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\begin{document}

\title{Matrix-independent B isotope analysis of silicate and carbonate
reference materials by UV femtosecond LA-MC-ICP-MS with application to
the cold-water coral Desmophyllum dianthus}



\author[1]{Grit Steinhoefel}%
\author[2]{Kristina Beck}%
\author[2]{Albert Benthien}%
\author[2]{Klaus-Uwe Richter}%
\author[3]{Gertraud  Schmidt-Grieb}%
\author[2]{Jelle Bijma}%
\affil[1]{Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung}%
\affil[2]{Alfred Wegener Institute for Marine and Polar Research}%
\affil[3]{Alfred-Wegener-Institut für Polar und Meeresforschung}%


\vspace{-1em}



  
  \date{June 09, 2024}


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\selectlanguage{english}
\begin{abstract}
RATIONALE Boron isotopes are a powerful tool for pH reconstruction in
marine carbonates and as tracer for fluid-mineral interaction in
geochemistry. Micro-analytical approaches based on laser ablation
multi-collector inductively coupled plasma mass spectrometry
(LA-MC-ICP-MS) often suffer from effects induced by the sample matrix.
In this study, we investigated matrix-independent analyses of B isotopic
ratios and applied this technique to cold-water corals. METHODS We
employed a customized 193 nm femtosecond laser ablation system
(Solstice, Spectra-Physics) coupled to a MC-ICP-MS (Nu Plasma II, Nu
Instruments) equipped with electron multipliers for in situ measurements
of B isotope ratios (11B/10B) at the micron-scale. We analyzed various
reference materials of silicate and carbonate matrices using non-matrix
match calibration without employing any correction mode. This approach
was then applied to investigates defined increments in coral samples
from a Chilean fjord. RESULTS We obtained accurate B isotope ratios with
a precision of \selectlanguage{ngerman}± 0.9\selectlanguage{english}%0 (2 SD) for various reference materials including
silicate glasses (GOR132-G, StHs6/80-G, ATHO-G, and NIST SRM 612), clay
(IAEA-B-8) and carbonate (JCp-1) using the silicate glass NIST SRM 610
as calibration standard, which shows that neither laser-induced nor
ICP-related matrix effects are detectable. The application to cold-water
corals (Desmophyllum dianthus) reveal little intra-skeleton variations
in \selectlanguage{greek}δ\selectlanguage{english}11B with average values between 23.27 and 26.09%0. CONCLUSIONS Our
instrumental set-up provides accurate and precise B isotopic ratios
independently of the sample matrix at the micron-scale. This approach
opens a wide field of application in geochemistry, including pH
reconstruction in biogenic carbonates and deciphering processes related
to fluid-mineral interaction.%
\end{abstract}%



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\textbf{Hosted file}

\verb`B_Laser_Steinhoefel_Final.docx`  available at \url{https://authorea.com/users/566045/articles/612847-matrix-independent-b-isotope-analysis-of-silicate-and-carbonate-reference-materials-by-uv-femtosecond-la-mc-icp-ms-with-application-to-the-cold-water-coral-desmophyllum-dianthus}\selectlanguage{english}
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\includegraphics[width=0.70\columnwidth]{figures/Fig-coral-1/Fig-coral-1}

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\includegraphics[width=0.70\columnwidth]{figures/Fig-Coral-Data-4/Fig-Coral-Data-4}

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\includegraphics[width=0.70\columnwidth]{figures/Table3-corals/Table3-corals}

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