摘要
采用盆栽试验方法,通过添加赤泥颗粒修复铅锌污染土壤,按照火焰原子吸收分光光度法测定不同时期种植韭菜的土壤中重金属的含量,分析赤泥颗粒对土壤中重金属的钝化行为与机理,确定赤泥颗粒对土壤修复和对韭菜生长促进最佳的添加量。结果表明,赤泥颗粒能缓释OH-,促进重金属铅、锌化学形态转化和抑制生物吸收。铅、锌污染土壤修复的最佳赤泥颗粒添加量为5%,此时,土壤中铅、锌的生物有效态含量在修复期内分别降低了41.03%、26.55%;结合铅锌污染土壤修复与韭菜生长影响,初步确定赤泥颗粒的最佳施用量为1%,此时,土壤中铅、锌的生物有效态含量在修复期内分别降低了24.81%、15.9%;赤泥颗粒对铅锌污染土壤的修复能力大小为铅>锌。
Heavy metal pollution is one of the typical types of soil pollution.The main objective of the study is to analyse the passivation mechanism of granulated red mud to the heavy metals in soil and determine the best granulated red mud treatment in remediating soil contaminated with heavy metals that contribute to the growth of leeks.A treatment with granulated red mud addition was used to repair the soil which was polluted by Pb and Zn in incubation experiment.The concentration of heavy metals in soil（with and without leeks） at different stages and leeks were measured by flame atomic absorption spectrophotometer.Experiments indicated that granulated red mud could control the release of OH-,promote the transformation of heavy metals＇ chemical fractionation like Pb and Zn and inhibit biological absorption.The results showed that the optimal treatment with granulated red mud addition for remediation of lead-zinc contaminated soil was 5%,reducing the bio-available fraction of Pb and Zn in contaminated soil by 41.03% and 26.55% respectively during remediation time.In the combined remediation of lead-zinc contaminated soil and the effects of growth on leeks,the optimal treatment with granulated red mud addition for remediation of lead-zinc contaminated soil was 1%,thereby reducing the bio-available fraction of Pb and Zn in contaminated soils by 24.81% and 15.9 % respectively during remediation time.Repair capacity of granulated red mud to lead-zinc waste soil was：PbZn.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第2期289-294,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(50874046)
湖南教育厅科技项目(08A032)
关键词
重金属
钝化
生物有效态
韭菜
heavy metals
passivation
bio-available
leeks
