Cemagref, Centre de Martinique, UR PRAM - Quartier Petit Morne - BP 214, Lamentin 97 285, France.
Environ Toxicol. 2010 Oct;25(5):527-32. doi: 10.1002/tox.20598.
The use of passive samplers for the assessment of organic contaminants has been extended to solid matrixes for the past decade. Passive sampling is usually applied to sediment in laboratory experiments involving significant upheaval, whereas in-situ experiments remain rare. In this study, low-density polyethylene (LDPE) strips were deployed within the sediments of a small river contaminated with polycyclic aromatic hydrocarbons (PAHs). LDPE strips were deployed in the 3-cm depth sediment layer. Over a period of 36 days, LDPE strips were regularly retrieved and accumulated PAHs in LDPE were extracted and analyzed. Accumulations of hydrophobic contaminants in LDPE directly exposed in the sediment were observed. Accumulations in LDPE were observed for moderately hydrophobic PAHs with the highest concentrations in the sediment. Low accumulations were observed for more hydrophobic compounds, despite their presence in high concentrations in the sediment. This was explained by very low exchange rates and competitive interactions with particles in the sediment.
在过去十年中，被动采样器已被用于评估有机污染物在固体基质中的含量。在涉及重大搅动的实验室实验中，通常将被动采样应用于沉积物，而原位实验仍然很少。在这项研究中，低密度聚乙烯（LDPE）条带被部署在被多环芳烃（PAHs）污染的小河的沉积物中。LDPE 条带被部署在 3 厘米深的沉积物层中。在 36 天的时间里，定期取回 LDPE 条带，提取并分析 LDPE 中积累的 PAHs。直接暴露在沉积物中的 LDPE 中观察到疏水性污染物的积累。在 LDPE 中观察到中等疏水性 PAHs 的积累，其在沉积物中的浓度最高。尽管某些化合物在沉积物中浓度很高，但观察到的疏水性更强的化合物的积累量较低。这可以用极低的交换率和与沉积物中颗粒的竞争相互作用来解释。
