سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۱۰

نویسنده(ها):

Mojtaba Mehrabanian – Student of University of Tehran,Tehran,Iran
Gh.R. Savabeghi-Firoozabadi – Assistant Prof. Soil Science Department ,University of Tehran, Tehran, Iran

چکیده:

Heavy metal contamination afects large areas of Iran and worldwide. Hot spots of pollution are located
close to industrial sites, around large cities and in the vicinity of mining and smelting plants. Agriculture in
these areas faces major problems due to heavy metal transfer into crops and subsequently into the food chain.
This paper gives an overview on simple but efective countermeasures to reduce the uptake of heavy metals
by food crops. Since crop species and varieties largely difer in their heavy metal uptake, choosing plants with
low transfer factors (e.g., legumes, cereals) may reduce metal concentration in edible parts signifcantly. The
application of soil amendments is another very efective measure to reduce the concentration of heavy metals
in crops. Both organic (e.g., farmyard manure) and inorganic amendments (e.g., lime, zeolites, and iron
oxides) were found to decrease the metal accumulation. Further efective methods to reduce metal transfer into
food chain include crop rotation and cultivation of industrial or bio-energy crops. It is concluded that the
methods presented here comprise several tools, which are easy to apply, and are efective to allow safe
agriculture on moderately contaminated soils.