Possibility of enzyme activities as indicators of assessing soil compound contamination with cadmium，zinc and lead

The simulated test shows that the activities of cat alase，urease and alkaline phosphatase or invertase can reflect the contaminating levels of Cd，Zn，Pb and the effects of Cd-Zn or Zn-Pb interaction in the soil treated with Cd，Zn and Pb.It is possible that these enzyme activities can be used as a comprehensive system to assess the compound contaminating levels of Cd，Zn and Pb in the soil.