Effects of Fly Ash Heavy Metals on 'Daphnia magna'

摘要

The purpose of this study was threefold: (1) To analyze the concentrations of heavy metals released from two different fly ashes in alkaline Missouri waters and their effect on the pH; (2) to determine the LC50 and the chronic toxicity concentrations of fly ash that killed or impaired the reproductive capacity of Daphnia magna; and (3) to study the possible bioaccumulation of cadmium from fly ash by D. magna. Results of acute toxicity tests with D. magna indicated that older daphnids tolerated higher concentrations of fly ash better than did juveniles. Unfed adults were more susceptible to the effects of fly ash from Illinois coal than were fed ones. The fly ash from the western coal affected both juveniles and adults very differently from the Illinois ash.