ABSTRACT
The endocrine disrupter Atrazine was oxidized by O3/H2O2 system and the products were analyzed to assess the degradation efficiency of Atrazine. When it's initial content was 2 mg/L and O3 dosage was 7.5 mg/L, Atrazine was removed about 27.2% after 5 minutes. Under the same condition, H2O2/O3 molar ratio was 0.75, Atrazine maximum removal rate reached 96.5%, which suggested that Atrazine could be degraded by O3/H2O2 system effectively. Ion Chromatography (IC) analysis showed that concentrations of chloride and nitrate ions were increasing along with the Atrazine content decreasing. Gas Chromatography-Mass spectrometry (GC-MS) and Liquid Chromatography-Mass spectrometry chromatograms (LC-MS) analyzing illuminated the existence of de-ethyl-atrazine, de-isopropyl-atrazine and de-chloro-atrazine, which indicated the Atrazine could not be destroyed completely by O3/H2O2 system. Consequently, it should be combined with GAC (Granular Activated Carbon) or other techniques while used as primary treatment unit or emergency measure.
Subject(s)
Atrazine/isolation & purification , Hydrogen Peroxide/chemistry , Ozone/chemistry , Water Pollutants, Chemical/isolation & purification , Water Purification/methods , Atrazine/chemistry , Endocrine Disruptors/chemistry , Endocrine Disruptors/isolation & purification , Gas Chromatography-Mass Spectrometry , Oxidation-Reduction , Water Pollutants, Chemical/chemistryABSTRACT
The endocrine disrupter simazine was oxidized by O3/H2O2 and the reactive productions was analyzed by chromatography to assess the degradation efficiency of Simazine. The initial content of Simazine 2 mg/L was removed about 87.1% by O3H2O2 system when the O3 was dosed as 10.0 mg/L, the H2O2/O3 molar ratio was 0.70, the temperature was 26 degrees C and pH 7-8, which indicated Simazine could be conveniently removed by O3/H2O2 system in ordinary reactive condition. The simazine removal ratio in tap water was 10% more than it in purified water up to 86.9%. The removal of simazine was decreased when the content of humic acid (HA) was high, whereas it was increased while low content HA in water. Also, the removal efficiency was inhabited by hydrogen carbonate fairly. The deethyl-simazine (DES) was trapped by Gas Chromatography Mass Spectrum(GC-MS) which was also certificated by analyzing the Liquid Chromatography Mass Spectrum (LC-MS) of the products. The Ion Chromatography spectrum showed the existing of de-chloro-procedure and breakage of triazine ring. Which indicated the oxidizability of O3/H2O2 system was fairly strong.
