Sains Malaysiana 34(2): 129-133 (2005)

Effects of Wet Deposition on Levels of Selected Heavy Metals in Labu

River: A Snapshort Study of a Sub-urban Lotic Ecosystem

(Kesan Enapan Basah terhadap Aras Logam Berat Terpilih dalam Sungai Labu)

Lim Sun Hoo & Abdullah Samat

School of Environmental and Natural Resource Sciences

Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E.,Malaysia

Mohd. Rozali Othman

School of Chemical Science and Food Technology

Faculty of Science and Technology

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E..,Malaysia

ABSTRAK

Satu kajian telah dijalankan untuk menentukan kesan hujan (enapan basah) ke atas kepekatan logam-logam berat (kadmium, kuprum, ferum, plumbum, mangan dan zink) di dalam air Sungai Labu. Penelitian dibuat dalam kawasan tadahan Sungai Labu yang terdiri dari Sungai Batang Labu dan Sungai Batang Nilai. Kawasan kajian ini meliputi ladang-ladang pertanian, penempatan dan perbandaran. Kepekatan kadmium (Cd) dan zink (Zn) masing-masing dari segi statistik mempunyai korelasi positif (r=0.17 dan r=0.66) dengan enapan basah. Sementara logam-logam berat yang lain mempunyai korelasi negatij dengan enapan basah. Plumbum (Pb) mempamirkan nilai korelasi tertinggi (r=­0.52), diikuti oleh mangan (Mn), ferum (Fe) dan kuprum (Cu) masing-masing dengan r=-0.30, -0.16 dan -0.09. Hasil ini menunjukkan bahawa enapan basah telah tidak mempengaruhi paras Cu, Fe, Pb dan Mn dalam Sungai Labu. Kemasukan pencemar logam daripada sumber-sumber antropogenik didapati telah menyumbang kepada kebanyakan logam berat yang wujud.

Kata kunci: Enapan basah, logam berat, Sungai Labu.

ABSTRACT

A study was carried out to determine the effects of rainfall (wet deposition) on heavy metal (cadmium, copper, iron, lead, manganese and zinc) concentrations in water of the Labu River. Research was undertaken within the Labu River catchment area consisting of Batang Labu River and Batang Nilai River that flow through agricultural estates, residential and urban areas. Cadmium (Cd) and zinc (Zn) concentrations were statistically positively correlated (r=0.17 and r=0.66 respectively) with wet deposition, while other heavy metals were negatively correlated with wet deposition. Lead (Pb) exhibited the highest correlated value (r=-0.52),followed by manganese (Mn), iron (Fe) and copper (Cu) with r=-0.30, -0.16, -0.09 respectively. Results showed that wet deposition did not significantly influence the levels of Cu, Fe, Pb and Mn in the Labu River. Inputs of metal pollutants derived from anthropogenic sources may contribute to most of the existing heavy metals observed.

Keywords: Wet Deposition, Heavy Metal, Labu River

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