Sains Malaysiana 36(1): 9-13 (2007)

Perubahan Nisbah ²³⁴U/²³⁸U dalam Pepejal Terampai

di Kuala Selangor, Selangor, Malaysia

(Ratio Fluactution of ²³⁴U/²³⁸U in the Suspended Particles at Kuala

 Selangor, Selangor, Malaysia)

Khairul Nizam Mohd Ramli, Che Abd. Rahim Mohamed

Pusat Pengajian Sains Sekitaran & Sumber Alam

Fakulti Sains & Teknologi, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, Malaysia

Zaharuddin Ahmad

Malaysian Institute For Nuclear Technology Research (MINT)

Bangi, 43000 Kajang, Selangor, Malaysia

ABSTRAK

Kajian ini dijalankan bagi mengenalpasti kepelbagaian nisbah ²³⁴U/²³⁸U yang wujud di dalam jumlah pepejal terampai (TSS) pada lapan stesen yang berbeza di Kuala Selangor, Selangor. Prosedur kajian ini melibatkan proses persampelan, pemendakan, resin penukaran anion, pemendakan elektrik dan teknik pengiraaan spektrometer alfa. Nisbah ²³⁴U/²³⁸U adalah paling tinggi di Stesen 8 (²³⁴U/²³⁸U = 2.98) dan Stesen 2  (²³⁴U/²³⁸U = 3.34) pada persampelan pertama. Manakala pada persampelan kedua julat nisbah ²³⁴U/²³⁸U adalah lebih luas iaitu antara 1.29 (Stesen 4) hingga 11.57 (Stesen 6). Ini disebabkan oleh berlakunya pergerakan ²³⁴U bersama-sama mikroorganisme di dalam fasa terampai dan berlaku proses penurunan U(VI) kepada U(IV) yang akan memendakkan uranium daripada air ke dalam sedimen.

Kata kunci:nisbah ²³⁴U/²³⁸U; pepejal terampai; Kuala Selangor

ABSTRACT

This study was performed to identify the variability of ²³⁴U/²³⁸U ratio in the suspended solid (TSS) at eight different stations at Kuala Selangor, Selangor. The analytical procedures include field sampling, precipitation, anion exchange, electro-deposition and alpha counting using alpha spectrometer. The ²³⁴U/²³⁸U ratio value is highest at Station 8 (²³⁴U/²³⁸U = 2.98) and Station 2 (²³⁴U/²³⁸U = 3.34) obtained during first sampling. While in second sampling, the range of  ²³⁴U/²³⁸U ratio is between 1.29 (Station 4) to 11.57 (Station 6). This is because of the mobalization of ²³⁴U by microorganisms in the suspended phase and the reduction of U(VI) to U(IV) which will deposite the uranium from water to the sediment.

Keywords: ²³⁴U/²³⁸U ratio; suspended particles; Kuala Selangor

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