Assessing desorption resistance of PAHs in dissolved humic substances by membrane-based passive samplers

Chen, Shan; Xu, Yiping; Wang, Zijian

doi:10.1016/j.jcis.2010.06.022

Cited by 11 publications

(6 citation statements)

References 47 publications

(65 reference statements)

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“…We may assume that these dissolved PAHs released from sediment concomitantly to humic-like material were present in water both as free compounds and as complexes with DOM, which in turn might substantially modify their fate in the water column (Hur et al, 2014;Kim and Kwon, 2010;Sabbah et al, 2004). The coupling between PAHs and HS could be favored by the anoxic/diagenetic state of this deep sediment, since previous studies have shown that the binding capacity between PAHs and HS was negatively related to the oxidation degree and positively related to the OM humification degree (Chen et al 2010;He and Wang, 2011;Perminova et al, 1999).…”

Section: Dommentioning

confidence: 88%

Remobilization of polycyclic aromatic hydrocarbons and organic matter in seawater during sediment resuspension experiments from a polluted coastal environment: Insights from Toulon Bay (France)

Guigue

Tedetti

Dang

et al. 2017

Environmental Pollution

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Polycyclic aromatic hydrocarbons (PAHs) and organic matter contents were measured in seawater during resuspension experiments using sediments collected from Toulon Bay (Northwestern Mediterranean Sea, France). The studied sediments were very highly contaminated in PAHs, especially in 4-ring compounds emitted from combustion processes. The sediments used for resuspension experiments were collected at 0-2 cm (diagenetically new organic matter, OM) and 30-32 cm depths (diagenetically transformed OM). They were both mostly composed of fine particles (<63 μm), enriched in organic carbon (8.2 and 6.3%, respectively) and in PAHs (concentration of Σ34 PAHs: 38.2 and 35.7 × 10 ng g, respectively). The resuspension of these sediments led to an increase in concentrations of dissolved Σ34 PAHs, dissolved organic carbon (DOC) and dissolved humic- and tryptophan-like fluorophores in seawater up to 10-, 1.3-, 4.4- and 5.7-fold, respectively. The remobilization in seawater was higher for 4-6 ring PAHs, especially benzo(g,h,i)perylene, whose concentration exceeded the threshold values of the European Water Framework Directive. This noted the potential harmful effects of sediment resuspension on marine biota. From these sediment resuspension experiments, we determined OC-normalized partition coefficients of PAHs between sediment and water (K) and found that during such events, the transfer of PAHs from sediment particles to seawater was lower than that predicted from octanol-water partition coefficients (K) (i.e., measured K > K predicted from K). The results confirmed the sequestration role of sedimentary OC quality and grain size on PAHs; the OM diagenetic state seemed to impact the partition process but in a relatively minor way. Furthermore, differences were observed between 2-4 ring and 5-6 ring PAHs, with the latter displaying a relatively higher mobility towards seawater. These differences may be explained by the distribution of these two PAH pools within different OM moieties, such as humic substances and black carbon.

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Section: Dommentioning

confidence: 88%

Remobilization of polycyclic aromatic hydrocarbons and organic matter in seawater during sediment resuspension experiments from a polluted coastal environment: Insights from Toulon Bay (France)

Guigue

Tedetti

Dang

et al. 2017

Environmental Pollution

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“…In a particle of soil, a HOC molecule could be small enough that it fits into minute pore spaces, following diffusion through the dissolved water phase. Such a tortuous journey occurs with increased ageing such that contaminant remobilisation is unlikely 84 82,84,105,106 . HOC pools in soil can be segregated into fractions ranging from that which is weakly sorbed to the strongly sorbed 22,27 .…”

Section: Mechanisms Controlling Sequestration Of Hocs In Soils: Implimentioning

confidence: 99%

Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?

Umeh

Duan

Naidu

et al. 2017

Environment International

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Risk-based approaches to managing contaminated land, rather than approaches based on complete contaminant removal, have gained acceptance as they are likely to be more feasible and cost effective. Risk-based approaches aim to minimise risks of exposure of a specified contaminant to humans. However, adopting a risk-based approach over alternative overly-conservative approaches requires that associated uncertainties in decision making are understood and minimised. Irrespective of the nature of contaminants, a critical uncertainty is whether there are potential risks associated with exposure to the residual contaminant fractions in soil to humans and other ecological receptors, and how they should be considered in the risk assessment process. This review focusing on hydrophobic organic contaminants (HOCs), especially polycyclic aromatic hydrocarbons (PAHs), suggests that there is significant uncertainty on the residual fractions of contaminants from risk perspectives. This is because very few studies have focused on understanding the desorption behaviour of HOCs, with few or no studies considering the influence of exposure-specific factors. In particular, it is not clear whether the exposure of soil-associated HOCs to gastrointestinal fluids and enzyme processes release bound residues. Although, in vitro models have been used to predict PAH bioaccessibility, and chemical extractions have been used to determine residual fractions in various soils, there are still doubts about what is actually being measured. Therefore it is not certain which bioaccessibility method currently represents the best choice, or provides the best estimate, of in vivo PAH bioavailability. It is suggested that the fate and behaviour of HOCs in a wide range of soils, and that consider exposure-specific scenarios, be investigated. Exposure-specific scenarios are important for validation purposes, which may be useful for the development of standardised methods and procedures for HOC bioaccessibility determinations. Research is needed to propose the most appropriate testing methods and for assessing potential risks posed by residual fractions of HOCs. Such investigations may be useful for minimising uncertainties associated with a risk-based approach, so that consideration may then be given to its adoption on a global scale. This review critically appraises existing information on the bioavailability of HOC residues in soil to establish whether there may be risks from highly sequestered contaminant residues.

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“…Our previous work has shown that the uptake rate of HOCs in triolein-embedded cellulose acetate membrane (TECAM) is independent on HA concentrations [19]. Thereby it can be convinced that the presence of NOM does not affect the uptake kinetics by TECAM, so it was used to quantitate the free concentration of analyte in NOM-containing samples and acting as a sink to sequestrate freely dissolved solute [20].…”

Section: Introductionmentioning

confidence: 99%

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

Wang

Chen

et al. 2012

Journal of Colloid and Interface Science

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a b s t r a c tThe aging effects of sorption-desorption of two polycyclic aromatic hydrocarbons (PAHs), that is, phenanthrene and chrysene on different natural organic matters (NOMs), that is, humic acid, fulvic acid, and humins of different sources were studied. Both organic carbon-normalized distribution coefficients (K oc ) and the reversible desorption fractions (f rd ) were evaluated. Results showed that aging effects were both sorbent and sorbate specific. With increasing aging duration, K oc s of phenanthrene on humins increased, whereas K oc s of chrysene did not change significantly. Significant f rd declinations over aging times were observed for all the NOMs, which demonstrated the effects of aging on availability of PAHs. Furthermore, the f rd was not only positively correlated with the atomic O/C ratio of NOMs, which represent the geological maturity of NOMs, but also varied with the property of sorbates. We conclude that aging effects of HOCs on NOMs should be a case-specific process and the desorption reversibility depends on the structure and characteristics of both NOMs and sorbates.

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Assessing desorption resistance of PAHs in dissolved humic substances by membrane-based passive samplers

Cited by 11 publications

References 47 publications

Remobilization of polycyclic aromatic hydrocarbons and organic matter in seawater during sediment resuspension experiments from a polluted coastal environment: Insights from Toulon Bay (France)

Remobilization of polycyclic aromatic hydrocarbons and organic matter in seawater during sediment resuspension experiments from a polluted coastal environment: Insights from Toulon Bay (France)

Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

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