| Atomic number: | 78 |
| Atomic weight: | 195.08 |
| Average concentration in ocean: | 250 fmol/kg |
| Residence time: |
Distribution in ocean
The vertical profile of
platinum concentration has been determined in the Pacific, Indian and Atlantic
Oceans with somewhat different results (data).
A nutrient-like profile was found in the Pacific (Goldberg et al., 1986).
A scavenged element profile was found in the Indian Ocean (Jacinto and van den
Berg, 1989). A conservative profile was found with uniform values of
280±70 fmol/kg in the Atlantic Ocean and 240±70 fmol/kg in the Pacific
Ocean (Colodner et al., 1993).
Speciation
Platinum exists in seawater in the +II oxidation state as PtCl42-.
Analysis
Platinum has been determined by inductively coupled plasma mass spectrometry and
graphite furnace atomic absorption spectrometry after sample preconcentration
and by cathodic stripping voltammetry.