Vertical profiles of natural uranium isotopes in sediment cores from Kota kinabalu and Labuan ports, Malaysia

Abdul Hafidz Yusoff, Che Abd. Rahim Mohamed

Research output: Contribution to journalArticle

Abstract

Sediment cores were collected from Kota Kinabalu and Labuan ports to determine the distribution of natural uranium isotopes, calcium (Ca), aluminium (Al) and total organic matter (TOM). A strong statistical correlation value between <sup>234</sup>U/<sup>238</sup>U and Ca contents were shown at Kota Kinabalu (r<sup>2</sup> = 0.811), and Labuan (r<sup>2</sup> = 0.833) ports. Good statistical correlation r<sup>2</sup> > 0.8 was also obtained between uranium isotopes and TOM at Kota Kinabalu port. Most activity ratio values of <sup>234</sup>U/<sup>238</sup>U found in sediment cores from Kota Kinabalu port were more than 1.0; the major input of uranium at Kota Kinabalu port may be related to the sorptive process of authigenic uranium that occurs in the water column. In this case, the mobile U(VI) was reduced to immobile U(IV) by organic matter and scavenged to the sediment with co-precipitation of organic matter and calcium carbonate. On the other hand, a low activity ratio of <sup>234</sup>U/<sup>238</sup>U (≤ 1) from Labuan was of detrital origin and also showed positive statistical correlation between calcium and aluminium.

Original languageEnglish
Pages (from-to)85-93
Number of pages9
JournalEnvironmentAsia
Volume8
Issue number2
Publication statusPublished - 1 Jul 2015

Fingerprint

uranium isotope
Uranium
Malaysia
Isotopes
Biological materials
vertical profile
sediment core
Sediments
organic matter
Aluminum
Calcium Isotopes
Calcium
uranium
aluminum
calcium
Calcium Carbonate
Coprecipitation
calcium carbonate
water column
Water

Keywords

  • Detrital
  • Limestone
  • Sediment core
  • Total organic matter (TOM)
  • Uranium

ASJC Scopus subject areas

  • Environmental Science(all)
  • Toxicology

Cite this

Vertical profiles of natural uranium isotopes in sediment cores from Kota kinabalu and Labuan ports, Malaysia. / Yusoff, Abdul Hafidz; Mohamed, Che Abd. Rahim.

In: EnvironmentAsia, Vol. 8, No. 2, 01.07.2015, p. 85-93.

Research output: Contribution to journalArticle

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