Study on the enrichment patterns of Pb, Cd, Cr and Hg in water hyacinth in different water areas

The patterns of water hyacinth absorbing 4 heavy metals (Pb, Cd, Cr and Hg) in different water areas were studied and the tested water hyacinth and water samples were collected from 8 different water areas in Zhejiang Province through atomic absorption spectrometry and atomic fluorescence spectrometry. The results showed that the contents of heavy metals in water and water hyacinth were high in the seriously polluted water areas. The contents of Pb and Cd in water samples were significantly higher than those of Cr and Hg (P0.05). The contents of heavy metals in roots were generally higher than in those in stem and leaf of water hyacinth. Cd content was significantly lower than Cr in stem and leaf (P0.05) and it was similar in root but the difference was not significant (P0.05). Under the lab conditions, the contents of Pb and Cd in root, stem and leaf showed an increasing trend with the increase of heavy metal contents in water.