Vertical distribution of scandium in the north central Pacific

Hiroshi Amakawa, Miho Nomura, Kazunori Sasaki, Yasuji Oura, Mitsuru Ebihara

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The concentrations of scandium (Sc) in seawater, which have remained unreported since the early 1970s, were determined together with those of yttrium. (Y) and lanthanides (Ln) with samples from the north central Pacific Ocean (St. BO-3). The Sc concentration shows a so-called nutrient-like profile: it increases gradually from the surface (about 2 pmol/kg) to the ocean floor (about 20 pmol/kg). That pattern closely resembles those of Y and Ln (correlation coefficient (r) > 0.92). Some light-to-middle Ln (Pr-Tb) exhibit a closer correlation with Sc than do Y, La, or heavy Ln (Ho-Lu). In contrast, Y/Sc and Ln/Sc ratios (elemental abundance ratios) indicate that Sc is depleted compared to either Y or Ln in seawater more than in loess, which represents chemical compositions of crustal material. These observations offer a conflicting view of chemical reactivity related Y, Ln, and Sc: r values show that the chemical reactivity of Sc resembles those of Y and Ln, but differences of Y/Sc and Ln/Sc ratios in seawater and in loess suggest that the chemical reactivity of Sc differs from those of Y and Ln. More Sc data for seawater are necessary to clarify the chemical reactivity of Sc in the ocean. We also propose that comparative studies of vertical profiles of Sc and such elements as Fe, Ti, Zr, and Hf showing so-called nutrient-like profiles at the same oceanic stations would be helpful and effective for clarifying the behavior of Sc in the ocean.

Original languageEnglish
Article numberL11606
JournalGeophysical Research Letters
Volume34
Issue number11
DOIs
Publication statusPublished - 2007 Jun 16
Externally publishedYes

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scandium
vertical distribution
rare earth element
reactivity
seawater
oceans
nutrients
loess
ocean
profiles
yttrium
nutrient
Pacific Ocean

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Vertical distribution of scandium in the north central Pacific. / Amakawa, Hiroshi; Nomura, Miho; Sasaki, Kazunori; Oura, Yasuji; Ebihara, Mitsuru.

In: Geophysical Research Letters, Vol. 34, No. 11, L11606, 16.06.2007.

Research output: Contribution to journalArticle

Amakawa, Hiroshi ; Nomura, Miho ; Sasaki, Kazunori ; Oura, Yasuji ; Ebihara, Mitsuru. / Vertical distribution of scandium in the north central Pacific. In: Geophysical Research Letters. 2007 ; Vol. 34, No. 11.
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