本文使用3种单相聚合物制作用于多环芳烃被动采样的装置,这3种聚合物分别为聚甲醛(POM)、硅橡胶(SR)和聚乙烯(PE),通过室内试验测定了它们的分配系数和POM的扩散系数以及验证了动态积累模型。此外,在野外现场对每种装置的性能进行了评估。基于已开发模型的支持,讨论了使用不同材料和聚合物厚度的装置性能。结果表明,采样器性能,比如浓度平均周期的长短和多环芳烃的采集容量,都广受所选材料的影响。采样器的厚度也会对装置的性能造成影响,但程度很小。选择合适的聚合物和/或厚度可以使采样器更有适用于快速平衡或动态积累,以及促进膜或水边界层对动态积累的控制。此外,利用膜技术控制或平衡的化合物能够更精确的被量化,因为它们不需要利用参比法(PRC)来校正。然而,当富集浓度达到平衡后,采样器中的平均浓度就不能准备测量化合物浓度,而由膜控制的采样装置通过动态累积的方式能够提供不需要PRC校正的平均浓度;随着膜传质阻力的提高,采样器的检测限也得到提高。
精选自Angel Belles, Claire Alary, Yannick Mamindy-Pajany.Thickness and material selection of polymeric passive samplers for polycyclic aromatic hydrocarbons in water: which more strongly affects sampler properties?. Environmental Toxicology and Chemistry: Volume 35, Issue 7, pages 1708–1717, July 2016.
DOI: 10.1002/etc.3326
详情请见http://onlinelibrary.wiley.com/doi/10.1002/etc.3326/full 相似文献
In recent years, many industrial enterprises located in the urban centers of China have been relocated owing to the rapid increase in urban development. At the sites abandoned by these enterprises, volatile organic compounds have frequently been detected, sometimes at high concentrations, particularly at sites abandoned by chemical manufacturing enterprises. With the redevelopment of sites and changes in land-use type associated with these sites, substantial amounts of contaminated soils now require remediation. Since China is a developing country, soil remediation warrants the usage of techniques that are suitable for addressing the unique challenges faced in this country. Land shortage is a common problem in China; the large numbers of contaminated sites, tight development schedules, and limited financial resources necessitate the development of cost-effective methods for land reclamation. Mechanical soil aeration is a simple, effective, and low-cost soil remediation technique that is particularly suitable for the remediation of large volatile organic compound-contaminated sites. Its effectiveness has been confirmed by conducting laboratory studies, pilot tests, and full-scale projects. This study reviews current engineering practice and developmental trends of mechanical soil aeration and analyzes the advantages and disadvantages of this technology for application in China as an emerging soil remediation market. The findings of this study might aid technology development in China, as well as assist other developing countries in the assessment and implementation of costeffective hazardous waste site soil remediation programs.
