Sains Malaysiana 34(2): 49-54 (2005)

Kepekatan Logam Berat dalam Air di Lembangan

Sungai Semenyih, Selangor

(Heavy Metals Concentrations in Water of Sungai Semenyih

Watershed, Selangor)

M. Shuhaimi-Othman & Muhd Barzani Gasim

Pusat Pengajian Sains Sekitaran & Sumber Alam

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600, UKM Bangi, Selangor D.E. Malaysia

ABSTRAK

Kajian kepekatan logam berat dalam air di lembangan Sungai Semenyih telah dijalankan di mana 11 stesen pensampelan telah dipilih. Sampel air permukaan bagi penentuan logam berat telah diambil dan beberapa parameter kualiti air telah ditentukan di setiap stesen. Logam berat merkuri (Hg), kadmium (Cd), zink (Zn), plumbum (Pb), kuprum (Cu), nikel (Ni), ferum (Fe), cobalt (Co) dan mangan (Mn) telah ditentukan dalam sampel air. Keputusan menunjukkan secara amnya logam berat kajian berada di bawah kepekatan maksimum yang dicadangkan tetapi melebihi kepekatan berterusan yang dibenarkan bagi air permukaan (EPA) dan kepekatan bagi melindungi hidupan akuatik (CCME). Analisis statistik (ANOVA) menunjukkan terdapat perbezaan beerti (p<0.05) antara stesen pensampelan bagi semua logam berat kajian. Bagi logam Fe dan Mn terdapat trend peningkatan daripada hulu ke hilir lembangan Sungai Semenyih. Bagi parameter kualiti air; kajian menunjukkan terdapat trend peningkatan terutama bagi parameter konduktiviti dan kekeruhan di beberapa stesen terutama yang berhampiran kawasan pertanian, industri dan penduduk.

Kata kunci: Logam berat, Sungai Semenyih, lembangan

ABSTRACT

A study on heavy metal concentrations in water of Sungai Semenyih watershed has been conducted at 11 sampling stations. Surface water samples for heavy metals determination were collected and some water quality parameters were determined at each station. Metals such as mercury (Hg), cadmium (Cd), zinc (Zn), lead (Pb), copper (Cu), nickel (Ni), iron (Fe), cobalt (Co) and manganese (Mn) were determined in the water samples. The results showed that in general heavy metals concentratios were lower than maximum concentrations allowed but higher than continuous concentration (EPA) and concentration for aquatic life protection (CCME). Statistical analyses (ANOVA) show that there are significant differences (p<0.05) between sampling stations for all metals and there was a trend of increase in Fe and Mn from upstream to downstream Sungai ~emenyih watershed. For other water quality parameters, there was a trend of increase in conductivity and turbidity at some stations especially at agriculture, industrial and residential areas.

Keywords: Heavy metal, Sungai Semenyih, Watershed  

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