Abstract
Redox control of breakpoint chlorination of ammonia and metal ammine complexes (Cu 2+, Ni 2+, Cr 3+, Zn 2+, Cd 2+) is investigated. In simulated waste streams it is shown that at pH 8 control is feasible with a large (400 mV) and reproducible increase in the potential of a gold or platinum indicator electrode occurring at the breakpoint. At pH 10 control is less practicable due to the slowness of response, irreproducibility and smaller magnitude of the potential change. Simultaneous pH control is critical.
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