Malaysian Applied Biology Journal

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29-1&2-10

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

CHROMIUM TOXICITY ON ANABAENA FLOS-AQUAE

KHAIRIAH, J., MUSHRIFAH, I. and TAN, J.

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

ABSTRACT

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.


ABSTRAK

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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