Journal Title
Title of Journal: Water Qual Expo Health
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Abbravation: Water Quality, Exposure and Health
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Publisher
Springer Netherlands
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Authors: Rodrigo LoyolaSepulveda Stephen M Mudge Claudio BravoLinares
Publish Date: 2013/01/18
Volume: 5, Issue: 1, Pages: 1-9
Abstract
The formation of trihalomethanes THMs during water disinfection is related to several parameters such as water temperature free chlorine and availability of dissolved organic matter This paper compares and quantifies the THMs in drinking water from Concepción city in the Bío Bío Region of central Chile during summer of 2007 and autumn–winter 2008THM concentrations in the source water were low 0001–0023 μg L−1 The concentration ranges in summer sampling period for the drinking water were 97–1116 01–10 and 09–255 μg L−1 for chloroform CHCl3 and dibromochloromethane CHClBr2 and bromodichloromethane CHCl2Br respectively and 54–1820 01–09 09–352 μg L−1 respectively for the autumn–winter sampling period Bromoform was not detected in any sampleThere were significant correlations between the THMs concentration and residence time of the water into the network distance from the treatment plant and an inverse correlation to free chlorine and UV absorbance In this system temperature was not a major factor in the THM concentrations at the point of use although lower overall concentrations were measured in summer The Additive Toxicity Index Value 007–14 for winter samples indicated that the Chilean Norm was exceeded at the more distant water utilisation points where the residence time in the system was 600 minutes This was not the case in summer as utilisation rates were greater reducing the residence times Dichloromethane DCM was also detected at elevated concentrations in the water supply and exceeded the Chilean Norm 20 μg L−1 at all points in the system up to 12 times and may pose more of a health risk than the THMsWe would like acknowledge Mrs Ana Maria Lezcano Mr Edgardo Figueroa Mr Wilson Lozano and the personnel of ESSBIO for their assistance during sampling We would also like to dedicate this article to the cities of Concepción and Talcahuano that were affected by earthquake and tsunami past 27th February 2010
Keywords:
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