一种重金属污染土壤改良剂的研究

为了降低粤北大宝山矿区周边种植区重金属污染土壤的植物毒害作用,以不同条件下土壤中有效态铜、锌、锰含量作为评价指标,依次采用单次-单因子法筛选出有效的改良剂原料,采用L16(45)正交试验研究了改良剂的最佳配方,并进行了作物种植试验,得到最适改良剂配方为0.30%熟石灰粉、0.20%花生壳粉、0.20%草木灰、0.02%Na2EDTA,玉米和油菜在改良土壤中的多项生长指标均较原土壤中的提高30%以上,表明该改良剂能有效地降低土壤中重金属对农作物的毒害作用,并且改良土壤以适于玉米和油菜生长。

Study on a Modifier for Heavy Metal Contaminated Soil

In order to decrease the toxicity of the heavy metal contaminated soil on plant in the growing fields around Dabao mountain mine area of northern Guangdong Province,the exchangeable heavy metal concentrations of copper,manganese and zinc in soils were used as evaluation indicators of modification effect.The effective materials in the modifier were selected by one factor at one time and the formula of the soil modifier was studied by L16(45) orthogonal experiment.The crop experiments were carried out with corn and rape.The results showed that the optimum formula of the soil modifier was 0.30% white lime powder,0.20% peanut shell powder,0.20% plant ash and 0.02% Na2EDTA and the multiple parameters for these two crops growth were enhanced over 30% in the improved soil than those in the original soil.So this modifier could reduce the toxicity of heavy metals on crops effectively and the improved soil was suitable for crop and rape growth.