Abstract
A higher enrichment of organic pollutant, di(2-ethylhexyl) phthalate (DEHP) was found in estuary of Oyabe River and Jinzu River, Japan. Based on this, the distribution of DEHP between water and bed sediment was investigated as a model of organic pollutant through both the field investigation and laboratory experiment. The laboratory experiment was performed to examine the effect of seawater, organic matter in sediment and hydrophobicity (log Kow) of organic pollutants. The result showed that salting-out effect due to the high salinity in seawater and organic matter in sediment contributed towards the increasing of DEHP distribution between water and sediment. Furthermore, the hydrophobicity of organic pollutant also enhances the distribution between water and sediment to a higher magnitude in the presence of seawater.
Highlights
Phthalate esters are widespread environmental contaminants (Giam et al 1978; Thurén and Larsson 1990; Ma et al 2013)
Reagents and apparatus Phthalate esters (DEHP, di-n-butyl phthalate (DnBP), di-n-hexyl phthalate (DnHP), di-n-octyl phthalate (DnOP) and di-n-pentyl phthalate (DnPP)) standard solution was obtained from Tokyo Chemical Industry, Japan. α-Naphthoquinoline standard solution and nitrobenzene standard solution were purchased from Wako chemicals, Japan
It is considered that the effect of seawater and sediment characteristics contribute towards the enhancement of the di(2-ethylhexyl) phthalate (DEHP) distribution between water and sediment and this will be elaborated
Summary
Phthalate esters are widespread environmental contaminants (Giam et al 1978; Thurén and Larsson 1990; Ma et al 2013). Phthalates only exhibit subtle toxicity to aquatic organisms (Giam et al 1984; DeFoe et al 1990). Monitoring uptake of a radiolabelled analogue by natural estuarine particles Their laboratory experiments have shown that more than 50% of DEHP discharged to a catchment maybe retained in the estuary, at least with respect to a timescale equivalent to the estuarine particle residence time. The studies on the behavior of organic pollutants distribution in estuary region were mostly performed under simulated experiment in laboratory. The distribution of DEHP between water and sediment and suspended solid at estuary were investigated to further enhance our understanding on the transport and fate of DEHP in aquatic environment. Nitrobenzene, αnaphtoquinoline, di-n-butyl phthalate (DnBP), di-n-hexyl phthalate (DnHP), di-n-octyl phthalate (DnOP) di-n-pentyl phthalate (DnPP) and DEHP were used as model chemicals which have a different octanol/water partition constant (Kow)
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