The content of heavy metals in the dust in an industrial park of Baoji City was measured by X-Ray fluorescence spectrometry and Atomic fluorescence spectrometry.The results showed that the content of As

Co

Cr

Cu

Hg

Mn

Ni

Pb and Zn was 23.3

16.4

1591.8

178.2

0.243

346.5

40.2

1586.2and 1918.8mg/kg

respectively

of which Cr

Cu

Hg

Pb and Zn accumulated largely and the contents of As

Cu

Hg

Pb and Zn in the dust around lead-zinc smelting plant were higher than that around coal-fired power plant.Analysis on the forms of the heavy metals in the dust by modified BCR (from European Community Bureau of Reference)and AAS(atomic absorption spectrophotometry)indicated that Cu mainly existed oxidizable in residual

Pb reducible

Zn extractable in the acetate acid

Mn and Co rich in residual and extractable in the acetate acid

Ni and Cr mainly the residual.Pb

Zn

Co

Mn and Zn were easy to move and harmfully utilized by living things.Assessment of potential ecological risk demonstrated that the pollution of heavy metals in the dust and its potential ecological reached to the serious level with that around Pb-Zn smelting plant more severe than coal-fired power plant.