STUDY OF EXTRACTION AND DETERMINATION OF CHLORINATED COMPOUNDS IN TREATED DRINKING WATER OF TEHRAN

Chlorine was used for disinfecting drinking water in treatment plants. Disinfection of drinking-water is essential to protect the public from outbreaks of waterborne infectious and parasitic diseases. Chlorine inactivates a wide variety of pathogens and its effects are relatively long lasting. However, a major drawback associated with the use of chlorine as a disinfectant is its potential to react with naturally occurring organic matter (NOM) present in raw water sources to form a number of disinfection by-products (DBPs). Trihalomethans, haloacetonitriles, haloacetic acids and mx are four important groups of disinfection by-products that are caused by chlorine. There are several methods for extracting and determinating chlorination by-products but EPA standard method is the best. Methyl Tert-Butyl Ether (MTBE) commonly was used for extracting by-products in EPA methods. In this study MTBE used as extracting solvent and rotary evaporator reduced the combined MTBE to a few milliliters that were subsequently injected to GC-MASS for determination chlorinated organic compounds. There are several chlorinated compounds exist in drinking water of Tehran. AMDIS GC-MS analysis report suggested different compounds of DBPs that they are harmful to human health. The method described enables simultaneous determination of chlorinated compounds with low detection limits and excellent precision.