Multi-Ratio Equilibrium Passive Sampling Method to Estimate Accessible and Pore Water Concentrations of Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls in Sediment
| Autoři | |
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| Rok publikování | 2013 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | ENVIRONMENTAL SCIENCE & TECHNOLOGY |
| Fakulta / Pracoviště MU | |
| Citace | |
| Doi | http://dx.doi.org/10.1021/es3040945 |
| Obor | Znečištění a kontrola vody |
| Klíčová slova | CARBON/WATER PARTITION-COEFFICIENTS; ORGANIC-COMPOUNDS; AQUEOUS SOLUBILITIES; CHEMICAL ACTIVITY; SURFACE WATERS; BLACK CARBON; EXTRACTION; SORPTION; BIOAVAILABILITY; CONTAMINANTS |
| Popis | The freely dissolved concentration (C-w,C-0) in the pore water and the accessible (releasable) concentration in the sediment (C-as,C-0) are important parameters for risk assessment. These parameters were determined by equilibrating contaminated sediments and passive samplers using largely differing sampler-sediment ratios. This method is based on the principle that incubations at low sampler/sediment ratios yield the concentration in the pore water (minor depletion of the sediment phase) and incubations at high sampler/sediment ratios yield the accessible concentration in the sediment (maximum depletion of the sediment phase). It is shown that equilibration was faster in dense suspensions and at high sampler/sediment ratios when compared to low sampler/sediment ratios. An equilibrium distribution model was used to estimate C-w,C-0 and C-as,C-0 by nonlinear least-squares regression. The method was evaluated three sediments (harbor, estuarine, marine). Accessible concentrations of 13 PAHs were 2 (low K-ow) to 10 (high K-ow) times lower than the total concentrations (three sediments). By contrast, the accessible concentrations of 15 PCBs were about 1.2 times lower than the total concentrations and displayed no trend with K-ow (one sediment). Implications for risk assessment and considerations for application of multi-ratio equilibrium passive sampling with other sediments are discussed. |
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