摘要
为进一步探讨大气颗粒物中DDTs的环境危害和给风险评价提供数据支持,采用气溶胶粒度分布采样器(辽阳应用技术研究所,FA-3)采集并分析了天津13个样点冬季不同粒径大气颗粒物中DDTs残留量。结果表明,p,p'-DDT(1.071±0.736ng·m-3),p,p'-DDE(0.858±0.532ng·m-3)是主要污染物,p,p'-DDD(0.436±0.190ng·m-3)浓度相对较低。不同粒径颗粒物对DDTs的富集程度有差异,在4.7-5.8μm和<0.43μm范围内有较强的富集趋势。粒径<2.1μm的颗粒中p,p'-DDE/ΣDDT比值明显小于粒径>2.1μm的颗粒的该比值。不同样点大气颗粒物中DDTs浓度差异显著,可能与早期农业施用空间差异有关。
Along with some other chlorinated micro-pollutants, organochlorine pesticides （OCPs） such as DDTs have become widely distributed throughout the world. DDTs can be transported by airborne particles to destinations distant from regions where they have been applied and can pose a real threat to human and animal health. For measuring DDTs in airborne particles and providing risk assessment with data support, airborne particles for PM10 （particulate matter with aerodynamic diameters less than 10μm） were collected using a FA-3 aerosol cascade sampler from 13 sites of Tianjin during winter in 2002. The particulate matters were separated into 9 size ranges according to aerodynamic diameter of particles. PM10 displayed a bimodal mass-size distribution pattern, with the first peak of 1.1-2.1μm and the second peak of 〉9μm. DDTs residues in various size fractions of the samples were measured, p,p＇-DDT（1.071±0.736 ng·m^-3） and p,p＇-DDE （0.858±0.532 ng·m^-3） were dominant, while the concentration of p,p＇-DDD（0.436±0.190 ng·m^-3） was relatively low. The accumulation of DDTs in the particles was greater in the particles of 4.7-5.8μm and 〈0.43μm with respect to other size fractions. The ratios of p,p＇-DDE to ∑DDT in particles of 〈2.1 μm were significant less than those in particles of 〉2.11μm. The average ratio of 13 sites was 0.366, which suggested recent input of DDTs in Tianjin. There was a distinct diversity in the concentration of DDTs in various samples.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2005年第6期1182-1185,共4页
Journal of Agro-Environment Science
基金
国家自然科学基金(40332015
40021101)
国家重点基础研究发展计划(2003CB415004)
教育部重点项目
