摘要
采集我国北方某大型钢铁企业22个表层土壤(0~20 cm)样品,采用气相色谱-质谱联用仪(GC-MS)分析了土壤中16种优控多环芳烃(PAHs)的含量.结果表明,土壤中Σ16PAHs含量范围为22.0~20 062.0μg·kg^(-1),且以中高环(4、5环)为主,单体以Flu、Pyr的含量最高.与同类相关研究比较,该钢铁厂表层土壤中PAHs污染处于中等水平,中、重度污染采样点主要位于焦化厂、球团厂等典型区域.20个采样点PAHs单体均超过荷兰土壤质量标准中10种PAHs的目标值,而与北京工业场地土壤筛选值相比,仅部分采样点BaA、BaP超标.源解析结果表明,表层土壤中PAHs主要来源于以煤为主的化石燃料的燃烧,石油类燃烧和泄漏的贡献较少.健康风险评价结果表明,BaP、BaA、DBA、BbF、InP在居住用地条件下的致癌风险超过了1×10^(-6),BaP、BaA、DBA在工业用地条件下的致癌风险超过了1×10-6,BaP的致癌风险最大,该钢铁厂表层土壤中PAHs已对人群健康产生危害,需实施土壤修复工程.
16 priority control polycyclic aromatic hydrocarbons（ PAHs） were analyzed by GC-MS in 22 surface soil（ 0-20 cm）samples collected from a large steel enterprise in the north of China. The concentrations of Σ 16 PAHs ranged from 22. 0 μg·kg-1to20 062. 0 μg·kg-1. 4 to 5 aromatic rings were the dominant,typically fluorene（ Flu） and pyrene（ Pyr）. Compared with related domestic research,PAH pollution in the steel enterprise reached medium level,with fifty percent of the soil points were at moderate and severe pollution levels,mainly in the coking and pellet plant area. The concentrations of 10 PAHs in 20 soil samples exceeded the Dutch target reference values. Compared with soil screening value of Beijing contaminated industrial sites,only part of the sample points exceeded the standard,typically benzo[a]anthracene（ Ba A） and benzo[a]pyrene（ Ba P）. The source apportionment showed that soil PAHs mainly originated from combustion products of coal and other fossil fuels with only a small portion contributed by oil combustion and spill. The health risk assessment showed that the carcinogenic risks of benzo[a]pyrene（ Ba P）,benzo[a]anthracene（ Ba A）,dibenz（ a,h） anthracene（ DBA）,benzo[b]fluoranthene（ Bb F）,indeno[1,2,3-cd]pyrene（ In P） exceeded the threshold of 1× 10^-6under residential land condition,the carcinogenic risks of benzo[a]pyrene（ Ba P）,benzo[a]anthracene（ Ba A）,dibenz（ a,h）anthracene（ DBA） also exceeded the threshold of 1 × 10^-6 under industrial land condition. The carcinogenic risk value of benzo[a]pyrene（ Ba P） was the biggest among the 16 PAHs. The soil PAHs in the steel enterprise already caused harm to human health and the soil restoration project must be carried out.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2016年第9期3540-3546,共7页
Environmental Science
基金
山东省科技攻关项目(2008GG10006006)
关键词
多环芳烃
大型钢铁企业
表层土壤
污染特征
来源
健康风险评价
PAHs
a large steel enterprise
surface soils
pollution characteristic
source
health risk assessment
