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Related Experiment Video

Updated: Jun 28, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

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Published on: February 11, 2016

Iridium in sea-water.

J Fresco¹, H V Weiss, R B Phillips

¹Department of Chemistry, McGill University, Montreal, Quebec, Canada.

|August 1, 1985

Summary

This summary is machine-generated.

Seawater contains extremely low iridium concentrations, measured at 1.02 x 10^-14 g/g. This finding suggests seawater is not the source of high iridium levels found in Cretaceous-Tertiary boundary sediments.

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Published on: April 21, 2022

Area of Science:

Geochemistry
Marine Chemistry
Nuclear Chemistry

Background:

Iridium anomalies in Cretaceous-Tertiary boundary sediments suggest extraterrestrial impact events.
Understanding iridium's oceanic concentration is crucial for distinguishing between impact and terrestrial sources.

Purpose of the Study:

To accurately measure the concentration of iridium in seawater.
To evaluate the role of seawater as a potential source for sedimentary iridium anomalies.

Main Methods:

Iridium isolation from seawater using magnesium reduction.
Neutron bombardment for activation analysis.
Radiochemical purification and high-resolution gamma-ray spectroscopy for detection.

Main Results:

Measured Pacific coastal seawater iridium concentration at 1.02 +/- 0.26 x 10^-14 g/g.
Demonstrated extremely low levels of dissolved iridium in marine environments.

Conclusions:

Seawater is an improbable source for the anomalously high iridium concentrations observed in Cretaceous-Tertiary boundary sediments.
The study supports extraterrestrial origins for the iridium spike at the Cretaceous-Tertiary boundary.