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</table>Dbkhttp://earthwise.bgs.ac.uk/index.php?title=OR/14/067_Summary&diff=25507&oldid=prevAjhil at 16:35, 12 February 20162016-02-12T16:35:31Z<p></p>
<p><b>New page</b></p><div>__NOTOC__<br />
{{OR/14/067}}<br />
In this report we outline a method to isolate phosphate as pure Ag<sub>3</sub>PO<sub>4</sub> for waters with high C:P ratios for δ<sup>18</sup>O analysis. This report details a method that can be used to minimise residual organic contamination of the final Ag<sub>3</sub>PO<sub>4</sub>, therefore significantly reducing uncertainties in the final interpretation of δ<sup>18</sup>O results.<br />
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This includes the use of column resins in series to (i) remove the majority of dissolved organic carbon and (ii) isolate/pre-concentrate PO<sub>4</sub>. This is followed by the use of a modified McLaughlin et al (2004)<ref name="McLaughlin 2004">MCLAUGHLIN, K, SILVA, S, KENDALL, C, STUART-WILLIAMS, H, and PAYTAN, A. 2004. A precise method for the analysis of δ<sup>18</sup>O of dissolved inorganic phosphate in seawater. ''Limnol. Oceanogr.: Methods'', 2, 202–212.</ref> method for PO<sub>4</sub> precipitation, with an additional final hydrogen peroxide clean-up step to remove residual organic matter following precipitation of Ag<sub>3</sub>PO<sub>4</sub>. The reagents required for this method are first listed, and then a step-by-step account of the process is outlined. Importantly, it contains adequate detail to be used by other researchers in this field or modified to suit their particular research objectives.<br />
==References==<br />
<References/><br />
[[category:OR/14/067 Method for analysing phosphate 18O/16O ratios for waters with high C:P ratios| 01]]</div>Ajhil