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Evaluation method and evaluation system of free hypohalous acid concentration

  • US 6,617,168 B1
  • Filed: 01/06/1999
  • Issued: 09/09/2003
  • Est. Priority Date: 01/08/1998
  • Status: Expired due to Fees
First Claim
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1. An evaluation method of free hypohalous acid concentration comprising:

  • forming a main flow path of a sample liquid for evaluation through which the sample liquid flows and a sub-region that communicates with said main flow path for trapping sample liquid therein, said sub-region having no outlet for said trapped sample liquid during evaluation of said free hypohalous acid concentration;

    decomposing free hypohalous acid in the trapped sample liquid by a free hypohalous acid decomposing substance in said sub-region;

    installing a potential-measuring electrode in said main path, while installing a reference electrode in said sub-region at a position where free hypohalous acid of the trapped sample liquid has been decomposed; and

    evaluating the free hypohalous acid concentration from the electric potential difference between said reference electrode and said potential-measuring electrode.

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