Abstract
The aquatic vascular plant Eurasian watermilfoil (Myriophyllum spicatum L.) was investigated for its potential to take up Cd from nutrient-rich water in a short-term growth and harvest regime. Eurasian watermilfoil plants were grown in and harvested weekly from 0.10M Hoagland nutrient solutions containing concentrations of Cd from 0.04 to 7.63μg Cd mL−1. Dry weights of plants significantly decreas4ed when exposed to 7.63μg Cd mL−1. For both 0.04 and 1.03μg Cd mL−1 treatment the greatest concentration of Cd in plants occurred during the first two weeks. The greatest Cd concentration of Cd in plants for the 7.63μg Cd ML−1 treatment occurred during week one and decreased through week 2. Tissue P concentration in control plants increased over time but did not increase significantly over time when plants were exposed to 0.04 and 1.03μg Cd mL−1 levels. Tissue P concentration decreased over time when plants were exposed to 7.63μg Cd mL−1. Stem length, root dry weights, and root number significantly increased over time in control plants and in those exposed to the 0.04 and 1.03μg Cd mL−1 treatments. Plants treated with 7.63μg Cd mL−1 did not grow. These results suggest that Eurasian watermilfoil would be useful for absorbing Cd from nutrient-rich water when the solution concentration was in the range of 0.04 to 7.63μg Cd mL−1. However, in solutions having the highest concentration of Cd, the harvest regime would have to sustain plant vigor, avoid tissue Cd loss, and realize maximum uptake of Cd from solution.
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Sajwan, K.S., Ornes, W.H. Cadmium accumulation in eurasian watermilfoil plants. Water Air Soil Pollut 87, 47–56 (1996). https://doi.org/10.1007/BF00696828
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DOI: https://doi.org/10.1007/BF00696828