龙凤湿地表层沉积物中芳香烃类污染物分布特征

龙凤湿地由于长期承泄工业废水和城市生活污水而受到不同程度的污染．湿地中的水体流动性差，众多芳香烃类污染物在表层沉积物中富集、沉积，部分有机污染物难以降解．通过实验分析检测这些芳香烃类污染物在湿地不同区域沉积物中的质量分数从0．15～4mg／g变化较大，其中苯系物主要为C4苯和C7苯，多环芳香烃以萘、蒽、菲系列化合物中的萘、C2萘、C3萘及蒽、菲、甲基蒽、甲基菲为主，而且具有PAHs质量分数高于苯系物以及C2萘与甲基菲质量分数高的特征．龙凤湿地表层沉积物中的C2萘及甲基菲等质量分数高，有机污染物成为潜在的二次污染源．

Distribution Characteristics of Pollutants for Aromatic Hydrocarbons in Bottom Mud at Longfeng Wetland

The Longfeng wetland was contaminated in different extent by lots of industrial and domes- tic waste water. Owing to the low liquidity of wetland water,lots of aromatics contaminants were enriched and aggraded,and the degradation of some organic pollutants is difficult in the anaerobic environment. By means of experimental analysis,the contents of these aromatics pollutants vary widely from 0. 15 to 4.00 mg/g in different areas of the wetland sediments, among which BTEX are mainly C4 and C7 benzene,poly- cyclic aromatic hydrocarbons are mainly naphthalene, anthracene, Philippine series of compounds, naphtha- lene, C2 naphthalene, C3 naphthalene and anthracene, phenanthrene, methylanthracene, methylphenan- threne-based,moreover,the contents of PAHs are higher than BTEX and C2 naphthalene and the content of methylphenanthrenes is high. In Longfeng wetland surface sediments,the high contents of organic pollu- tants such as C2 naphthalene and methylphenanthrene constitute potential secondary pollution source.