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In this study, the aquatic macrophyte Ceratophyllum demersum L. (coontail or hornwort) was tested for its efficiency of arsenic (As) uptake under laboratory conditions. Our results revealed that the solution pH had a significant effect on As accumulation by C. demersum (p<0.001). The accumulation was highest at pH 5 and decreased as pH values increased. Plants that were exposed to various concentrations...