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

Öz

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.

Anahtar Kelimeler

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

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