摘要
有机污染物进入土壤后,随着与土壤接触时间的延长,被锁定在土壤中,生物可利用性下降.锁定可能导致过高估计难降解有机污染物的暴露风险,影响修复技术的实施.锁定发生的内在机制主要源于粘土矿物、有机质及非水相液体的不可逆吸附和微孔束缚,而影响土壤难降解有机污染物锁定的关键因素包括土壤物理化学性质和环境条件(湿度、温度、pH等).基于此,进一步阐明了目前土壤中难降解有机污染物锁定机理研究需要解决的问题,并对未来的发展趋势进行了展望.
After entering into soil, organic contaminants often become increasingly less available to a variety of organisms and to non-vigorous extraction by organic solvents. This time-dependent reduction in availability results from the molecules sequestration by soil. Because of the sequestration, the exposure risk of hard biodegradable organic contaminants in soil may be overestimated, and the available remediation technologies are assessed incorrectly. The inherent mechanisms of the sequestration are the irreversible adsorption by clay minerals, organic matters and nonaqueous-phase liquids and the entrapment by micropores, while the key factors affecting the sequestration are the physicochemical characteristics of soil, properties of hardly biod.egradable organic contaminants, and environmental conditions, e.g. , moisture, temperature, pH and so on. Some critical problems in sequestration mechanisms study were pointed out, and the developing trend in this research field was prospected.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第7期1624-1630,共7页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目(2004CB418506)
辽宁省博士后基金资助项目.
关键词
难降解有机污染物
锁定
生物可利用性
hardly biodegradable organic contaminant
sequestration
bioavailablity
