A batch experiment of the heavy metals contaminated soil with HCl

citric acid and EDTA was conducted to investigate removal of Pb

Cd

Cu and Zn by soil washing

and to explore the effects of soil washing on nutrient elements in the heavy metals contaminated soil.The results showed that soil washing effectively removed heavy metals

and that

in the same time

soil washing resulted in the loss of K

Ca

Mg

Fe and Mn

and decreased the availabilities of some nutrient elements in the heavy metals contaminated soil.The removal power of EDTA on heavy metal was much better than that of HCl and citric acid. The loss of K

Ca

Mg due to extracting of HCl was more than citric acid and EDTA.The loss of Fe due to extracting of citric acid was more than HCl and EDTA.The loss of Mn due to extracting of EDTA was more than HCl and citric acid.The extracting of HCl and citric acid decreased availabilities of K

Ca

Mg in the soil.The extracting of EDTA increased availabilities of K

decreased availabilities of Ca

and

in the high concentration(50 mmol/L)

decreased the availabilities of Mg in the soil remarkably.The availabilities of Fe in the soil increased through extracting of three extractants

and the effect of EDTA was the most significant.In lower concentration

these 3 extractants could all increase the availabilities of Mn

and the effect of citric acid was the most significant.With increasing in the concentration of extractants

the availabilities of Mn decreased a little.