Uptake of Heavy Metals by Vegetables and Estimation of Guidelines for Health Risk to Heavy Metals in Vegetable Plantation Soil in Acid Rain Area
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    Abstract:

    Pot experiments were actualized to investigate uptake and bioconcentration of heavy metals(Cu,Zn,Pb,Cd,Cr and Ni) in Pak-choi(Shanghaiqing),Pe-tsai and Radish under the influence of simulated acid rain.Compared to the control,the soil treated with simulated acid rain and heavy metals significantly enhanced the content of Cu,Pb,Cr and Ni in the vegetables,and generally,increased the content of Zn and Cd only under condition that the added Zn or Cd in the soil was quite high.Acid rain and heavy metal compound pollution makes bioconcentration factors(BCF) of Pb and Ni increased,Cu increased and Cd descended in the most cases,and BCF of Zn and Cr appear obvious difference among various vegetables.BCF of some heavy metal in various vegetables appears Radish > Pak-choi > Pe-tsai,and BCF of heavy metals in some vegetable appears Zn > Cd > Ni > Cu > Pb > Cr.Correlation coefficient between the total content of some heavy metal in the soil and its content in the vegetables attains a significant or a very significant level.Guidelines for health risk to heavy metals in the vegetable plantation soil was estimated according to BCF of heavy metals in Pak-choi,Pe-tsai and Radish.These results are important to develop environmental capacity assessment,and to draw remediation goal of soil heavy metals pollution and parochial soil ambient quality standards.

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