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Coontail (Ceratophyllum demersum L.) plants when exposed to various concentrations of Pb (1–100μM) for 1–7days, exhibited both phytotoxic and tolerance responses. The specific responses were function of concentration and duration. Plants accumulated 1748μgPbg −1 dw after 7d which reflected its metal accumulation ability, however most of the metal (1222μgg −1 dw, 70%) was accumulated...
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