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Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
As a traditional disinfection method, chlorination disinfection can reduce virus and bacteria in drinking water effectively, However, undesirable disinfection by-products (DBPs) during chlorination process generate accordingly. Nitrogenous organic compounds are important precursors of DBPs. Trihalomethanes (THMs) is one of the main DBPs. Tyrosine(Tyr) is one kind of elementary amino acids which are typical nitrogenous organic compounds. In this paper, the formation characteristics of THMs by Tyr under different chlorination disinfection conditions have been researched. The influencing factors were investigated, such as reaction time, chlorine dosage, pH, temperature and Br-. The results show that the yields of chloroform(CF) is increased with the reaction time increasing, and the CF formation rates is accelerated at the initial period; With the increase of chlorine dosage, the yields of CF increased; The yield of CF is low in the acidic condition and high in the conditions of neutral and alkaline conditions. The yield of CF is increased with the increase of temperature. When there is Br- in water, bromided-THMs can be formed. The total THMs yield and the bromine speciation ratio n both increase with the increase of Br- concentration. The THMs constituents contain CF, Bromodicloromethane(DCBM), Dibromochloromethane (DBCM) and Tribromomethane(BF). At low Br- concentration, the order of THMs constituents yields is CF>;DCBM>;DBCM>;BF, and at the high Br- concentration, the order is just on the contrary.