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《Journal of Safety and Environment》 2006-06
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Determination of the residual chlorine in water supply by thiourea decolored UV-spectrophotometry

LI Meng-yao,QIAN Hui,LU Jin-nan (School of Environmental Science and Engineering,Chang'an University,Xi'an 710054,China)  
The present paper is inclined to introduce a new method for determining the residual chlorine in water supply by thiourea decolored UV-spectrophotometry.The method is based on the depression of thiourea ultraviolet absorption caused by the oxidization of chlorine,which is proportional to the density of the above said residual chlorine in water.It is found that when pH=1-6,HCl medium and sodium hypochlorite solution is taken as a standard,the absorption depression value of thiourea and chlorine density within the range of 0-8.0 mg/L would obey the Beer Law with a correlation coefficient of 0.999 4 on the condition that the absorption wave and concentration of thiourea is detected to be 10 mg/L in 237 nm.Some common coexisting ions,such as Na~+,K~+,NH~+_4,and so on wouldn't give any interference.As a result,the preliminary applications of our method to such water supplies as tap water and swimming pool water indicate that the chlorine-sign-return ratio stands between 98%-103% and the method is efficient,feasible,convenient as well as reliable.
【CateGory Index】: X832
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