I1 | I2 | I3 | I4 | |
As | −0.072 | −0.253 | 0.957 | −0.093 |
Cd | 0.457 | 0.735 | 0.089 | 0.214 |
Cr | 0.912 | 0.512 | −0.125 | 0.019 |
Cu | 0.543 | 0.073 | 0.611 | 0.231 |
Hg | 0.013 | 0.013 | 0.216 | 0.078 |
Pb | 0.647 | 0.815 | 0.028 | 0.978 |
Zn | 0.832 | 0.621 | −0.214 | 0.872 |
方差贡献率/% | 28.14 | 13.2 | 11.3 | 15.2 |
累积方差贡献率 | 27.38 | 62.1 | 55.7 | 81.6 |