Iridium in Natural Waters

Details Iridium in Natural Waters Iridium in Natural Waters

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...273.1524a&link_type=abstract

Science, Volume 273, Issue 5281, pp. 1524-1528

Physics

13

Scientific paper

Iridium, commonly used as a tracer of extraterrestrial material, was measured in rivers, oceans, and an estuarine environment. The concentration of iridium in the oceans ranges from 3.0 (±1.3) x 10^8 to 5.7 (±0.8) x 10^8 atoms per kilogram. Rivers contain from 17.4 (±0.9) x 10^8 to 92.9 (±2.2) x 10^8 atoms per kilogram and supply more dissolved iridium to the oceans than do extraterrestrial sources. In the Baltic Sea, ~75% of riverine iridium is removed from solution. Iron-manganese oxyhydroxides scavenge iridium under oxidizing conditions, but anoxic environments are not a major sink for iridium. The ocean residence time of iridium is between 2x 10^3 and 2 x 10^4 years.

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