Method of analyzing low levels of peroxyacetic acid in water
AssigneeEnviro Tech Chemical Services, Inc.
InventorsJonathan Howarth, Michael Harvey
Life of this patent
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Abstract
Methods of analyzing low levels of peroxyacetic acid (PAA) in water are described. These methods employ buffering the PAA-containing water and the use of a N,N-diethyl-p-phenylenediamine (DPD) indicator system in the presence of iodide ion. The intensity of the pink coloration that develops is quantitated by colorimetric or titrimetric methods and correlated to the ppm PAA in the water. Positive interference effects due to the presence of hydrogen peroxide are eliminated by performing the analyses quickly after the introduction of the reagents.
Claims13
A method for determining the concentration of peroxyacetic acid in water, comprising:
- a) obtaining a sample of water to be tested;
- b) adding buffer, DPD indicator, and iodide ion to said sample;
- c) allowing a pink color to develop in said sample;
- d) reading the apparent concentration of total chlorine in said sample using a colorimetry method;
- and
- e) converting said apparent concentration of total chlorine in said sample to the actual concentration of peroxyacetic acid in said sample.
A method for determining the concentration of peroxyacetic acid in water, comprising:
- a) obtaining a sample of water to be tested;
- b) adding buffer, DPD indicator, and iodide ion to said sample;
- c) allowing a pink color to develop in said sample;
- d) reading the apparent concentration of total chlorine in said sample using a titration method;
- and
- e) converting said apparent concentration of total chlorine in said sample to the actual concentration of peroxyacetic acid in said sample.
Dependencies are inferred from the claim text.