RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2004, Vol. 13 >> Issue (1): 84-88.

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PRIMARY RESEARCH OF THE MICROCYSTIN'S FATE IN NATURAL AQUATIC SYSTEM

ZHANG Wei-hao(1), SONG Li-rong(2), XU Xiao-qing(2), LIU Yong-ding(2), ZHANG Xi-hui(1)   

  • Received:1900-01-01 Revised:1900-01-01 Online:2004-01-20
  • Contact: ZHANG Wei-hao

Abstract: Microcystins are hepatotoxin released by harmful toxic cyanobacterial bloom, are the potential risk factor of natural envi ronment and human health. MCLR has been listed as the special examining item in the newly published Environmental Quality Standard for the surface water. The paper investigated the seasonal variation of microcystin concentrations in lake Dianchi, where serious bloom has occurred in recent years. The concentration of microcystins has a range of 0.170.82 μg/L, which is far less than the amountin the cyanobacteria mass. The fate of microcystin in the lake was put forward on the base of absorption, photodegradation, and degradation experiments in site or in the laboratory. The results showed that the photodegradation was the main approach of the microcystins elimination.,while biodegradation, bioaccumulation, and adsorption had also contribution in reducing the concentration of microcystins in water.

Key words: natural aquatic system, microcystin, fate

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