Sains Malaysiana 36(2): 133-137 (2007)

Pemonitoran Intensif Beberapa Nutrien Dalam Sungai

Sarawak di Kuching, Sarawak, Malaysia

(Intensive Monitoring of a Few Nutrients of the Sarawak

River at Kuching, Sarawak, Malaysia)

Lee Yook Heng

Pusat Pengajian Sains Kimia & Teknologi Makanan

Fakulti Sains & Teknologi, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, D.E.

Manaferry Madhan, Penny Sumok

Lembaga Sumber Asli dan Alam Sekitar Sarawak (NREB)

Kuching, Sarawak

Lee Nyanti Chukong

Fakulti Sains & Teknologi Sumber

UNIMAS, Kota Samarahan, Sawarak

Diserahkan: 2 Jun 2006 / Diterima: 20 Mac 2007 

ABSTRAK

Perubahan beberapa nutrien dan parameter kualiti air Sungai Sarawak telah dikaji melalui pensampelan serta analisis air secara intensif, iaitu empat kali pensampelan di sebelah pagi dan empat kali pada waktu petang. Stesen pensampelan air terletak di Waterfront, bandaraya Kuching dan satu lagi stesen yang terletak di bahagian hulu iaitu Batu Kitang yang berdekatan dengan tapak pengambilan air. Stesen pensampelan Batu Kitang diadakan untuk tujuan perbandingan kualiti air. Nutrien yang telah dianalisis terdiri daripada ammonium, nitrat, fosfat terlarut, sulfat dan kation utama (K, Na, Ca, Mg). Aras ion ammonium, nitrat, fosfat terlarut dan sulfat dalam Sungai Sarawak di stesen Waterfront  ialah 0.03 – 0.67, 0.03 – 0.14, 0.03 – 0.74 dan 0.02-0.38 mg/L masing-masing. Perubahan maksimum yang dicerap dalam sehari untuk ammonium ialah 25 kali ganda, untuk fosfat terlarut dan sulfat ialah hampir 11 kali ganda dan untuk nitrat dan kation utama, perubahan maksimum hanya kurang daripada dua kali ganda. 

Kata kunci: Nutriens; kualiti air; Sungai Sarawak; pemonitoran intensif

ABSTRACT 

The variation of several nutrients and water quality parameters in Sarawak River was examined by intensive monitoring, i.e. four times in the morning and also four times in the afternoon. The sampling stations selected were at the Waterfront of Kuching town and at Batu Kitang upstream of the Sarawak River, near to a water intake point. The Batu Kitang station was used as a reference station for water quality comparison. The nutrients examined are ammonium, nitrate, dissolved phosphate, sulphate and major cations (K, Na, Ca, Mg). The levels of ammonium, nitrate, phosphate and sulphate in the Sarawak River at the Waterfront station are 0.03 – 0.67, 0.03 – 0.14, 0.03 – 0.74 and 0.02-0.38 mg/L respectively. The maximum changes in the level of ammonium within a day could be up to 25 folds, whilst that for dissolved phosphate and sulphate were approximately 11 folds. Only nitrate and the major cations were observed to vary by less than two folds during a one-day water monitoring.  

Keywords: Nutrients; water quality;  Sarawak River;  intensive monitoring

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