METHOD FOR ESTABLISHING A FITTING MODEL FOR EXTRACTING A HEAVY METAL FROM SOIL WITH A LOW MOLECULAR WEIGHT ORGANIC ACID

Abstract The present invention discloses a method for establishing a fitting model for extracting a heavy metal from soil with a low molecular weight organic acid, comprising: collection, air drying and sieving of soil samples; preparation of low molecular weight organic acid standard solutions; extraction of a heavy metal from soil with a low molecular weight organic acid and detection; establishing a model for extracting a heavy metal from soil with a low molecular weight organic acid; and determination of an organic acid concentration threshold at the maximum extraction amount of heavy metal from soil. The present invention can quantitatively characterize the ability of low molecular weight organic acids to extract heavy metals from soil, and the extraction results of different soils are comparable. The present invention has a short experiment period and low cost, which facilitates the promotion. The method of the present invention is not restricted by any time and place conditions, can be performed in a laboratory, and has good controllability. The method of the present invention can determine an organic acid concentration threshold for extracting heavy metal from soil, and is applied to the remediation of heavy metal contaminated soils in farmland with good operability and low cost, and is well worth promoting.