Abstract:
This paper is the result of environmental geological survey engineering.
Objective The relationship between soil cation exchange capacity (SCEC) and the buildup of heavy metals in wheat grains is investigated to provide a scientific foundation for soil pollution risk management and remediation.
Methods SCEC classification treatment and multivariate statistical analysis techniques was integrated to extensive collaborative monitoring data for soil and wheat in an area with high concentrations of heavy metals in the surface soil of the Central Hebei plain.
Results Regression models linking SCEC to the bioaccumulation coefficients of heavy metals such as cadmium, arsenic, copper, lead, and zinc were developed at the 0.05 level: yCd=6.53+66.39e−x/4.61, yAs=0.78−0.02x, yCu=6.78+40.51e−x/6.15, yPb=0.21+1.79e−x/3.62, yZn=19.44+65.64e−x/6.36. The goodness of fit was good, with the corrected multiple correlation coefficients of 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. Increasing the SCEC can efficiently reduce the accumulation of heavy metals, including Cd, Cu, Zn, Pb, As. And etc. in wheat grains. However, when the SCEC reaches or exceeds a particular threshold, a declining trend of soil metal buildup in wheat grains will gradually or dramatically slow down as the SCEC rises. In the research region, Cd, Cu, Zn, Pb, and As accumulation in wheat grains are 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.
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