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Phthalate esters (PEs) are important classes of chemical endocrine-disrupting compounds. PEs is mainly used as plasticizers.
These compounds are easily released into the environment because there is no covalent bond between the phthalates
and plastics in which they are mixed. In this study the effect of environmental parameters such as time contact, temperature
and salinity on adsorption process of 6 PEs on the sediments of the north-west of Persian Gulf was investigated. Also, the
adsorption isotherms and kinetic parameters have been studied. The results showed that the adsorption of PEs is very fast and
reach the equilibrium within 6 hours and after this duration only a small change was observed. Among the various PEs, dinormal
puthyl phthalate ester (DOP) showed the most adsorption tendency to the studied sediments with average value 613.65
μg, g-1. Several kinetic models have been investigated; pseudo-second order equation was best fitted to the adsorption behavior
of PEs with marine sediments at different contact times and film diffusion is the rate limiting step. The sorption equilibrium
results could be well described by linear isotherm. This means that in PEs sorption process on marine sediments partition
domain is dominated over the whole filling domain. After H2O2 oxidation of sediments, the Kd values were redused by average
64.82%. It means that amorphous organic carbon fraction involve the major part of total organic carbon in sediments. PEs
sorption isotherms on treated sediments follow the nonlinear models. By increasing the temperature, the adsorption of PEs
on sediments was decreased indicating that the process is exothermic. It was also in thermodynamic study ΔH0<0. The mines
value of ΔG0 for these compounds showed the spontaneous sorption process for them. It be noted that mechanism was carried
out with decreasing in entropy. These research findings have a prime importance on assessment of the fate and transport PEs
in seawater-sediment systems.
Biography
Somaye Mohammadian is working in a microalgae production company and she is a PhD student in analytical chemistry from Tabriz University. She completed
her master degree in marine chemistry from Khorramshar marine science and technology. She has a paper with title of ?Investigation of thermodynamic and kinetic
behavior sorption of phthalate esters on marine sediment? that is inpress.
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