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        <gco:CharacterString>Guaymas sulfate &amp;amp; sulfide (UNC Chapel Hill) Dataset Description: &amp;lt;p&amp;gt;Porewater sulfate and sulfide concentrations in Alvin pushcore samples collected from Guaymas Basin hydrothermal vents during R/V Atlantis cruise AT42-05 in November 2018. This dataset was obtained at the University of North Carolina Chapel Hill.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Porewater sulfate and sulfide samples from this cruise were also analyzed at the Max Planck Institute for Marine Microbiology. See related dataset: &amp;lt;a href=&amp;quot;https://www.bco-dmo.org/dataset/816549&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;https://www.bco-dmo.org/dataset/816549&amp;lt;/a&amp;gt; (MPI)&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;This porewater dataset was obtained by Chris Chambers at the University of North Carolina Chapel Hill. The sampling site names in the data are based on Teske et al. 2016.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;For analysis at UNC (Chris Chambers), porewater was obtained from freshly collected sediment push cores on R/V Atlantis. The sediment cores were sampled in 3 cm intervals; ca. 40 ml sediment samples were centrifuged in 50 ml conical Falcon tubes for 5 to 10 minutes at approx. 1000 g, until the sediment had settled and produced ca. 8 to 10 ml of porewater. The sediment interval depths are given in the dataset (Sediment_depth). For porewater sulfide analysis, 1 ml porewater subsamples were drawn into syringes, filtered immediately through 0.45 μm filters, and placed in Eppendorf sample vials each containing 0.1 ml of 0.1 M zinc acetate solution to preserve the sulfide as zinc sulfide until analyzed. Sulfide was quantified spectrophotometrically at UNC-Chapel Hill using the methylene blue method (Cline 1969). For sulfate analysis, 1 ml porewater samples were acidified with 50 microliters of 1 N HCl, and bubbled with N2 for 1 minute to remove hydrogen sulfide. After returning the samples to the home laboratory, sulfate concentrations were determined using the ion chromatograph of the UNC Environmental Program.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;Problem report: Transport problems have caused sample losses among the porewater samples, which are evident in occasional gaps in porewater profiles.&amp;lt;/p&amp;gt;</gco:CharacterString>
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