Abstract
THERE has been, to date, no reagent available for detecting and measuring the minute traces of free chlorine such as occur in drinking water, etc., after sterilization. It should be emphasized that the usual methods employed do not measure free chlorine, but rather indicate oxidative potential, and results so given are, therefore, subject to considerable errors should oxidizing agents other than chlorine be present in the solution. Thus the popular ortho-tolidine technique1 is considerably affected if iron and similar metallic salts are present, and also gives a modified colour if the oxidation potential is diminished, as occurs when ammonia salts are present. Similarly, the benzidine blue2 and iodide replacement methods3 are likewise affected. Because of these complications, Palin4 introduced a modification of the p-aminodimethylaniline test, with which it was claimed a more specific result was possible. But this reagent is still an oxidation indicator, and therefore on occasion the test must be effected by substances other than chlorine.
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References
Ellms, J. W., and Hauser, S. J., Indust. Eng. Chem., 5, 915 (1913).
Stratton, R. C., Ficklen, J. B., and Haugh, W. A., Indust. Eng. Chem., Anal. Ed., 4, 2 (1932).
Linn, H. Enslow, Proc. Sec. Ann. Conf. Maryland Water and Sewage Assoc., 29–49 (1928).
Palin, A. T., Analyst, 70, 203 (1945).
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MILTON, R. New Test for Free Chlorine or Bromine. Nature 164, 448 (1949). https://doi.org/10.1038/164448a0
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DOI: https://doi.org/10.1038/164448a0
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