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Chlorination of waters containing natural organic matter (NOM) produces disinfection by-products (DBPs) including harmful THMs and HAAs. A collective parameter and toxicity index of all chlorination products contained in finished water is the total concentration of organic-bound halogen compounds (TOX). Determination of this indicator is carried out by adsorption-pyrolysis method, which is complicated and requires specialized apparatus. The competitive method of TOX concentration determination in water is differential absorbance. Effect of natural organic matter removal from surface waters in coagulation as well in coagulation and adsorption processes on the decrease of TOX concentration measured by differential absorbance was determined.

Differential absorbance as evaluation method of TOX concentrations generated during surface water chlorination