| Concentrations of lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), zinc (Zn) and manganese (Mn) were
measured in various organs (such as hepatopancreas and muscle) from 9 species of freshwater economic fishes which were
collected from northeast area of Guangdong province. The concentration of metals was measured by inductively coupled
plasma atomic emission spectrometry (ICP-AES). Results showed that the levels of metals in hepatopancreas of the fishes
were had the order of Zn >Pb >Cu >Hg >Cd, while in muscles were Zn >Cr >Pb >Mn >Cu >Cd. In general, the metals
concentrations were significantly higher in hepatopancreas samples than those in muscle samples. The result of pollution
index of single factor shoued that, the fishes, to one degree or another, were polluted by Pb, Cd, Cr, Cu and Zn, and
pollution levels were mostly followed by Pb>Cd>Cr>Cu>Zn. The indexes of Pb and Cd tested in hepatopancreas of the
fishes were in a majority exceeded the national safety criteria for food in China. What爷s more, the contents of the heavy
metals in fishes did not vary with the trophic level. In summary, the fishes were polluted by Pb, Cd, Cr, Cu and Zn to some
extent, which indicated that hidden danger of heavy metals pollution was present in ecological environment or fishery
production in the area. |
