杭州地区城区降雪中全氟化合物的污染特征

发布时间：2018-02-22 21:16

本文关键词： 全氟化合物降雪杭州污染特征超高效液相色谱-串联质谱　出处：《环境科学》2017年08期 　论文类型：期刊论文

【摘要】：通过调查杭州降雪中16种全氟化合物(PFCs)的质量浓度,考察了杭州地区大气中PFCs的污染状况.2016年1月20~22日,在杭州市城区及主要郊县建成区共计11个采样点采集降雪样品,应用固相萃取净化、富集与超高效液相色谱-串联质谱联用相结合的方法,测定样品中PFCs质量浓度.所有采样点降雪均有不同浓度的PFCs检出,全部样品共检出包括C_4和C_8全氟烷基磺酸以及C_4~C_6、C_8和C_9全氟烷基羧酸等7种中短链PFCs.ΣPFCs质量浓度范围为2.85~35.1 ng·L~(-1),其中全氟辛酸(PFOA)质量浓度范围2.15~23.0 ng·L~(-1),为主要污染因子,全氟辛烷磺酸(PFOS)检出浓度较低,为0~0.46 ng·L~(-1).与国内外其它地区相比杭州降雪中PFOA含量居于中等水平,PFOS含量则处于相对较低水平.污染物空间分布城区略高于郊县,其中富阳最高,建德和淳安较低.本次调查,在研究区域降雪中普遍检出以PFOA为主较高浓度的PFCs,表明湿沉降已经成为杭州地区土壤、地表水和地下水等生态系统PFCs污染一个不可忽视的污染源,需要有关部门引起足够的重视.研究结果揭示了杭州地区大气中广泛存在以PFOA为主的PFCs污染,大气因素可能已成为当地人群和生态环境暴露PFCs的重要途径之一.
[Abstract]:The air PFCs pollution in Hangzhou area was investigated by investigating the mass concentration of 16 perfluorocarbons (PFCs) in snow in Hangzhou. From January 2016 to 22nd, snow samples were collected from 11 sampling sites in the urban area of Hangzhou and the main suburban counties. Solid phase extraction (SPE) purification, enrichment and ultrahigh performance liquid chromatography-tandem mass spectrometry were used to determine the mass concentration of PFCs in the samples. All the snow samples were detected with different concentrations of PFCs. A total of seven short-chain PFCs. 危 PFCs, including Csta4 and C8 perfluoroalkyl sulfonic acid and C4CX C6C8 and C9 perfluoroalkyl carboxylic acid, were detected in the mass concentration range of 2.85 ~ 35.1 ng 路L ~ (-1) ~ (-1), in which PFOAA (2.15g 路L ~ (-1) ng 路L ~ (-1)) was the main pollution factor. The detected concentration of perfluorooctane sulfonic acid (PFOS) was 0.46 ng 路L ~ (-1) 路L ~ (-1). Compared with other regions at home and abroad, the content of PFOA in snow in Hangzhou was relatively low. The spatial distribution of pollutants in urban area was slightly higher than that in suburban county, and Fuyang was the highest. Jiande and Chun'an are relatively low. In this investigation, a relatively high concentration of PFOA was generally detected in snowfall in the study area, indicating that wet deposition has become an unnegligible pollution source of PFCs pollution in soil, surface water, groundwater and other ecosystems in Hangzhou. The results show that PFCs pollution, which is dominated by PFOA, is widespread in the atmosphere of Hangzhou, and atmospheric factors may be one of the important ways to expose PFCs to local people and ecological environment.
【作者单位】：杭州市环境监测中心站;萧山区环境监测站;
【基金】：杭州市社会发展科研攻关项目(20130533B02,20160533B84)
【分类号】：X51

【参考文献】