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Gas dosimeter for colorimetrically indicating the presence of amides

  • US 4,840,919 A
  • Filed: 03/03/1987
  • Issued: 06/20/1989
  • Est. Priority Date: 03/03/1987
  • Status: Expired due to Fees
First Claim
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1. A method for colorimetrically indicating the presence of aromatic amines which comprises exposing the aromatic amines to a chromophoric reagent comprising 1,2 naphthoquinone-4-sulfonic acid or a derivative of 1,2 naphthoquinone-4-sulfonic acid and an effective concentration of a buffering agent to maintain the pH of said reagent less than 4.5, and observing the change in color of said reagent.

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