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Research Journal of Environmental Sciences
Year: 2010  |  Volume: 4  |  Issue: 1  |  Page No.: 64 - 69

Oscillatoria sp. Bloom and the Occurrence of Microcystin in the River Buriganga, Dhaka, Bangladesh

Md. Sagir Ahmed, Md. Raknuzzaman and Sumaiya Ahmed    

Abstract: Potentially toxic cyanobacterial blooms are becoming common in the freshwater reservoirs in all regions of Bangladesh. The River Buriganga is a eutrophic urban river in the country and its water is utilized as drinking water supply and other recreational purposes. A bloom of Oscillatoria sp. occurred in the river Buriganga during May 2002. Bloom sample was collected and filtered through a glass fiber filter. Methanol-water extract of filtered cells were analyzed by High Performance Liquid Chromatography (HPLC) with UV, detection and Mass Spectrum (MS) detected Microcystin-RR. The concentration of microcystin RR was 0.235 μg L-1. As this river water is supplied to city dweller for drinking and other domestic usage there should have a regular monitoring system for cyanobateria blooms and microcystins to ensure the public health safety. To avoid the microcystins health risk to humans through drinking water, it is advised not to use this river water for drinking or any other domestic purposes until the provisional safety levels of microcystins are reported through the concerned authority.

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