Abstract
Disinfection is important in the supply of safe drinking water. Chlorination is the major disinfectant process for drinking water. However, the reaction between the disinfectant and the organic matter could form disinfection by-products like trihalomethanes (THMs). The study was done in order to check the presence of chlorination by-products in the drinking water system in Muscat. This study presented the monitoring results of Muscat with collaboration with the Public Authority of Electricity and Water (PAEW) in the period of June 9, 2013 to August 1, 2013. Seventeen drinking water reservoirs were selected to assess the presence of the chlorination by-products. The chlorination by-products were analyzed or detected by using Gas Chromatography Mass Spectrometry (GCMS). According to the analyses, the concentration of the THMs did not exceed 0.3 ppb. Chloroform, bromodichloromethane and dibromochloromethane concentrations did not exceed 1.6 ppb while the bromoform reached 28 ppb. Therefore, the results showed that the bromoform concentration is the most dominant THM species observed in all the samples. The bromoform and the THMs concentrations did not exceed the maximum value of the Omani standard for drinking water (1 mg/l). The drinking water quality in the Muscat Governate is considered to be of high water quality based on the THM standards. Thus, at present, there is no health concern associated with the presence of THMs in drinking water.
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