Study On The Toxication Of Cadmium-zinc Compound Pollution To Zea Mays And Their Detoxification

Both the toxicity of cadmium-zinc compound pollution and cadmium-zinc detoxifying by sodium humate (Na~HA) were investigated in this study designed by even design project, in which different levels of cadmium, zinc and Na~HA were applied to soils. The results were showed as follows:1. The dry weight of the zea /aayswere decreased with the increase in the amount of cadmium or zinc applied. The effects by cadmium -zinc compound treatment on the amount of dry weight were not so significant as the total amount of dry weight by cadmium and zinc treated, demonstrating the anti-relation between cadmium and zinc.2. Compared with that without Na-HA treatment, zea mays treated with Na-HA had less content of heavy metals and higher dry weight, which showed that Na~HA has obvious detoxifying effects.3. When same amount of cadmium and zinc were added in soils, the exchangeable cadmium and zinc ions in the soils treated with Na-HA were lower than those without Na-HA treatment, indicating that the Na-HA could complicate with cadmium and zinc and made a reduction of the exchangeable cadmium and zinc ions in the soils.