Sains Malaysiana 39(1)(2010): 21–30

 

Kandungan dan Sumber Alkohol Lemak di dalam Sedimen

Muara di Sungai Kapar, Selangor

(Composition and Sources of Fatty Alcohols in Estuarine Sediments of Sungai Kapar, Selangor)

 

Norfariza Humrawali, Yeoh Lee Kwan, Mohd Talib Latif & Masni Mohd Ali*

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 E., Malaysia

 

Received: 29 January 2009 / Accepted: 27 May 2009

 

ABSTRAK

Kandungan sebatian alkohol lemak di dalam tujuh sampel sedimen permukaan dari muara Sungai Kapar, Selangor telah dikenal pasti menggunakan gas kromatografi-spektrometri jisim (GC-MS) dan hasilnya menunjukkan wujudnya 13 sebatian alkohol lemak (C12- C24) termasuk enam sebatian bercabang (-iso dan -anteiso) hadir. Secara keseluruhannya, sampel yang dikaji terdiri daripada 65% alkohol lemak rantai pendek (C12- C20) yang dihasilkan oleh organisma marin manakala 14% adalah alkohol lemak rantai panjang (C21- C24) yang berpunca daripada tumbuhan terestrial dan selebihnya merupakan sebatian bercabang yang dihasilkan oleh proses metabolisme bakteria. Sebatian C16 mendominasi kesemua stesen pensampelan dengan julat kepekatan 29.69-164.35 μgg-1 berat kering iaitu 32% daripada jumlah keseluruhan alkohol lemak. Nisbah antara alkohol lemak rantai pendek dan rantai panjang [Σ(C12- C20)/Σ(C21- C22)] bagi setiap stesen pensampelan memberikan nilai >1, menunjukkan kandungan alkohol lemak rantai pendek sumber marin adalah lebih tinggi daripada kandungan alkohol lemak rantai panjang. Indeks Sumber Alkohol (ASI) pula diguna untuk menganggar kesan input alkohol lemak terestrial ke dalam sedimen marin berdasarkan nisbah alkohol lemak C22/C14 menunjukkan stesen Kp1, Kp2, Kp5 dan Kp6 mempunyai nilai >1; iaitu kandungan C22 adalah lebih tinggi berbanding C14. Walau bagaimanapun, nisbah C22/C16 memberikan hasil yang sebaliknya dengan kesemua stesen didominasi oleh C16 berbanding C22. Kajian ini menunjukkan alkohol lemak (C12- C20) terutamanya sebatian C16 mendominasi kawasan muara Sungai Kapar, Selangor berbanding alkohol lemak rantai panjang (C21- C24).

 

Kata kunci: alkohol lemak; Sungai Kapar

 

ABSTRACT

 

A total of 13 fatty alcohols (C12- C24) including six branched compounds have been identified in seven surface sediment samples taken from Sungai Kapar, Selangor using computerized gas chromatography-mass spectrometry (GC-MS). Generally 65% of total fatty alcohols determined were short chain compounds (C12- C20) derived from marine organisms, 14% were long chained compounds (C21- C24) input of terrestrial plants and the rest were branched compounds from bacterial activity. C16 compound dominated all the sampling stations with concentrations ranged from 29.69 to 164.35 μgg-1 dry weight which constitute 32% of total fatty alcohols. Short chain/long chain fatty alcohols ratio [Σ(C12- C20)/Σ(C21- C22)] of each sampling stations had the value >1; indicating high content of short chain compounds from marine sources. Meanwhile, Alcohol Source Index (ASI) calculated using C22/C14 and C22/C16 ratios. C22/C14 ratio showed that stations Kp1, Kp2, Kp5 and Kp6 had a value >1 indicating the amount of C22 was higher than C14. Ratio of C22/C16 showed that all the sampling stations dominated by C16 compared to C22. The estuary of Sungai Kapar, Selangor was dominated by short chain fatty alcohols (C12- C20) especially C16 compound rather than long chain fatty alcohol (C21- C24).

 

Keywords: fatty alcohol; Sungai Kapar

 

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*Corresponding author; email: masni@ukm.my