التفاصيل البيبلوغرافية
| العنوان: |
Predicting Pore Water EPA-34 PAH Concentrations and Toxicity in Pyrogenic-Impacted Sediments Using Pyrene Content. |
| المؤلفون: |
Arp, Hans Peter H.1 hpa@ngi.no, Azzolina, Nicholas A.2 nick.azzolina@gmail.com, Cornelissen, Gerard1,3,4, Hawthorne, Steven B.5 |
| المصدر: |
Environmental Science & Technology. 6/15/2011, Vol. 45 Issue 12, p5139-5146. 8p. |
| مصطلحات موضوعية: |
*STATISTICAL correlation, CONTAMINATED sediments, POLYCYCLIC aromatic hydrocarbons, PYRENE, PORE water, RAOULT'S law, WATER quality biological assessment |
| مستخلص: |
Sediment and freely dissolved pore water concentrations of the U.S. Environmental Protection Agency's list of 34 alkyl and parent PAHs (EPA-34) were measured in 335 sediment samples from 19 different sites impacted by manufactured gas plants, aluminum smelters and other pyrogenic sources. The total EPA-34 freely dissolved pore water concentration, Cpw,EPA-34, expressed as toxic units (TU) is currently considered one of the most accurate measures to assess risk at such sites; however, it is very seldom measured. With this data set, we address how accurately Cpw,EPA-34 can be estimated using limited 16 parent PAH data (EPA-16) commonly available for such sites. An exhaustive statistical analysis of the obtained data validated earlier observations that PAHs with more than 3 rings are present in similar relative abundances and their partitioning behavior typically follows Raoult's law and models developed for coal tar. As a result, sediment and freely dissolved pore water concentrations of pyrene and other 3- and 4-ring PAHs exhibit good log-log correlations (r² > 0.8) to most individual EPA-34 PAHs and also to Cpw,EPA-34. Correlations improve further by including the ratio of high to low molecular weight PAHs, as 2-ring PAHs exhibit the most variability in terms of their relative abundance. The most practical result of the current work is that log Cpw,EPA-34 estimated by the recommended pyrene-based estimation techniques was similarly well correlated to % survival of the benthic amphipods Hyalella azteca and Leptocheirus plumulosus as directly measured log Cpw,EPA-34 values (n = 211). Incorporation of the presented Cpw,EPA-34 estimation techniques could substantially improve risk assessments and guidelines for sediments impacted by pyrogenic residues, especially when limited data are available, without requiring any extra data or measurement costs. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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