Bound PAHs in Sediment and Related Environmental Significance
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Extractable polycyclic aromatic hydrocarbons (EPAHs) and bound PAHs (BPAHs) were measured in a sediment core using conventional Soxhlet extraction and a more astringent extraction method, with the objectives of determining the influence of BPAHs on the historical reconstruction of PAHs and exploring the formation of BPAHs and long-term behaviors of PAHs in sediment. The results indicated that the formation of BPAHs was clearly sediment-depth and molecular-size dependent. BPAHs represents an important portion of PAHs in sediment and cannot be extracted by conventional Soxhlet extraction. This suggests that the previously developed vertical profile of PAHs is not the real chronology of PAHs and the plausible interpretation derived from the sedimentary records of PAHs needs reexamination. Based on the previous findings, a biphase model was proposed and the formation of BPAHs was predicted. Due to the different nature of geosorbents in sediment, redistribution of PAHs among these geosorbents logically leads to the formation of BPAHs and is kinetically favorable for smaller molecular PAHs. This is consistent with the obtained results. Many factors may influence the formation of BPAHs, such as the physicochemical structure of sediment and environmental conditions. There is still a long way to reveal the thermodynamical characteristics in action during the formation of BPAHs.
KeywordsPAHs Sediment Depth Deep Sediment Dianchi Lake Ring PAHs
This work was financially supported by the National Key Research and Development Project by MOST of China (No. 2016YFA0601003), the National Science and Technology Major Project of the Ministry of Science and Technology of China (2011ZX07212-007), the Chinese NSF projects (Nos. 41403113 and U1302231), and Science and Technology Project of Guizhou Province (2001). The authors appreciate greatly the anonymous reviewers and the Associate Editor for their precise comments on the manuscript, which were very helpful to improve the quality of this paper.
- Li QH, Guo JY, Zhu YR, Zhang RQ, Li XL (2013) High-resolution sedimentary records of polycyclic aromatic hydrocarbons in hongfeng lake of southwest china. Chin J Ecol 32:2424–2432 (in Chinese) Google Scholar
- Oukebdane K, Portet-Koltalo F, Machour N, Dionnet F, Desbéne PL (2010) Comparison of hot Soxhlet and accelerated solvent extractions with microwave and supercritical fluid extractions for the determination of polycyclic aromatic hydrocarbons and nitrated derivatives strongly adsorbed on soot collected inside a diesel particulate filter. Talanta 82:227–236CrossRefGoogle Scholar
- Ten Hulscher TEM, Vrind BA, Van den Heuvel H, Van der Velde LE, Van Noort PCM, Beurskens JEM, Govers HAJ (1999) Triphasic desorption of highly resistant chlorobenzenes, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons in field contaminated sediment. Environ Sci Technol 33:126–132CrossRefGoogle Scholar
- Tuikka AI, Leppänen MT, Akkanen J, Sormunen AJ, Leonards PEG, van Hattum B, van Vliet LA, Brack W, Smedes F, Kukkonen JVK (2016) Predicting the bioaccumulation of polyaromatic hydrocarbons and polychlorinated biphenyls in benthic animals in sediments. Sci Total Environ 563–564:396–404CrossRefGoogle Scholar