4500-Cl CHLORINE (RESIDUAL)* 4500-Cl A. Introduction
monia or by the addition of ammonia or ammonium salts. Chlo-rinated wastewater effluents, as well as certain chlorinated in-dustrial effluents, normally contain only combined chlorine. His-torically, the principal analytical problem has been to distinguish between free and combined forms of chlorine. 3. Selection of Method
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