Natural uranium and thorium isotopes in sediment cores off Malaysian ports

Sediment cores collected from three Malaysian marine ports, namely, Kota Kinabalu, Labuan and Klang were analyzed to determine the radioactivities of 234U, 238U, 230Th, 232Th and total organic carbon (TOC) content. The objectives of this study were to determine the factors that control the activity...

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Main Authors:	Yusoff, Abdul Hafidz, Sabuti, Asnor Azrin, Mohamed, Che Abd Rahim
Format:	Article
Language:	English
Published:	SpringerLink 2015
Subjects:	GC Oceanography GE Environmental Sciences
Online Access:	http://irep.iium.edu.my/46555/ http://irep.iium.edu.my/46555/1/Yusoff_et_al_%282015%29.pdf

id	iium-46555
recordtype	eprints
spelling	iium-465552015-12-29T06:39:55Z http://irep.iium.edu.my/46555/ Natural uranium and thorium isotopes in sediment cores off Malaysian ports Yusoff, Abdul Hafidz Sabuti, Asnor Azrin Mohamed, Che Abd Rahim GC Oceanography GE Environmental Sciences Sediment cores collected from three Malaysian marine ports, namely, Kota Kinabalu, Labuan and Klang were analyzed to determine the radioactivities of 234U, 238U, 230Th, 232Th 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 234U and 238U 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 234U/238U 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 230Th/232Th was used to estimate the origin of thorium. Low ratio value (< 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 230Th/232Th at Kota Kinabalu port suggest the anthropogenic input of 230Th to this area. The source of 230Th is probably from phosphate fertilizers used in the oil-palm cultivation in Kota Kinabalu that is adjacent to the Kota Kinabalu port. SpringerLink 2015-04-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46555/1/Yusoff_et_al_%282015%29.pdf Yusoff, Abdul Hafidz and Sabuti, Asnor Azrin and Mohamed, Che Abd Rahim (2015) Natural uranium and thorium isotopes in sediment cores off Malaysian ports. Ocean Science Journal, 50 (2). pp. 1-10. ISSN 2005-7172
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	GC Oceanography GE Environmental Sciences
spellingShingle	GC Oceanography GE Environmental Sciences Yusoff, Abdul Hafidz Sabuti, Asnor Azrin Mohamed, Che Abd Rahim Natural uranium and thorium isotopes in sediment cores off Malaysian ports
description	Sediment cores collected from three Malaysian marine ports, namely, Kota Kinabalu, Labuan and Klang were analyzed to determine the radioactivities of 234U, 238U, 230Th, 232Th 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 234U and 238U 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 234U/238U 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 230Th/232Th was used to estimate the origin of thorium. Low ratio value (< 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 230Th/232Th at Kota Kinabalu port suggest the anthropogenic input of 230Th to this area. The source of 230Th is probably from phosphate fertilizers used in the oil-palm cultivation in Kota Kinabalu that is adjacent to the Kota Kinabalu port.
format	Article
author	Yusoff, Abdul Hafidz Sabuti, Asnor Azrin Mohamed, Che Abd Rahim
author_facet	Yusoff, Abdul Hafidz Sabuti, Asnor Azrin Mohamed, Che Abd Rahim
author_sort	Yusoff, Abdul Hafidz
title	Natural uranium and thorium isotopes in sediment cores off Malaysian ports
title_short	Natural uranium and thorium isotopes in sediment cores off Malaysian ports
title_full	Natural uranium and thorium isotopes in sediment cores off Malaysian ports
title_fullStr	Natural uranium and thorium isotopes in sediment cores off Malaysian ports
title_full_unstemmed	Natural uranium and thorium isotopes in sediment cores off Malaysian ports
title_sort	natural uranium and thorium isotopes in sediment cores off malaysian ports
publisher	SpringerLink
publishDate	2015
url	http://irep.iium.edu.my/46555/ http://irep.iium.edu.my/46555/1/Yusoff_et_al_%282015%29.pdf
first_indexed	2023-09-18T21:06:17Z
last_indexed	2023-09-18T21:06:17Z
_version_	1777410954714152960

Natural uranium and thorium isotopes in sediment cores off Malaysian ports

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