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. Froth flotation is a commonly used procedure forseparating feldspars and micas from quartz for the preparation of quartzmineral separates to carry out cosmogenic nuclide analysis. Whilstextracting carbon from quartz we observed in situ carbon-14 ( 14C )concentrations which were anomalously high and in excess of theoreticalgeological maximum concentrations. Further etching of sample materialreduced carbon yields and 14C concentrations, yet the latter remainedunrealistically high. When quartz from the original whole rock sample wasisolated in our laboratory, we observed even lower carbon yields andgeologically plausible in situ 14C concentrations. After ruling outunlikely geological scenarios and systematic measurement issues, we decidedto investigate the quartz isolation procedure as a potential source of 14C contamination. We hypothesised that laurylamine (dodecylamine), anorganic compound used as part of the froth flotation procedure, elevates 14C concentrations if residual laurylamine is present. We demonstratethat laurylamine has a 14C modern carbon source and thus has thepotential to influence in situ 14C measurements if present in minutebut measurable quantities. Furthermore, we show that insufficient sampleetching results in contaminant 14C persisting through the step heating ofquartz that is subsequently collected with the in situ component released at1100  ∘ C. We demonstrate that froth flotation contaminates in situ 14C measurements. We provide guidelines for the preparation of quartzbased on methods developed in our laboratory and demonstrate that all froth-flotation-derived carbon and 14C is removed when applied. We recommendthat the procedures presented be used at a minimum when using frothflotation to isolate quartz for in situ 14C measurements.

Isolation of quartz for cosmogenic in situ &lt;sup&gt;14&lt;/sup&gt;C analysis

Isolation of quartz for cosmogenic in situ <sup>14</sup>C analysis