Analysis of the Chemistry Associated with Ozonolysis of Organic Pollutant Molecules in Water

摘要

This study sought to examine the chemistry and rates of chemical oxidation and to identify compounds residual from ozonation of organics identified in sewage treatment plant water. An all-glass system was constructed to ozonize aqueous solutions of trace organics, modified to contained quartz reaction cells for UV irradiation and to reduce sparging. Products and product yield rates were determined by instrumental analysis, including gas chromatography (GC), GC-mass spectrometry, pulsed Fourier transform nuclear magnetic resonance, and an assembled linear array photo-detector-computer system for laser-induced narrow-line low-temperature fluorescence spectra of trace organic concentrations. Toxic compounds studied for ozonation, oxidation products analysis, and reaction kinetics were phenol, the three chlorophenol isomers, dibenzofuran as a model for its toxic chlorinated analogs, and chloroform. Large differences were noted in the ozonolysis rates of the three chlorophenol isomers. It was also determinated that dibenzofuran ozonolysis was much faster in water than in organic solvents. Matrix isolation fluorescence was also examined as a trace technique for polycyclic aromatic hydrocarbons. It was sought to study ozonolysis to determine conditions for removal of toxic or suspect carcinogens resulting from chlorine treatment of sewage organics.