title: Iridium in sea-water.
abstract: Iridium in sea-water has been measured (after isolation from the saline matrix by reduction with magnesium) by neutron bombardment, radiochemical purification and high-resolution gamma-ray spectroscopy. The concentration obtained in a Pacific coastal water was 1.02 +/- 0.26 x 10(-14) g per g of sea-water. At such extremely low concentrations, seawater is an extremely unlikely source for anomalously high iridium concentrations measured in the Cretaceous-Tertiary boundary layer of deep-sea sediments.
authors.affiliation: Department of Chemistry, McGill University, Montreal, Quebec, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Fresco
authors.forename: H V
authors.initials: HV
authors.lastname: Weiss
authors.forename: R B
authors.initials: RB
authors.lastname: Phillips
authors.forename: R A
authors.initials: RA
authors.lastname: Askeland