Journal of Food, Agriculture and Environment

Studies on the impact of organic manures on the lead form and bio-availability of lead-polluted soil

Author(s):

Fangping Tong *, Gui Li, Zhenhua Liu

Recieved Date: 2013-06-30, Accepted Date: 2013-10-18

Abstract:

To explore the principles and effects of different organic manures on reducing Pb toxicity in heavy metal contaminated soil; use the test method of adding 3 kinds of organic manures through potting in heavy metal contaminated soil to analyze the five forms of heavy metal Pb in potting soil; except that the organic manure, i.e. dairy manure has no obvious significance on the iron and manganese oxides combined form and has obvious significance on the residual form of Pb, the organic manure, i.e. dairy manure has very significant effect on the ion exchange form, carbonate combined form and organic sulfide combined form. The organic manures, i.e. pig manure and chicken manure have very significant effect on the five forms of heavy metal Pb. Organic manures can reduce the ion exchange form content, carbonate combined form and biological activity of heavy metal Pb, and can increase the iron and manganese oxides combined form, organic sulfide combined form and residual form. Defined amount of pig manure enables the ion exchange form content and carbonate combined form of heavy metal Pb to reduce by 15.51 and 17.59%, respectively; enables iron and manganese oxides combined form, organic sulfide combined form and residual form to increase by 46.51, 46.34 and 7.46%, respectively; and enables biological activity to reduce by 11.44%. Defined amount of chicken manure enables the ion exchange form content and carbonate combined form of heavy metal Pb to reduce by 20.96 and 11.42%, respectively; enables iron and manganese oxides combined form, organic sulfide combined form and residual form to increase by 53.31, 38.52 and 40.65%, respectively; and enables biological activity to reduce by 14.81%. Defined amount of dairy manure enables the ion exchange form content and carbonate combined form of heavy metal Pb to reduce by 25.57 and 26.93%, respectively; enables iron and manganese oxides combined form, organic sulfide combined form and residual form to increase by 19.19, 34.36 and 14.57%, respectively; and enables biological activity to reduce by 11.78%. The effects of the three kinds of organic manures on reducing Pb toxicity in heavy metal contaminated soil are as follows: chicken manure>dairy manure>pig manure. Organic manures have changed the Pb form in polluted soil and reduced the biological activity of Pb. Thus, organic manures are effective ameliorants of heavy metal contaminated soil.

Keywords:

Organic manures, heavy metal forms, bio-availability, heavy metals

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2232-2236

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