Acid digestion on river influenced shelf sediment organic matter: Carbon and nitrogen contents and isotopic ratios - Université de Bretagne Occidentale Access content directly
Journal Articles Rapid Communications in Mass Spectrometry Year : 2018

Acid digestion on river influenced shelf sediment organic matter: Carbon and nitrogen contents and isotopic ratios

Virgil Pasquier
Pierre Sansjofre
Céline C. Liorzou
Marina Rabineau

Abstract

We show that acid type did not significantly affect results. We also find that (i) glacial and interglacial samples do not react similarly to acid pre-treatment, (ii) high acid strength (>1.5 mol L-1) induces significant bias on δ13Corg and TOC values, and therefore on C/N ratios; (iii) 25% of an isotopically distinct pool of organic carbon was lost when using acid concentrations of 0.2-1.5 mol L-1, affecting δ13Corg values by more than 1.5‰; and (iv) geochemical evidence indicates that the leachable organic carbon pool is preferentially composed of terrestrial organic matter. These findings call for precautions when using C/N ratios and associated δ13Corg values for paleoenvironmental and climate reconstructions.
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Dates and versions

hal-01919651 , version 1 (12-04-2021)

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Virgil Pasquier, Pierre Sansjofre, Oanez Lebeau, Céline C. Liorzou, Marina Rabineau. Acid digestion on river influenced shelf sediment organic matter: Carbon and nitrogen contents and isotopic ratios. Rapid Communications in Mass Spectrometry, 2018, 32 (2), pp.86 - 92. ⟨10.1002/rcm.8014⟩. ⟨hal-01919651⟩
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