Malaysian Applied Biology Journal

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Malays. Appl. Biol. (December 2000) 29(1&2): 75-78



Program Sains Sekitaran, Pusat Pengajian Sains Sekitaran dan Sumber Alam Fakulti Sains dan Teknologi UKM, 43600 Bangi, Selangor, Malaysia


Chromium was introduced to batch cultures of Anabaena flos-aquae at various concentration of 0.5 mg/1, 1.5 mg/1, 2.0 mg/1 and 4.0 mg/1. Relative to the control there is an increase in growth of A. flos-aquae that were exposed to 0.5 mg/1, 1.0 mg/1, 2.0 mg/1. Growth of cultures were inhibited at the higher Cr concentration. The 96hr LD50 oi A. flos-aquae exposed to Cr was 2.44 mg/1. The amount of Cr absorbed by A. flos-aquae at various Cr concentrations were 66.2%, 31.1%, 17.9%, 14.0% and 9.3% dry weight respectively.


Logam kromium telah didedahkan kepada kultur kelompok Anabaena flos-aquae pada kepekatan yang berbeza meliputi 0.5 mg/1, 1.0 mg/1, 1.5 mg/1, 2.0 mg/1, 2.5 mg/1 dan 4.0 mg/1. Terdapat peningkatan pertumbuhan A. flos-aquae secara relatif berbanding dengan kawalan pada kepekatan 0.5 mg/1, 1.0 mg/1, 1.5 mg/1 dan 2.0 mg/1. Perencatan pada pertumbuhan A. flos-aquae berlaku pada kepekatan Cr yang lebih tinggi. Nilai dos maut 96jLD50 Cr untuk A. flos-aquae ialah 2.44 mg/1. Kepekatan Cr yang diserap oleh A. flos-aquae pada kepekatan yang diberikan adalah 66.2%, 31.1% 17.9%, 14.0% dan 9.3% perberat kering.

Key words: Chromium, Anabaena flos-aquae, freshwater, toxicity, mortality.


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