Dissolved zirconium in the North Pacific Ocean

Details Dissolved zirconium in the North Pacific Ocean Dissolved zirconium in the North Pacific Ocean

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3801m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 15, pp.3801-3805

Computer Science

3

Scientific paper

Picomolar levels of dissolved Zr in seawater were measured using an analytical technique developed with a Chelex-100 extraction/concentration step and subsequent detection by isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS). Here we present the first vertical profile of Zr in the oceans, from the central-North Pacific, and a horizontal surface transect across the western Pacific. Dissolved Zr ranges from 12-95 pmol/kg in the surface waters then increases linearly with depth to a maximum of 300 pmol/kg in the deep water. The vertical profile shows a strong correlation with Si in the mid-waters, with higher Zr / Si ratios in the surface and bottom waters. There is evidence of both a bottom source and a coastal source of dissolved Zr to the oceans. A comparison with dissolved Ti and Be shows similar depth dependence, but an enrichment in Zr / Ti and a depletion in Zr / Be ratios in seawater relative to average crustal materials. Zirconium appears to have a reactivity intermediate between these two elements.

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