摘要
采用田间调查采样、室内分析测定的方法,研究了制革污泥污染土壤矿化过程中Cr(Ⅲ)和N的释放。结果表明,制革污泥污染土壤中高浓度Cr(Ⅲ)可导致作物各部位Cr的大量积累,小麦、玉米子粒中Cr含量远远超过安全食用标准;Cr(Ⅲ)向土壤底层的迁移可达160cm,并与有机物迁移具有显著相关性。14周好气培养实验显示,矿化结束后,污泥中14%～26%以上有机态Cr(Ⅲ)转化为无机态,具有很高的迁移性和生物有效性;由污泥带入土壤中的氮与土壤原有N的矿化速率和可矿化N量具有明显差异,Cr(Ⅲ)的转化与N的矿化具有显著相关性。
A contaminated soil by tannery sludge was investigated to assess Cr tran sfer and accumulation in wheat and ma ize.It has been found that Cr (Ⅲ)transferred down to the depth of 160cm of the soil,and its contents were significantly correlated with organi c matter contents along the soil profile.Cr concentrations in crop seeds e xceeded the hygienic standard of Chi na for food.Amended and unamended soils were incubated aero bically for 14weeks at(30±1)℃and soluble Cr (Ⅲ)and nitrogen were monitored.The re-sults showed that 14%～26%of Cr (Ⅲ)in the sludge was transformed from organic form into inorganic form.Furthermore,the N mineralization rates and potential derived fromthe sludge had signific antly difference fromthe soil N.The release rates of Cr (Ⅲ)and N showed a significant correlation
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2004年第1期136-139,共4页
Journal of Agro-Environment Science
基金
联合国工发组织资助项目(ProjectNo.US/CPR/97/022)
污染控制与资源化研究国家重点实验室开放课题
