Abstract:
This paper is the result of environmental geological survey engineering.
Objective To provide a scientific foundation for soil pollution risk management and remediation, the relationship between soil cation exchange capacity and the buildup of heavy metals in wheat grains was investigated.
Methods Regression models linking soil cation exchange capacity to the bioaccumulation coefficients of heavy metals such as cadmium, arsenic, copper, lead, and zinc were developed at the 0.05 level using soil cation exchange capacity classification treatment and multivariate statistical analysis techniques based on extensive collaborative monitoring data for soil and wheat in an area with high concentrations of heavy metals in the surface soil of Hebei Province's central plain.
Results yCd=6.53+66.39×e−x/4.61, yAs=0.78−0.02x , yCu=6.78+40.51×e−x/6.15, yPb=0.21+1.79×e−x/3.62, yZn=19.44+65.64×e−x/6.36. The goodness of fit was good, and the corrected multiple correlation coefficients were 0.95, 0.95, 0.99, 0.83, and 0.96, respectively.
Conclusions The findings showed that soil organic matter and the percentage of clay in the mechanical composition were significant determinants of soil cation exchange capacity and may be crucial when they take center stage. The accumulation of heavy metals, including cadmium, copper, zinc, lead, and arsenic, in wheat grains can be efficiently reduced by increasing soil cation exchange capacity. However, the decline in soil metal buildup in wheat grains gradually or dramatically slows as soil cation exchange capacity rises above a particular threshold. In the research region, cadmium, copper, zinc, and lead accumulation in wheat grains were affected by soil cation exchange capacity thresholds of 13.89 cmolc/kg, 13.72 cmolc/kg, 17.05 cmolc/kg and 15.06 cmolc/kg, respectively.
下载: