NDLI: Investigating particle concentration effects of polycyclic aromatic hydrocarbon (PAH) sorption on sediment considering the freely dissolved concentrations of PAHs

Content Provider	Springer Nature Link
Author	Dong, Jianwei Xia, Xinghui Zhai, Yawei
Copyright Year	2013
Abstract	Suspended particulate sediment (SPS) concentration has a great impact on the sediment to water partitioning coefficients (K $_{p}$) of hydrophobic organic compounds (HOCs), which is called the particle concentration effect (PCE). However, the mechanisms regarding the PCE are not yet well understood, and there is little direct experimental evidence for these mechanisms. The aim of this study was to investigate the PCE of polycyclic aromatic hydrocarbon (PAH) sorption on sediment by analyzing the freely dissolved concentrations of PAHs.Sediments were collected from the Yellow River and the Haihe River in China. Pyrene was selected as a model PAH to investigate the sorption of PAH on sediments. In addition to the total dissolved concentration (C $_{TW}$) of pyrene, the freely dissolved concentration (C $_{FW}$) measured by polyethylene devices was used to investigate the PCE of pyrene in the presence and absence of phenanthrene and chrysene.For both the Haihe River and Yellow River sediments, in the presence and absence of other PAHs, the K $_{p}$ value of pyrene with C $_{FW}$ as the equilibrium concentration in the water phase was approximately two times higher than that with C $_{TW}$ as the equilibrium concentration. With either C $_{TW}$ or C $_{FW}$ as the equilibrium concentration in the water phase, the K $_{p}$ value of pyrene decreased with increasing SPS concentration as a power function. In addition, the K $_{p}$ value with C $_{TW}$ as the equilibrium concentration decreased faster than that with C $_{FW}$. This inferred that, apart from a third phase including dissolved organic carbon (DOC) and colloids, particle–particle, or particle–DOC interactions were important for the PCE. The contribution of the third phase to the PCE for the Haihe River sediment (72.5 ± 26.4 %) was greater than the contribution for the Yellow River sediment (48.4 ± 16.2 %), which had a larger particle size and lower total organic carbon and black carbon contents.The PCE of PAH sorption onto sediments was attributed to both the third phase and to particle–particle or particle–DOC interactions. The contribution of the third phase to the PCE depended on both the TOC content and the particle size of sediment. As high SPS and DOC concentrations exist in many rivers, their effects on the sorption of HOCs should be considered when conducting bioavailability and ecological risk assessment.
Starting Page	1469
Ending Page	1477
Page Count	9
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	13
Issue Number	8
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-06-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Freely dissolved concentration Hydrophobic organic compounds (HOCs) Particle concentration effect Polyethylene device Sorption Suspended sediment Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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