摘要
低氧环境普遍存在于底层水体以及表层沉积物中,随着中国水体有机污染加剧,低氧现象将越来越明显。有研究表明,中国水体普遍受到多环芳烃污染,由于其强烈的憎水性和低溶解性,大部分多环芳烃沉积在底泥中。总结了学者们对国内外河流、湿地、河口等水体沉积物中多环芳烃污染的研究成果,探讨了多环芳烃的分布规律,发现沉积物中多环芳烃含量与流域内经济发展状况密切相关,反映了经济发展过程对环境造成的负面影响。相比于国外典型区域的多环芳烃浓度,中国沉积物的多环芳烃污染处于中等水平,但处于快速上升阶段,部分点位浓度已超过生态风险区间低值(4 000ng/g),对人们的身体健康构成威胁,所以对多环芳烃的生态风险评价、污染物排放控制需进一步加强。
Hypoxic environment is prevalent in the bottom water and surface sediments. With organic pollution exacerbating, hypoxia phenomenon in water environments of China will be more significant. The previous studies had showed that most of the water environments of China were contaminated by polycyclic aromatic hydrocarbons （PAHs）. Due to their strong hydrophobicity and low solubility, most of PAHs are deposited in sediments. This pa- per has collected the findings of PAHs contamination in domestic and foreign rivers, wetlands, estuaries and other water sediments, and the distribution regular pattern is also investigated. PAHs concentration in sediments is closely related to the economic development level in the basin, reflecting the negative impact of the process of economic devel- opment on the environment. Compared with overseas typical areas, the PAHs concentration of water body sediments in our country is in the middle levels, but on the rapidly upswing. Some sites have exceeded the ecological risk inter- val low value （4 000 ng/g） and threat to people＇s health. Therefore, evaluation of the ecological risks of PAHs, and the relative pollutant controlling measures should be further strengthened.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第2期104-110,共7页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.41101487)
关键词
多环芳烃
低氧环境
沉积物
来源
分布状况
polycyclic aromatic hydrocarbons
hypoxic environment
sediments source
distribution
