Pathway of diethyl phthalate photolysis in sea-water determined by gas chromatography-mass spectrometry and compound-specific isotope analysis.
作者： Xuewei Peng , Lijuan Feng , Xianguo Li
DOI: 10.1016/J.CHEMOSPHERE.2012.06.045
关键词:
摘要: Abstract The degradation mechanism of diethyl phthalate (DEP) in natural seawater under UV irradiation was investigated using a combination intermediates detection and determination stable carbon isotopic fractionation. Typical identified with gas chromatography–mass spectrometry (GC–MS) were mono-ethyl (MEP) phthalic anhydride. Stable isotope signature determined by chromatography coupled ratio mass through combustion interface (GC–C–IRMS). A profound 13C enrichment, δ13C shift 12.3 ± 0.3‰ (f = 0.09) residual DEP molecule, clearly an indicator to its photolysis. reactive position enrichment factor (ereactive position) apparent kinetic effects (AKIE) −35.25 ± 2.26‰ 1.075, respectively, indicating that the initial reaction step cleavage C O bond Based on these observations, pathway proposed. First, molecule broken form MEP. Then, MEP further degraded Our work demonstrates compound-specific analysis (CSIA), when combined analysis, is reliable measure deduce This approach might be extended as reference for investigation complicated environment systems.
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