samples of Pachuca obsidian were hydrated for approximately 5 days at 150 °C at relative humidities ranging from 21% to 100%, and the resultant profiles were measured by secondary ion mass spectrometry (SIMS). The results suggest that the hydration rate is, indeed, a function of relative humidity, but for the relative humidity levels commonly observed in most soils the effects on hydration dating are expected to be relatively small. In addition, analysis of the surface values as sorption isotherms and comparisons with nitrogen sorption isotherms suggests that water is relatively strongly bound to the obsidian surface. By assuming a situation in which the 'surface' refers to active centers within the glass we have shown that an adsorption model provides a useful approach to modeling the diffusive process.

Original language	English
Pages (from-to)	5652-5662
Number of pages	11
Journal	Journal of Non-Crystalline Solids
Volume	352
Issue number	52-54
DOIs	https://doi.org/10.1016/j.jnoncrysol.2006.08.044
State	Published - Dec 15 2006

Funding

Research sponsored by the Archaeometry Program, National Science Foundation grant numbers SBR-98-04350, and BCS-0108956, and by the Division of Chemical Sciences, Geosciences and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725, Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. The authors would also like to thank Drs James S. Bogard, Juske Horita, Donald A. Palmer, Edmund Perfect and David J. Wesolowski, all of whom helped us to acquire some of the experimental equipment needed for this project and provided useful technical advice.

Funders	Funder number
National Science Foundation	SBR-98-04350, BCS-0108956
U.S. Department of Energy	DE-AC05-00OR22725
Basic Energy Sciences
Oak Ridge National Laboratory
Chemical Sciences, Geosciences, and Biosciences Division

Keywords

Archaeology
Diffusion and transport
Geology
Geology and archeology
Hydration
Hydrogen in glass
Natural glasses
Oxide glasses
Secondary ion mass spectrocopy
Silicates
Water
Water in glass

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10.1016/j.jnoncrysol.2006.08.044

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title = "The effect of changes in relative humidity on the hydration rate of Pachuca obsidian",

abstract = "The effect of relative humidity on the hydration rate of obsidian and other glasses has been debated since the early work of [I. Friedman, R. Smith, Am. Antiquity 25 (1960) 476]. While more recent work has been in general agreement that a relative humidity dependence does exist, hydration profiles as a function of relative humidity have not been obtained. In this paper we present the results of a study in which samples of Pachuca obsidian were hydrated for approximately 5 days at 150 °C at relative humidities ranging from 21% to 100%, and the resultant profiles were measured by secondary ion mass spectrometry (SIMS). The results suggest that the hydration rate is, indeed, a function of relative humidity, but for the relative humidity levels commonly observed in most soils the effects on hydration dating are expected to be relatively small. In addition, analysis of the surface values as sorption isotherms and comparisons with nitrogen sorption isotherms suggests that water is relatively strongly bound to the obsidian surface. By assuming a situation in which the 'surface' refers to active centers within the glass we have shown that an adsorption model provides a useful approach to modeling the diffusive process.",

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AU - Michael Elam, J.

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The effect of changes in relative humidity on the hydration rate of Pachuca obsidian

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