Transcription of 4500-Cl CHLORINE (RESIDUAL)* 4500-Cl A. Introduction
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4500-Cl CHLORINE (RESIDUAL)* 4500-Cl A. Introduction
4500 -Cl CHLORINE ( residual )* 4500 -Cl A. of ChlorinationThe chlorination of water supplies and polluted waters servesprimarily to destroy or deactivate disease-producing microorgan-isms. A secondary benefit, particularly in treating drinking water,is the overall improvement in water quality resulting from thereaction of CHLORINE with ammonia, iron, manganese, sulfide, andsome organic may produce adverse effects. Taste and odor char-acteristics of phenols and other organic compounds present in awater supply may be intensified. Potentially carcinogenic chloroor-ganic compounds such as chloroform may be formed. Combinedchlorine formed on chlorination of ammonia- or amine-bearingwaters adversely affects some aquatic life. To fulfill the primarypurpose of chlorination and to minimize any adverse effects, it isessential that proper testing procedures be used with a foreknowl-edge of the limitations of the analytical Forms and ReactionsChlorine applied to water in its molecular or hypochloriteform initially undergoes hydrolysis to form free CHLORINE con-sisting of aqueous molecular CHLORINE , hypochlorous acid, andhypochlorite ion.
orthotolidine. The leuco crystal violet (LCV) procedure was dropped from the 17th edition because of its relative difficulty and the lack of comparative advantages. a. Natural and treated waters: The iodometric methods (B and C) are suitable for measuring total chlorine concentrations greater than 1 mg/L, but the amperometric end point of Methods
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