风化煤对碱性土壤中重金属镉、铅有效态的影响

采用盆装污染土,研究了不同来源、不同用量风化煤处理对Cd,Pb单一污染和混合污染土壤有效态的影响。结果表明,风化煤对Cd,Pb有效态的去除率很高,对各污染土壤中有效态Cd的去除率达到49.8%～79.7%,有效态Pb的去除率达到26.3%～39.6%。2种重金属的去除呈现不同的变化过程,Cd的有效态含量,先是大幅下降后又小幅回升,而Pb为持续下降。pH则随着风化煤的投入呈现持续下降趋势,幅度在0.41～0.71之间。比较各处理的去除率得出,2号风化煤的10g/kg处理修复效果最好,也最稳定,对Cd的去除率达到60%左右,对Pb的去除率达到33%左右。

Effects of Weathered Coal to the Availableness State of Heavy Metals Cadmium and Plumbum in the Alkaline Soil

Using the contaminated soil in pots, the impact of the different sources and different amount of weathered coal on the availableness state of Cd and Pb in contaminated soil was studied. The results show that the weathered coal on the removal state of the available Cd and Pb was high, reaching up to 49.8% - 79.7% and 26.3% - 39.6% in the contaminated soil respectively. Removal of heavy metals in the course of two different processes showed the availble state content of Cd was first significant decline then a slight rebound, Pb for the continuing decline, pH downward trend continued with the weathered coal input, range between 0.41 - 0.71, on the available state of Cd, Pb removal rate had different effects. The removal rate of 2nd weathered coal of 10 g/kg was the best repair and the most stable, the removal of Cd about 60%, Pb of about 33%.