3. FOOD ChEMISTRy & bIOTEChNOLOGy 3.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Food Chemistry & Biotechnology
of the total PET area, while the total area adsorbed onto PS
from water is equal to 50.7 %. These values indicate that the
PCBs removal from water could be classified as monomolecular
adsorption on the plastic surfaces. The values of PCB
diffusion coefficients in water, calculated from equation (1)
for both experimental systems are not very different which
indicates that the same physicochemical processes take place
in the PCB removal process from water. The curves of PCBs
concentration vs. time are subject to measurement uncertainties
that propagate into the values of D.
Conclusions
The results and findings of this work lead to the following
conclusions:
• The PCB concentration in the water filled into PET and
PS receptacles decreases due to adsoption of PCBs onto
the surface of plastics.
• The interaction PCB – plastics can be classified as a
monomolecular adsorption of PCBs on the polymer surface
so that it can be expected that the adsorption equilibrium
will obey the Langmuir isotherm.
• The values of diffusion coefficients obtained enable to
predict the rate of PCB elimination at any time of the
interaction; the values of the distribution coefficients
characterize the extent of the PCBs removal.
• Although both polymers are suitable for PCB removal,
PS is far more effective in comparison with PET.
This work was supported by the Science and Technology
Assistance Agency of Slovak Republic under the contract No.
APVT-27-002204.
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