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Issue 22, 2019
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Graphite oxidation chemistry is relevant for designing cleaning strategies for radiocarbon dating samples

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Abstract

We demonstrate that mixtures of graphite and lab-oxidized graphenic carbon materials can be separated into three individual components (graphite, graphene/graphite oxide (GO) and oxidative debris (OD)) by a series of aqueous treatments. Our results show that a key part of this separation procedure involves a water treatment and sonication near neutral pH in order to separate GO from OD. We show that the relative proportions of OD and GO – independent of any humic substances – can affect the ability of oxidized graphite to be suspended in water, which can influence the efficiency of the separation procedures we describe. We compare and contrast our protocol with others that are widely used for cleaning archaeological charcoal prior to radiocarbon dating. Our protocol has potential applications for tailored cleaning procedures for graphenic carbon materials, including the possibility of separating GO from both OD and graphite, for radiocarbon dating purposes.

Graphical abstract: Graphite oxidation chemistry is relevant for designing cleaning strategies for radiocarbon dating samples

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Article information


Submitted
07 Jan 2019
Accepted
07 May 2019
First published
08 May 2019

Anal. Methods, 2019,11, 2880-2887
Article type
Paper

Graphite oxidation chemistry is relevant for designing cleaning strategies for radiocarbon dating samples

A. Joorab Doozha and Kristin M. Poduska, Anal. Methods, 2019, 11, 2880
DOI: 10.1039/C9AY00046A

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