Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China.
Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China.
Sci Total Environ. 2019 Feb 15;651(Pt 1):427-434. doi: 10.1016/j.scitotenv.2018.09.097. Epub 2018 Sep 8.
In this work, Tenax consecutive extractions of polycyclic aromatic hydrocarbons (PAHs) were conducted in two spiked sediments to investigate the influence of different Tenax addition amounts and desorption times on the rapidly desorbing fraction of PAHs, and to determine a reliable method for estimating PAHs bioavailability. The results indicated that a large Tenax addition amount has a positive effect on the desorption of PAHs from sediments. The desorption amounts of target PAHs compounds (3-ring phenanthrene and 4-ring fluoranthene) increased as the Tenax: sediment ratios increased from 0.25 to 2 in two spiked sediments. The highest desorption percentages of phenanthrene and fluoranthene were 48.91% and 34.70% for Jialing industrial park sediment, and 43.36% and 33.24% for Huanghuayuan bridge sediment, respectively. The results of desorption kinetics were suitably fitted with first order three-compartment model to estimate the rapidly desorbing fraction, Moreover, the Tenax: sediment ratio of 1 and desorption time of 24 h were found to be suitable for the desorption of phenanthrene and fluoranthene from sediments. The PAHs in sediments were biodegraded well by the bacterial strain J1-q. Comparing the maximum biodegraded amount of target PAHs in 30 days and the desorbed fraction over 400 h, the results showed that Tenax had better correlation with the high molecular weight fluoranthene than with the low molecular weight phenanthrene.
在这项工作中，使用 Tenax 连续萃取两种加标沉积物中的多环芳烃（PAHs），以研究不同 Tenax 添加量和洗脱时间对 PAHs 快速解吸部分的影响，并确定一种可靠的方法来估计 PAHs 的生物可利用性。结果表明，大量 Tenax 的添加量对从沉积物中解吸 PAHs 有积极的影响。在两种加标沉积物中，随着 Tenax:沉积物比例从 0.25 增加到 2，目标 PAHs 化合物（三环菲和四环荧蒽）的解吸量增加。嘉陵工业园区沉积物中菲和荧蒽的最大解吸百分比分别为 48.91%和 34.70%，黄花园大桥沉积物中分别为 43.36%和 33.24%。解吸动力学的结果适合用一级三箱模型拟合来估计快速解吸部分，此外，发现 Tenax:沉积物比例为 1 和洗脱时间为 24 h 适用于从沉积物中解吸菲和荧蒽。细菌菌株 J1-q 很好地降解了沉积物中的 PAHs。比较 30 天内目标 PAHs 的最大生物降解量和 400 h 以上的解吸部分，结果表明 Tenax 与高分子量荧蒽的相关性优于与低分子量菲的相关性。
