 BackShort Report ScienceAsia 23 (1997): 371-380 |doi: 10.2306/scienceasia1513-1874.1997.23.371 THE POTENTIAL OF USING EICHHORNIA CRASSIPES AND IPOMOEA AQUATICA AS BIOMONITORS IN ASSESSING HEAVY METAL POLLUTION IN THE MAE KHA CANAL AND THE MAE PING RIVER IN CHIANG MAI, NORTHERN THAILANDZHENBO YANGABSTRACT: Floating aquatic plants samples water hyacinth (Eichhornia Crassipes) and water morning glary (Ipomoea Aquatica) from the Mae Kha Canal and the Mae Ping River were collected at the ends of rainy and dry seasons in 1994. Plant samples were dried, ground, digested and finally analysed by atomic absorption spectrophotometry. The results showed that there is a great accumulation of Cd, Cu, Pb and Zn in both Eichhornia crassipe and Ipomoea aquatica, with a higher ratio in the former than in the latter. Institute of Environmental Health Monitoring Chinese Academy of Preventive Medicine, 7 Pan Jia Yuan Nan Li, Beijing 100021, P.R.China. Received 3 July 1997
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