摘要
在天津市北部山区、中部农田和东南部油田采油作业区分别采集了土壤样品 ,研究了土壤中多环芳烃 (PAHs)的纵向分布特征 ,并对土壤中多环芳烃的来源进行了分析 .结果表明 ,PAHs含量峰值一般位于土壤表层或次表层 ,并随着土壤剖面的加深而减少 .农田菜地土壤PAHs在 4 0cm深处含量仍然较高 ,而油田仅表层 3cm富集PAHs ,这与耕作土壤表层常受到人为扰动有关 .与高环物质相比 ,低环物质更容易向下迁移 .土壤中有机碳的含量、土壤的性质以及土壤的粒度均是影响PAHs迁移的重要因素 .山区和菜地土壤中PAHs主要来自燃烧源 ,而油田则显示为石油源和燃烧源的混合源 .
Soil samples were collected in the mountainous areas, agricultural land and oil fields in Tianjin. Vertical distributions of polycyclic aromatic hydrocarbons (PAHs) in soils were investigated in this paper. The sources of PAHs were also analyzed. The total concentrations of 16 prior PAHs was found to have peak at or just below the soil surface and declined with depth. High PAHs concentrations were found in 0～{40?cm} in agricultural soil, while PAHs were only enriched in 0～3?cm in oil field soils. It is estimated that this is caused by the long-term cultivation in the agricultural areas. Low ring PAHs transformed easier than high ring PAHs in the soil. Soil properties (e.g. Total organic carbon, clay content) played major roles in the vertical distribution of PAHs. PAHs in mountainous areas and agricultural soils were mainly derived from precipitation of pollutants caused by the combustion of fossil fuels, while PAHs in oil field soil were originated from both petroleum and combustion contamination sources.
出处
《环境科学学报》
CAS
CSCD
北大核心
2004年第2期286-290,共5页
Acta Scientiae Circumstantiae
基金
国家自然科学基金 (40 332 0 15 )
国家重点基础研究专项 (2 0 0 3CB4 15 0 0 4 )
国家自然科学基金 (40 0 2 4 10 1)
