NDLI: Natural uranium and thorium isotopes in sediment cores off Malaysian ports

Content Provider	Springer Nature Link
Author	Yusoff, Abdul Hafidz Sabuti, Asnor Azrin Mohamed, Che Abd Rahim
Copyright Year	2015
Abstract	Sediment cores collected from three Malaysian marine ports, namely, Kota Kinabalu, Labuan and Klang were analyzed to determine the radioactivities of $^{234}$U, $^{238}$U, $^{230}$Th, $^{232}$Th and total organic carbon (TOC) content. The objectives of this study were to determine the factors that control the activity of uranium isotopes and identify the possible origin of uranium and thorium in these areas. The activities of $^{234}$U and $^{238}$U show high positive correlation with TOC at the middle of sediment core from Kota Kinabalu port. This result suggests that activity of uranium at Kota Kinabalu port was influenced by organic carbon. The $^{234}$U/$^{238}$U value at the upper layer of Kota Kinabalu port was ≥1.14 while the ratio value at Labuan and Klang port was ≤ 1.14. These results suggest a reduction process occurred at Kota Kinabalu port where mobile U(VI) was converted to immobile U(IV) by organic carbon. Therefore, it can be concluded that the major input of uranium at Kota Kinabalu port is by sorptive uptake of authigenic uranium from the water column whereas the major inputs of uranium to Labuan and Klang port are of detrital origin. The ratio of $^{230}$Th/$^{232}$Th was used to estimate the origin of thorium. Low ratio value (lt; 1.5) at Labuan and Klang ports support the suggestion that thorium from both areas were come from detrital input while the high ratio (> 1.5) of $^{230}$Th/$^{232}$Th at Kota Kinabalu port suggest the anthropogenic input of $^{230}$Th to this area. The source of $^{230}$Th is probably from phosphate fertilizers used in the oil-palm cultivation in Kota Kinabalu that is adjacent to the Kota Kinabalu port.
Starting Page	403
Ending Page	412
Page Count	10
File Format	PDF
ISSN	17385261
Journal	Ocean Science Journal
Volume Number	50
Issue Number	2
e-ISSN	20057172
Language	English
Publisher	Korea Ocean Research and Development Institute and The Korean Society of Oceanography
Publisher Date	2015-07-09
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	uranium thorium sediment core Kota Kinabalu port total organic carbon (TOC) detrital Oceanography Marine & Freshwater Sciences Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Oceanography

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