Huan Jing Ke Xue. 2026 Feb 8;47(2):1283-1292. doi: 10.13227/j.hjkx.202412162.
ABSTRACT
In order to study the current situation and sources of heavy metal pollution in Zhangbei County， Bashang Grassland， 69 surface soil samples， 16 ancient weathering crust soil samples， and 35 rock samples were collected to test and analyze the contents of eight heavy metals such as Cd， Pb， Hg， Zn， Cu， As， Cr， and Ni. The enrichment factor method and potential ecological risk index method were used to study the characteristics of heavy metal enrichment and ecological risk assessment. Multivariate statistical analysis and the positive matrix factorization （PMF） model were combined to analyze the sources of heavy metals in the soil. The results showed that the average content of eight heavy metal elements in the soil of the study area was lower than the screening value for soil pollution risk in agricultural land and the average content of surface soil in Hebei Province. Only Cd showed slight enrichment in heavy metals， while the rest of the heavy metal elements were not enriched overall. The potential ecological risks of a single indicator were ranked from high to low as follows： Cd>Hg>Pb>As>Ni>Cu>Zn>Cr. The comprehensive index of potential ecological risks showed that the study area was mainly mild， with only two samples reaching a moderate risk level， and the main contributing factors were Cd and Hg. The results of multivariate statistical analysis and PMF model source analysis indicated that heavy metals in the soil of the study area were mainly controlled by the weathering of the parent rock. The high-value areas of Cr， Ni， Cu， Zn， and Cd were mainly controlled by the basalt parent rock， while the high-value areas of Pb and As were mainly controlled by parent rocks such as detrital rocks and granite. Hg was a composite pollution source of multiple factors such as coal burning， atmospheric dust deposition， and parent rock weathering. As， Cr， Pb， and Zn were also affected by industrial activities， agricultural activities， transportation， and household waste.
PMID:41657182 | DOI:10.13227/j.hjkx.202412162
