Effect of salting out on the desorption-resistance of polycyclic aromatic hydrocarbons (PAHs) in coastal sediment

Oh, Sanghwa; Wang, Qiliang; Shin, Won Sik; Song, Dong‐Ik

doi:10.1016/j.cej.2013.03.069

Cited by 42 publications

(20 citation statements)

References 25 publications

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“…Moreover, from 0.01 to 0.1 M of urea concentration, K d values (8.47 and 8.34 L/kg, respectively) of ibuprofen sorption increased a little bit compared to K d without urea addition but at 1.0 M urea, K d value (7.06 L/kg) was almost the same as the value (6.76 kg/L) without urea addition. This result suggests that ibuprofen sorption can be affected by “salting out effect” (Gu et al 2007; Oh et al 2013) if urea was not reacted with ibuprofen.…”

Section: Resultsmentioning

confidence: 95%

“…Figure 4 illustrates that the sorption behavior of ibuprofen on sediment followed linear isotherm at all different salinities. K d for ibuprofen sorption increased with salinity due to “salting out” effect, which is caused by high salinity resulting in high compressive water-water interaction, decreasing water solubility, and less cavitation of water molecule (Turner 2003; Oh et al 2013). Oh et al (2013) also reported that log K ow of hydrophobic PAHs increased with salinity, indicating that hydrophobic materials may be sorbed easily onto sediment at high salinity.…”

Section: Resultsmentioning

confidence: 99%

“…Temporal and spatial gradients of salinity and DOMs in estuaries or coastal waters are known to affect the solubility of the hydrophobic compounds in water. Many researches also have reported that salinity also can affect sorption of hydrophobic organic compounds on the sediment in estuary or seawater (Oh et al 2013; Tremblay et al 2005; Wu and Sun 2010). However, studies on the behavior of PPCPs such as ibuprofen in the complex system with DOM, PPCP, water, and sediment system have almost not been up to now (Pan et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Oh¹,

Shin

Kim

2016

Environ Sci Pollut Res

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Ibuprofen is well known as one of the most frequently detected pharmaceuticals and personal care products (PPCPs) in rivers. However, sorption of ibuprofen onto sediment has not been considered in spite of its high K ow (3.5). In this study, the effects of various environmental conditions such as pH (4, 5.3, and 7), the concentrations of dissolved organic matters (0 to 1.0 mM citrate and urea), salinity (0, 10, 20, and 30 part per thousand), and presence of other PPCP (salicylic acid) on ibuprofen sorption were investigated. Linear model mainly fitted the experimental data for analysis. The distribution coefficient (K d) in the linear model decreased from 6.76 at pH 4 to near zero at pH 7, indicating that neutral form of ibuprofen at pH below pKa (5.2) was easily sorbed onto the sediment whereas the sorption of anionic form at pH over pKa was not favorable. To investigate the effect of dissolved organic matters (DOMs) on ibuprofen sorption, citrate and urea were used as DOMs. As citrate concentration increased, the K d value decreased but urea did not interrupt the ibuprofen sorption. Citrate has three carboxyl functional groups which can attach easily ibuprofen and hinder its sorption onto sediment. Salinity also affected ibuprofen sorption due to decrease of the solubility of ibuprofen as salinity increased. In competitive sorption experiment, the addition of salicylic acid also led to enhance ibuprofen sorption. Conclusively, ibuprofen can be more easily sorbed onto the acidified sediments of river downstream, especially estuaries or near-shore environment with low DOM concentration.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Oh¹,

Shin

Kim

2016

Environ Sci Pollut Res

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“…The result indicated that PAHs and OPAHs firstly underwent an adsorption process. The log K ow value of PAHs increased with the increasing PAH molecular weight [23]. Compounds with a higher log K ow value were adsorbed more easily on the solid phase.…”

Section: Removal Of Pahs and Opahsmentioning

confidence: 87%

Formation of oxygenated polycyclic aromatic hydrocarbons from polycyclic aromatic hydrocarbons during aerobic activated sludge treatment and their removal process

Qiao

Liu

et al. 2016

Chemical Engineering Journal

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“…The latter values were therefore slightly higher (by 1 and 2.1 day, respectively, for LMW and HMW PAHs) due to the higher salinity of open-sea water, which reduces non-polar PAH water solubility (Tremblay et al 2005;Shukla et al 2007). Oh et al (2013) found that PAH water solubility decreased as salinity increased from 0 to 30 ppt in coastal sediments, resulting in enhanced PAH sorption. Our findings confirm their data, especially with regard to open-sea sediments, where salinity was higher (30 ppt).…”

Section: Degradation Parameter (T 1/2 )mentioning

confidence: 97%

Polycyclic Aromatic Hydrocarbon Degradation and Sorption Parameters in Coastal and Open-Sea Sediment

Frapiccini

Marini

2015

Water Air Soil Pollut

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This work describes the experimental determination of the major degradation and sorption parameters of polycyclic aromatic hydrocarbons (PAHs) in a sensitive marine environment, the Northern Adriatic Sea (Mediterranean Sea). The persistence and sorption of complex PAH mixtures were analysed in the laboratory in conditions mimicking open-sea and coastal sediments, which differ in grain size and organic carbon content and are characterized by different oceanographic conditions including abiotic influences. The study investigated how sediment type and texture and salinity, temperature and solar irradiation conditions affect the partitioning of low molecular weight (LMW) and high molecular weight (HMW) PAHs into aqueous and solid phase, which critically influence their behaviour. With regard to the change from offshore to coastal conditions, HMW PAHs were found to be more sensitive to the increased salinity (from 21 to <37 parts per thousand), whereas LMW PHAs were more sensitive to the temperature increase (from 11 to 22°C). HMW PAHs were more affected by sediment type changes in terms of distribution coefficient (K d ). Since the physicochemical properties of organic pollutants affect their distribution, transport, bioavailability and toxicity, analysing the accumulation and persistence of dissolved pollutants can provide useful information for environmental risk assessment and management.

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Effect of salting out on the desorption-resistance of polycyclic aromatic hydrocarbons (PAHs) in coastal sediment

Cited by 42 publications

References 25 publications

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Formation of oxygenated polycyclic aromatic hydrocarbons from polycyclic aromatic hydrocarbons during aerobic activated sludge treatment and their removal process

Polycyclic Aromatic Hydrocarbon Degradation and Sorption Parameters in Coastal and Open-Sea Sediment

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