Cadmium uptake by the water hyacinth: Effects of solution factors

摘要: Abstract Factors affecting Cd +2 uptake by the water hyacinth Eichhornia crassipes were examined. A radiotracer (Cd-109) was employed to monitor uptake. constant amount of used in every experimental solution resulting a comparable sensitivity throughout concentration range studied (0·0001–1000 ppm). Concentrations above 100 ppm acutely toxic plants. biphasic rate observed with fast phase about 4 h and slow at least 72 h. Stirring enhanced phase, suggesting that is part diffusion limited. Increasing pH from 2 5 rate. When Hoagland's present, higher values decreased The presence micronutrient Zn These metals appear compete for same site(s) on roots. Plants sequentially exposed (three times; 48 each) different concentrations continued take up metal exhibit profile. removed after did not release any when placed fresh solution.