Study on Nutrient Element Loss in Heavy Metal Contaminated the Soil Soil after EDTA and CA Compound Washing Remediation
In practice,Na2EDTA and CA are economical and effective leaching reagents.However,the evaluation of remediation result is just based on the concentration of the target pollutant,which cannot truly reflect the loss of nutrients.This paper focused on treating the heavy metal contaminated farmland soil.It took the best conditions of Na2EDTA and CA to carry out a series of experiments,to explore the loss-degree of nutrients in after-leaching soil.The results showed that the soil leaching technology can effectively remove Zn,Pb,Cd.At the same time,there are still elution effects on the five mineral elements.The elution rate was in the order of Ca>Mn>Fe>K>Mg,which was 60.1%,44.8%,18.0%,14.5%,and 5.98%,respectively.The soil leaching technology can the availability of mineral elements.The leaching of EDTA and CA increased the availability of Mg,Fe,and Mn and reduced the availability of K and Ca in the soil.The leaching and remediation technology also resulted in a significant change in pH from 8.03 down to 4.56.The content of nutrients in the soil showed a decreasing trend after leaching.The total phosphorus loss rate was the highest,followed by the available phosphorus.The loss of total nitrogen and basic nitrogen is minimal.The loss rates were 57.8%,45.9%,25.6%,and 17.0%,respectively.
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