# US 2018/0024103 A1 · Methods and systems for detecting and quantifying peroxyacid and peroxide in fluids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024103 A1 - Document ID: US20180024103A1 - Status: Published application - Kind: A1 - Application number: 15/653,895 - Filed: 2017-07-19 - Published: 2018-01-25 - Earliest claimed: 2016-07-19 - Assignees: Chemtreat, Inc. - Applicants: Chemtreat, Inc. - Inventors: John RICHARDSON; Mark PUCHOVICH; Benjamin NIEMASECK; Kevin WHITE; James WILKINS; Robert BEDINGER - Web page: https://patentgrep.com/patent/US20180024103A1 ## CPC - G01N 31/228: {for peroxides} - B01L 3/502: {with fluid transport, e.g. in multi-compartment structures} - C12Q 1/30: involving catalase - C12Y 111/01006: Catalase (1.11.1.6) - G01N 31/225: {for oxygen, e.g. including dissolved oxygen} - B01L 2200/16: Reagents, handling or storing thereof - B01L 2300/0627: Sensor or part of a sensor is integrated - G01N 2333/908: acting on hydrogen peroxide as acceptor (1.11) - Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE - C12Q: MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS (immunoassay G01N33/53); COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES - C12Y: ENZYMES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Methods and systems are disclosed for analyzing and treating a fluid containing a peroxyacid and/or peroxide. A method of analyzing the fluid includes introducing into the fluid a decomposition agent that catalyzes decomposition of the peroxyacid and/or peroxide into decomposition products including oxygen, then directly or indirectly measuring an amount of oxygen produced after introduction of the decomposition agent, and determining an amount of the peroxyacid and/or peroxide present in the fluid. The amount of peroxyacid and/or peroxide in the fluid can also be monitored and controlled by further adjusting the amount of the peroxyacid and/or peroxide in the fluid based on the determined amount thereof. A system for performing the methods includes a decomposition agent infusion device for introducing the decomposition agent into a fluid sample, and a sensor for directly or indirectly measuring an amount of oxygen produced after introduction of the decomposition agent. ## Claims ### Claim 1 A method of analyzing a fluid that includes at least one of peroxyacid and peroxide, the method comprising: introducing into 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; and determining an amount of the peroxyacid and/or peroxide present in the fluid based on the measured amount of oxygen. ### Claim 2 (depends on 1) The method according to claim 1, wherein, in the measuring step, an amount of dissolved oxygen produced in the fluid after the introduction of the decomposition agent is directly measured. ### Claim 3 (depends on 2) The method according to claim 2, further comprising directly measuring an amount of dissolved oxygen in the fluid before introducing the decomposition agent into the fluid. ### Claim 4 (depends on 1) The method according to claim 1, wherein the fluid has been treated such that it is substantially free of peroxide and is in a gaseous phase before the introduction of the decomposition agent. ### Claim 5 (depends on 4) The method according to claim 4, wherein, in the measuring step, an amount of oxygen produced in the gaseous fluid after the introduction of the decomposition agent is directly measured. ### Claim 6 (depends on 1) The method according to claim 1, wherein, in the measuring step, the amount of oxygen produced is indirectly measured by measuring a change in pressure in a system containing the fluid after the introduction of the decomposition agent. ### Claim 7 (depends on 1) The method according to claim 1, wherein the peroxyacid is peracetic acid. ### Claim 8 (depends on 1) The method according to claim 1, wherein the decomposition agent is selected from the group consisting of catalase, sodium hypochlorite, metal catalyst, alkaline solution, haloamine, and ultraviolet light. ### Claim 9 (depends on 1) The method according to claim 1, further comprising adjusting the pH of the fluid to be in a range of from 6.5 to 11.5. ### Claim 10 (depends on 1) The method according to claim 1, wherein the measuring step is performed after partial decomposition of the peroxyacid and/or peroxide in the fluid. ### Claim 11 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. ### Claim 12 (depends on 11) The method according to claim 11, wherein, in the adjusting step, the amount of the peroxyacid and/or peroxide in the fluid is adjusted to be within a predetermined range. ### Claim 13 (depends on 11) The method according to claim 11, wherein, in the adjusting step, the amount of the peroxyacid and/or peroxide in the fluid is adjusted by adding more of the peroxyacid and/or peroxide into the fluid to increase the amount thereof in the fluid. ### Claim 14 (depends on 11) The method according to claim 11, wherein, in the adjusting step, the amount of peroxyacid and/or peroxide in the fluid is adjusted by introducing a neutralization agent into the fluid to decrease the amount of the peroxyacid and/or peroxide in the fluid. ### Claim 15 (depends on 14) The method according to claim 14, wherein the neutralizing agent is selected from the group consisting of bisulfate, erythorbate, cerium (III), catalase, sodium hypochlorite, metal catalyst, alkaline solution, haloamine, and ultraviolet light. ### Claim 16 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. ### Claim 17 (depends on 16) The system according to claim 16, further comprising a controller that is configured to: determine an amount of the peroxyacid and/or peroxide in the fluid based on the measured amount of oxygen; and control an amount of peroxyacid and/or peroxide, or an amount of a neutralization agent, that is introduced into the fluid based on the determined amount of the peroxyacid and/or peroxide in the fluid. ### Claim 18 (depends on 16) The system according to claim 16, wherein the sensor is an oxygen sensor that is configured to directly measure an amount of dissolved oxygen produced in the fluid sample after introduction of the decomposition agent into the sample. ### Claim 19 (depends on 16) The system according to claim 16, wherein the sensor is a pressure sensor that is configured to indirectly measure the amount of oxygen produced by measuring a change in pressure in a closed system containing the sample after introduction of the decomposition agent into the sample. ### Claim 20 (depends on 16) The system according to claim 16, further comprising a neutralization agent infusion device configured to introduce a neutralization agent into the fluid.