Sains Malaysiana 40(8)(2011): 841–851

Variasi Alkohol Lemak dalam Sedimen Permukaan di Sungai Sepang Besar, Sepang, Selangor

(Fatty Alcohol Variations in Surface Sediments of Sungai Sepang Besar, Sepang, Selangor)

Masni Mohd Ali*, Norfariza Humrawali, Pang Qing Ying & Mohd Talib Latif

Pusat Pengajian Sains Sekitaran dan Sumber Alam, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E.,Malaysia

Mohamad Pauzi Zakaria

Jabatan Sains Alam Sekitar, Fakulti Pengajian Alam Sekitar, Universiti Putra Malaysia

43400 Serdang, Selangor D.E. Malaysia

Diserahkan: 27 April 2010 / Diterima: 27 Ogos 2010

ABSTRAK

Kandungan alkohol lemak di dalam 19 sampel sedimen permukaan di Sungai Sepang Besar, Sepang, Selangor telah dianalisis menggunakan kromatografi gas-spektrometer jisim (GC-MS). Sebanyak 19 sebatian alkohol lemak dengan julat kepekatan 0.02 μg/g – 9.01 μg/g berat kering dikenalpasti yang terdiri daripada alkohol lemak C12 sehingga C30 termasuk 4 sebatian bercabang. Alkohol lemak C26 mendominasi kebanyakan stesen persampelan dengan julat 0.29 – 5.43 μg/g berat kering, iaitu 15.5% daripada jumlah alkohol lemak. Berdasarkan kepekatan individu sebatian alkohol lemak dan nisbah [Σ(C12 - C20)/Σ(C22 - C30)], Sungai Sepang Besar boleh dikatakan mengandungi alkohol lemak berantai pendek (C12 - C20) yang tinggi berasal daripada organisma marin. Walau bagaimanapun, nilai Indeks Sumber Alkohol (ASI) tidak menunjukkan Sungai Sepang Besar didominasi oleh alkohol lemak rantai pendek kerana faktor kandungan sebatian C26 yang tinggi di kebanyakan stesen persampelan. Nilai nisbah alkohol lemak (rantai ganjil)/(rantai genap) adalah tinggi bagi hampir kesemua stesen persampelan yang dipengaruhi oleh aktiviti bakteria yang tinggi. Dengan itu dapat disimpulkan bahawa sedimen permukaan Sungai Sepang Besar mengandungi campuran bahan organik yang berasal dari marin, terestrial dan bakteria.

Kata kunci: Alkohol lemak; bahan organik; Sungai Sepang; sedimen

ABSTRACT

Composition of fatty alcohols from 19 surface sediment samples collected along Sungai Sepang Besar, Sepang, Selangor were determined. The sediments were extracted and analysed using the Gas Chromatography-Mass Spectrometry (GC-MS) technique. A total of 19 fatty alcohols from C12 to C30 including 4 branched compounds were identified with concentrations in the range 0.02 μg/g – 9.01 μg/g dry weight. C26 fatty alcohols dominated most sampling stations with concentrations ranging from 0.29 to 5.43 μg/g dry weight and constitued 15.5% of total fatty alcohols. According to individual compounds of fatty alcohols and the [Σ(C12 - C20)/Σ(C22 - C30)] ratio, Sungai Sepang Besar has a high composition of short-chain fatty alcohols (C12 - C20) which mainly originate from marine organisms. However, the Alcohol Sources Index (ASI) showed that terrestrial derived fatty alcohols dominated the area due to high concentration of C26 compounds in most sampling stations. The value of (odd chain length)/(even chain length) ratios were high for almost all the sampling stations due to high bacterial activities. It can be concluded that the surface sediments of Sungai Sepang Besar contained organic materials from marine, terrestrial and bacterial sources.

Keywords: Fatty alcohol; organic materials; Sungai Sepang; sediments

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*Pengarang untuk surat-menyurat; email: masni@ukm.my