Investigation of Degradation Mechanism for dimethyl phthalate (DMP) in aqueous solution by using analytical methods

Year 2019, NSP2018 Special Issue, 125 - 141, 28.03.2019

Masoomeh Mehrnia , Murat Torun , Dilek Şolpan

Abstract

Organic compounds called endocrine disruptors
cause health problems by altering the functioning of the endocrine system in a
healthy organism or its future generation. In this study, phthalate acid esters (PAE’s) type of endocrine disruptors were chosen as model compounds and the degradation of dimethyl
phthalate (DMP) in aqueous solution was investigated under a variety of
reaction conditions using hydrogen
peroxide. In
order to increase the efficiency of degradation of DMP and intermediates which
may be toxic, H₂O₂ was used as hydroxyl radical
(oxidizing agents) sources in addition to water radiolysis products. To examine the effect of hydrogen
peroxide concentration to decompose of DMP, different hydrogen peroxide
concentrations (0.6-4.8 mM) was chosen and as a result of the findings obtained
from the comparison of the results, 4.8 mM hydrogen peroxide was determined to
provide the optimum condition for decomposition of 25 mg L^-1 DMP
solution. Changes in amounts of the remains
DMP, dissolved oxygen (DO), total acidity, and formaldehyde with irradiation
time were followed.  The qualitative
analysis of the DMP and the intermediates resulted from degradation of DMP were
performed using a high performance liquid chromatography (HPLC), gas
chromatography associated to mass spectrometry (GC–MS) and ion chromatography
(IC). The results showed that 99.44% of DMP can be removed during 20
min UV radiation time in the presence of 4.8 mM hydrogen peroxide.

Keywords

Endocrine disruptors, degradation of dimethyl phthalate (DMP), advanced oxidation process (AOP’s), phthalate acid esters (PAEs), (UV/H2O2)

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