鱼骨粉对土壤Cd污染钝化修复效应及其理化性质的影响

通过1年静态培养试验,研究了鱼骨粉对碱性和酸性Cd污染土壤钝化修复效应、基本理化性质和酶活性的影响。结果表明:随着鱼骨粉施加量的增加,酸性和碱性土壤中pH、有机质和阳离子交换量增加,而含水率则较对照降低了2.90%～6.19%和0.10%～1.81%。土壤中TCLP(toxicity characteristic leaching procedure)提取态Cd含量随鱼骨粉投加量增加而降低,较对照最大分别降低49.7%和17.0%。施加鱼骨粉后,碱性土壤中过氧化氢酶活性显著升高(p0.05),过氧化物酶则受到抑制,脲酶活性仅在≤1%鱼骨粉处理时有所促进,而在酸性土壤中,过氧化氢酶、过氧化物酶和脲酶活性最大分别可增加90.5%,65.4%,75.8%。施用鱼骨粉改变了土壤有机碳官能团的数量,其中酚类化合物、脂肪C、芳香C官能团含量均有所增加。土壤中有效态Cd与土壤有机质含量、过氧化氢酶活性呈极显著负相关关系(p0.01),与土壤pH、阳离子交换量呈显著负相关关系(p0.05)。研究表明利用鱼骨粉钝化修复Cd污染土壤较为有效可行。

Effect of Fish Bone Meal on Immobilization Remediation of Cadmium Contaminated Soil and Its Physiochemical Properties

One-year static cultivation experiments were conducted to investigate the effects of fish bone meal on immobilization remediation of cadmium (Cd), basic physiochemical properties and enzyme activities in acid and alkaline Cd contaminated soils. The results showed that with the increasing of fish bone meal amount, the pH, organic matter and cation exchange capacity increased in acid and alkaline soils, while the water content decreased by 2.90%~6.19% and 0.10%~1.81% compared with the control. The extractable Cd content of the TCLP (toxicity characteristic leaching procedure) in soil decreased with the increasing of fish bone meal, which decreased by 49.7% and 17.0% at most, respectively, when compared with the control. After the addition of fish bone meal to alkaline soil, the activity of catalase increased significantly (p<0.05), while the peroxidase activity was restrained, and the urease activity was promoted only under the treatment of addition fish bone meal less than 1%. However, in the acid soil, the activity of catalase, peroxidase and urease increase by 90.5%, 65.4% and 75.8% at most, respectively. The number of organic carbon functional groups was changed after applying fish bone meal, and the content of phenolic compounds, aliphatic C and aromatic C increased. The content of available Cd in soil was extremely negatively correlated with the organic matter content and the catalase activity (p<0.01), and it was obviously negatively correlated with pH and cation exchange capacity (p<0.05). Therefore, using fish bone meal was efficient for remediation of Cd contaminated soil.