title: Red coralline algae assessed as marine pH proxies using 11B MAS NMR.
abstract: Reconstructing pH from biogenic carbonates using boron isotopic compositions relies on the assumption that only borate, and no boric acid, is present. Red coralline algae are frequently used in palaeoenvironmental reconstruction due to their widespread distribution and regular banding frequency. Prior to undertaking pH reconstructions using red coralline algae we tested the boron composition of the red coralline alga Lithothamnion glaciale using high field NMR. In bulk analysed samples, thirty percent of boron was present as boric acid. We suggest that prior to reconstructing pH using coralline algae 1) species-specific boron compositions and 2) within-skeleton special distributions of boron are determined for multiple species. This will enable site selective boron analyses to be conducted validating coralline algae as palaeo-pH proxies based on boron isotopic compositions.
authors: School of Geographical and Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, UK.
authors: M
authors: M
authors: Cusack
authors: School of Geographical and Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, UK.
authors: N A
authors: NA
authors: Kamenos
authors: Institut de Physique du Globe, Paris, France.
authors: C
authors: C
authors: Rollion-Bard
authors: LASIR University of Lille 1, Villeneuve d'Ascq, France.
authors: G
authors: G
authors: Tricot
mesh_terms: D001895:Boron / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D019906:Nuclear Magnetic Resonance, Biomolecular; D000461:Rhodophyta / Q000737:chemistry* / Q000378:metabolism; D013045:Species Specificity
chemical_list: D001895:Boron
references: Nature. 2005 Sep 29;437(7059):681-6
references: 16193043
references: Proc Natl Acad Sci U S A. 2010 Dec 28;107(52):22442-7
references: 21148422