土壤pH、水分及温度对长期污染土壤中苯并[a]芘动态变化的影响初探  

An Approach to Effects of Soil pH,Moisture and Temperature on Dynamics of Benzo[a]pyrene in Long-term Contaminated Soil

作　　者：付登强[1,2] 滕应[1] 骆永明[1,2] 孙明明[1,2] 李士杏[1,2] 李振高[1] 

机构地区：[1]中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100049

出　　处：《土壤》2012年第3期444-449,共6页Soils

基　　金：国家高技术研究发展计划(863计划)项目(2007AA061101);中国科学院知识创新工程项目(KSCX2-YM-G071);江苏省自然科学基金项目(BK2009016)资助

摘　　要：以受多环芳烃长期污染农田土壤中苯并[a]芘(B[a]P)为研究对象,采用室内模拟试验研究了pH、水分和温度对土壤中B[a]P的动态变化的影响。结果表明,供试污染土壤中B[a]P能被土著微生物快速去除,其消减过程受到pH、水分和温度的影响。初始pH为4.6、5.9和7.3的泥浆中B[a]P在7天内的去除率分别为43.8%、37.8%和14.0%。在土壤水分为22%、43%、65%和87%田间持水量,温度为28℃条件下培养80天后土壤中B[a]P的去除率分别为42.5%、96.6%、96.3%和34.3%。在土壤pH为4.5,土壤水分为60%±5%田间持水量,温度为25℃和40℃条件下土壤中B[a]P的半衰期分别为33天和16天。可见,pH、水分和温度等环境条件对土壤中B[a]P的消减过程具有明显的影响,可通过人为调控强化B[a]P污染土壤的生物修复。The effects of soil pH,soil moisture and environmental temperature on the dynamics of benzro[a]pyrene（B[a]P） in long-term contaminated farm land soil were investigated by indoor cultivation.The results showed that B[a]P in soil could be degraded by indigenous microorganisms and the process was influenced greatly by soil pH,soil moisture and environmental temperature.B[a]P in soil was degraded by 43.8%,37.8% and 14.0% respectively within 7 days＇ slurry reaction under the conditions of initial pH values of 4.6,5.9 and 7.3.B[a]P degradation rates were 42.5%,96.6%,96.3% and 34.3% within 80 days＇ incubation under 28℃ with soil moisture of 22%,43%,65% and 87% of field water capacity（FWC）.The half-time of B[a]P in soil were 33 days and 16 days under the environmental temperature of 25℃ and 40℃,while soil pH was 4.5 and soil moisture was 60% ± 5% of FWC.Therefore,environmental conditions such as soil pH,soil moisture and environmental temperature affected the biodegradation of B[a]P in soil greatly and the degradation of B[a]P could be enhanced by environmental regulation.

关 键 词：土壤 苯并[A]芘 PH 水分 温度 

分 类 号：X53[环境科学与工程—环境工程]