Accumulation Characteristics and Health Risk Assessment of Heavy Metals in Soil-Corn in Typical Carbonate Rock in Central Shandong Province
Selecting typical carbonate rock high geological background area in central Shandong province as the research area,100 natural soil samples and 30 sets of corn plant and root soil matching samples have been collected.The content of eight heavy metals,including Cu,Pb,Zn,Cr,Cd,Ni,As,Hg and soil pH have been measured.The methods of geoaccumulation index,Nemero comprehensive pollution index,en-richment coefficient and health risk assessment model have been used to study the characteristics of heavy metal accumulation and health risk assessment.It is showed that the heavy metal content in the soil of the study area is higher than the background value of surface soil in Shandong province,and lower than the risk screening value of soil pollution in agricultural land.The median cumulative index of heavy metals in both natural soil and maize root soil is less than 0,and the degree of pollution is mainly non polluting.The Nemero Comprehensive Pollution Index shows that the soil is classified as clean.The enrichment ability of heavy metals varies in different parts of corn plants.Cu,Pb,Zn,Cr,Cd,Ni,As have the highest content in the roots,Hg has the highest content in the leaves,and Cr,Ni,and As are easily enriched in the roots.The content of Cu,Zn and Cd in the leaves and roots is equivalent,and the content of Zn in each part is relatively balanced.The heavy metal content in the seeds does not exceed the standard.The heavy metal hazard quotient and total hazard quotient caused by corn intake are both less than 1.It is indicated that planting corn in the carbonate rock area of central Shandong for residential consumption does not pose po-tential health risks.
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