Abstract
The bacteriological examination of water is the surest and final test of the correct dosage of chlorine; this method is constantlyapplied to control chlorination. However, since this method requires considerable time 24 to 72 hours, the development of more rapid chemical methods appears desirable. Active chlorine can be determined by various methods: according to Ellms and Hauser (1) with ortho-tolidine; according to Olszewski (2) with benzidine, and by Bruns (3) iodometric method, etc. Of these the ortho-tolidine and iodometric methods are the ones most
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