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University of Wisconsin Radiocarbon Dates XX

Published online by Cambridge University Press:  18 July 2016

Raymond L Steventon
Affiliation:
Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin-Madison, 1225 West Dayton Street, Madison, Wisconsin 53706
John E Kutzbach
Affiliation:
Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin-Madison, 1225 West Dayton Street, Madison, Wisconsin 53706
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Procedures and equipment have been described in previous date lists. Except as otherwise indicated, wood, charcoal, and peat samples are pretreated with dilute NaOH–Na4P2O7 and dilute H3PO4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4. Pretreatment of bone varies with the condition of the bone sample; solid bone with little deterioration is first cleaned manually and ultrasonically. The bone is treated with 8% HCl for 15 minutes, then dilute NaOH–Na4P2O7 for 3 hours at room temperature, washed until neutral, and the collagen extracted according to Longin (1971). Charred bone is treated with dilute HCl, NaOH–Na4P2O7, and then dilute HCl again.

Type
Research Article
Copyright
Copyright © The American Journal of Science 

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