There were positive correlations among V, Mn, Co, Ni, and Cr concentrations, as well as among Cu, Pb, Zn, Sb, Cd and Hg concentrations.

• V、Mn、Co、Ni、Cr含量之间均呈极显著正相父; Cu、Pb、Zn、Sb、Hg、Cd含量之间也均呈极显著正相关。