Methods and systems for detecting and quantifying peroxyacid and peroxide in fluids

A method of monitoring and controlling an amount of peroxyacid and/or peroxide in a fluid, the method comprising:

• introducing into a sample of the fluid a decomposition agent that decomposes the peroxyacid and/or peroxide into decomposition products including oxygen;
• directly or indirectly measuring an amount of oxygen produced after the introduction of the decomposition agent;
• determining an amount of the peroxyacid and/or peroxide present in the fluid based on the measured amount of oxygen;
• and
• adjusting the amount of the peroxyacid and/or peroxide in the fluid based on the determined amount thereof.

A system for analyzing and treating a fluid containing at least one of peroxyacid and peroxide, the system comprising:

• a sample collector configured to collect a sample of the fluid;
• a decomposition agent infusion device configured to introduce into the sample a decomposition agent that decomposes the peroxyacid and/or peroxide into decomposition products including oxygen;
• and
• a sensor configured to directly or indirectly measure an amount of oxygen produced after introduction of the decomposition agent into the sample.