The Determination And Survey About Haloacetic Acids In Water

Disinfection is an effective water treatment means to control waterborne diseases in water treatment process.Due to the reactions between the disinfectants and Nature Organic Matter(NOM) in drinking water ,organic disinfection byproducts (DBPs) are formed during water disinfection. Haloacetic acids(HAAs) are a major group of DBPs in chlorinated drinking water found in 1980s.It was proved that HAAs was greatly harmful to our health. So it is urgent for us to study the character about HAAs and find some control measure for it.To better control the formation of HAAs in drinking water, a reliable and accurate analytic method is needed for HAAs monitoring. In this study the analytic method of 4 HAAs: MCAA,DCAA,TCAA,MBAA by GC-MS was found firstly. Secondly this study investigated the quantity of four HAAs in water of a water-supply works in North China using the GC-MS method. At last the study try to find another easily analytic method for 6 HAAs: MCAA,DCAA,TCAA,MBAA,DBAA,BCAA by LC-MS.Through this study, we can draw some conclusins.The GC-MS analytic method was a relatively successfull method.The four HAAs and the internal standard solution were seperated well and they also got a high sensitivity of 1μg/L. The water quantity investigation result showed that the conventional treatment process had a little control to the production of HAAs. Prechlorination may result in a great increase of HAAs in conventional treatment process, so we tried to use K2MnO4 preoxidation , floatation, filtration, ozonation, active carbon adsorption, chlorination and ammonia disinfection to control HAAs. This advanced treatment process decreased HAAs from 79.31μg/L to 3.92μg/L which showed a better control to HAAs than conventional treatment process relativily. The LC-MS analytic method result showed that the 6 HAAs were separated very well but thesensitivity needed to be increased further.The analytic method of this study is relatively successful. It is the survey foundation of HAAs. The method still has some deficiency and shortcoming, so more study about haloacetic acids should be done to perfect our water quantity standard.