Method of and system for determining particular species of chlor

Details Method of and system for determining particular species of chlor Method of and system for determining particular species of chlor

1981-12-07

1983-07-05

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing liquid or solid sample

204415, 422 80, 422 81, 436125, 436126, 436151, G01N 2712, G01N 3300

Patent

active

043917755

ABSTRACT:
A technique for determining and distinguishing between specific species of chlorine in a supply of water is disclosed herein along with certain applicable apparatus. In carrying out this technique, one or more water samples are obtained from a larger supply and made to display a pH within a specific range. In a preferred embodiment, a sample is provided for each of the different species of chlorine to be determined. A predetermined amount of hydrogen peroxide is added to each of these samples. If hypochlorous acid and/or hypochlorite (one of the species to be determined) is present in any of the samples, the hydrogen peroxide by itself will react therewith for producing oxygen. If however either monochloramine or dichloramine (other chlorine species) is present, it is necessary to combine the hydrogen peroxide with a certain minimum amount of iodine, preferably in the form of potassium iodide, to produce an oxygen evolving reaction. Dichloramine requires a greater concentration of iodine than monochloramine and, hence, the two can be distinquished from one another. In each case, the produced oxygen is detected for determining whether any or all of these chlorine species are present in the water supply and the amounts thereof.

REFERENCES:
patent: 3413199 (1968-11-01), Morrow, Jr.
patent: 3556950 (1971-01-01), Dahms
patent: 3838034 (1974-09-01), Groves
patent: 3857771 (1974-12-01), Sternberg
patent: 4049382 (1977-09-01), Ross, Jr. et al.

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