苯并[a]芘和二苯并[a,h]蒽的土壤降解特性及其影响因素  

Degradation Characteristics of BaP & DBA in Soils and the Impact Factors.

作　　者：李春玉[1,2] 石利利[1] 单正军[1] 孔德洋[1] 

机构地区：[1]环境保护部南京环境科学研究所／国家环境保护农药环境评价与污染控制重点实验室,江苏南京210042 [2]南京农业大学资源与环境科学学院,江苏南京210095

出　　处：《生态与农村环境学报》2008年第4期83-86,共4页Journal of Ecology and Rural Environment

基　　金：国家重点基础研究发展计划(2002CB410805);上海市科技局项目(06dz05810)

摘　　要：实验室条件下,研究了不同土壤性质、水分含量、通气条件、外加营养元素比例与外源微生物等条件下,苯并[a]芘(BaP)和二苯并[a,h]蒽(DBA)在土壤中的降解特性。结果表明,当土壤中BaP和DBA的添加水平分别为2.5mg·kg-1时,至125d时,BaP在pH较低的江西红壤中降解最快,降解率达87.3%;而DBA在有机质含量较高的中性太湖水稻土中降解较快,降解率为52·0%。土著微生物对BaP和DBA在土壤中的降解起重要作用;合适的土壤C/N比值能明显加快降解速率;好气条件有利于BaP和DBA的降解。Under laboratory conditions,the degradation characteristics of BaP and DBA in soils were studied.Four kinds of soil,loam soil from Shanghai,red soil from Jiangxi,black soil from Northeast China and Taihu Lake paddy soil from Jiangsu were used for the study.Results indicate that the degradation reaction of BaP and DBA was slow in the four soils.The organic matter content and pH of soils have an obvious influence on their degradation.When the added concentration of BaP and DBA was 2.5 mg·kg^-1,BaP degraded quickly in the acidic Jiangxi red soil 125 days after the application,the degradation rate reached to 87.3%.DBA degraded quickly in the neutral Taihu Lake paddy soil,with high content of organic matter,the degradation rate reached to 52.0% 125 days after DBA application.The bio-degradation of BaP and DBA in the four soils was mainly induced by indigene micro-organism.Suitable C/N ratio speeded up BaP and DBA degradation.Aerobic condition is also favorable to such degradation.

关 键 词：多环芳烃 苯并[A]芘 二苯并[a h]蒽 土壤降解 

分 类 号：X53[环境科学与工程—环境工程]