文献阅读问题答案.docx

Revised on November 25, 2020
文献阅读问题答案
文献阅读问题
Introduction
1. How do heavy metals entry the soils
Answer the difference between specific adsorption and non-specific adsorption.
Answer: In general terms, non-specific adsorption is a process in which the charge on the ions balances the charge on the soil particles through electrostatic attraction, whereas specific adsorption involves chemical bond formation between the ions in the solution and those in the soil surface.
3. Please tell us the relationship between bioavailability of heavy metal and soil
physicochemical property
Answer: Bioavailability of heavy metal are effected by a number of factors including temperature, steric factors and concentration. All these interactions are controlled by solution pH and ionic strength, the nature of the metal(loid) species, dominant cation, and inorganic and organic ligands present in the soil solution
4. When does the precipitation appear to be the predominant process
Answer: Precipitation appears to be the predominant process in high pH soils and in the presence of anions such as SO42, CO32, OH, and HPO42, and when the concentration of the heavy metal(loid) ion ishigh .
5. What is co-precipitation Can you give an example.
Answer: Co-precipitation of metal(loid)s especially in the presence of iron oxyhydroxides has also been reported and often such intera