| More than 600 groups of forestland soil samples in Guangzhou were collected and tested, the correlation between As, Cr, Cd, Hg, Cu, Pb, Zn, Ni and magnetic properties was analyzed. The results showed that the soil magnetic particles were mainly soft magnetic minerals. Superparamagnetic and multi domain particles dominated in the north, single domain and multi domain particles dominated in the south. Multiple regression analysis showed that in the north， Cu, Ni, Cr, Cd were found in coarse magnetic particles, Cd was in soft magnetic minerals, As was in superparamagnetic particles and was natural sources. While in the south, there was no significant correlation, the sources of Ni and As were anthropogenic. The correlation coefficients of the regression equations of different pollution levels of soil were good. The regression equation of deep shallow soil in the south proved that the correlation between the above 8 elements and magnetic properties was not affected by natural sources or human activities. |
