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The possible adverse effect of competitive binding on DGT (diffusive gradients in thin films) measurements of metals in marine situations was investigated. Of the divalent transition metals, manganese binds most weakly to Chelex resin and is most likely to be affected by competition. In media resembling seawater, the Chelex within DGT devices becomes saturated with Ca and Mg within 2h, and at pH 5–6...
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