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向模拟不同 Cd 污染程度的土壤样本添加不同剂量硝基腐植酸,及用去除法制备不同有机质含量的样本,测定土壤对 Cd 的缓冲性及 Cd 的形态。试验表明增加土壤有机质及硝基腐植酸含量可以增强土壤对 Cd 的缓冲性及提高土壤对 Cd 污染的抵御能力。缓冲机制主要为硝基腐植酸对 Cd 离子的络(螯)合作用。工业制风化煤硝基腐植酸可以作土壤重金属污染的改良剂。
Different dosages of nitro humic acid were added to soil samples simulated to different degree of Cd pollution, and samples with different organic matter content were prepared by removing method. The buffer properties of Cd and the shape of Cd were determined. Experiments show that increasing soil organic matter and nitric humic acid content can enhance the buffer of soil Cd and improve soil resistance to Cd pollution. The main buffering mechanism is the co-action of nitro humic acid (Cd) on the network. Nitric humic acid can be used as improver for soil heavy metal pollution.