# US 7,744,815 B2 · Device for determining chlorine dioxide and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,815 B2 - Document ID: US7744815B2 - Status: Granted - Kind: B2 - Application number: 11/860,621 - Filed: 2007-09-25 - Published: 2008-03-27 - Granted: 2010-06-29 - Earliest claimed: 2006-09-26 - Assignees: Dräger Safety AG & Co. KGaA - Inventors: Holger Bohm; Andreas Mohrmann; Bettina Runge; Armin Schulten - Web page: https://patentgrep.com/patent/US7744815B2 ## CPC - G01N 31/224: {for investigating presence of dangerous gases} - G01N 21/783: {for analysing gases} - Y10T 436/19: Halogen containing - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A device and a method are provided for determining chlorine dioxide, especially in the presence of chlorine as a foreign gas. In the device the gas sample is exposed at first to a reagent for removing chlorine and subsequently to an indicator or to an electrochemical cell for the qualitative and/or quantitative determination of chlorine dioxide. The reagent for removing chlorine is or contains cyclohexylsulfamic acid and/or salts thereof. The device, through which flow can take place may be a test tube. ## Claims ### Claim 1 A device, through which a gas sample can flow, for detecting chlorine dioxide, the device comprising: a reagent flow space; a reagent in said flow space, said flow space to expose the gas sample to be analyzed to said reagent for removing chlorine, said reagent containing one or more of cyclohexylsulfamic acid and a cyclohexylsulfamic acid salt; and an indicator or an electrochemical cell forming a chlorine dioxide qualitative and/or quantitative determination means for a qualitative and/or quantitative determination of chlorine dioxide. ### Claim 2 (depends on 1) A device in accordance with claim 1, wherein the reagent for removing chlorine is sodium N-cyclohexyl sulfamate and/or calcium N-cyclohexyl sulfamate. ### Claim 3 (depends on 1) A device in accordance with claim 1, the indicator for chlorine dioxide is N,N-diethyl-p-phenylenediamine, alizarine violet 3R, 3,3′,5,5′-tetramethylbenzene-diphenylbenzidine, chiorophenol red, methylene blue, N,N,N′,N′-tetraphenylbenzidine, o-tolidine, o-dianisidine, 3,3′,5,5′-tetramethylbenzene-diphenylbenzidine, o-tolidine and/or o-dianisidine. ### Claim 4 (depends on 1) A device in accordance with claim 1, wherein: said reagent flow space comprises a test tube with said reagent therein; and said chlorine dioxide determination means comprises a test tube. ### Claim 5 (depends on 1) A device in accordance with claim 1, wherein the indicator is a colorimetric indicator. ### Claim 6 (depends on 5) A device in accordance with claim 5, wherein said colorimetric indicator is a benzidine derivative. ### Claim 7 (depends on 1) A device in accordance with claim 1, wherein said reagent flow space and said chlorine dioxide determination means together comprise a test tube, and said reagent and said indicator are stored in said test tube separated from each other by a separator. ### Claim 8 (depends on 7) A device in accordance with claim 7, wherein said separator includes quartz glass powder, in at least two separate containers or areas, which are connected for a flowing gas. ### Claim 9 (depends on 8) A device in accordance with claim 8, wherein the two containers or areas are part of said test tube and said test tube is transparent. ### Claim 10 A method for detecting chlorine dioxide in a gas sample, the method comprising: exposing the gas sample to be analyzed to a reagent for removing chlorine; and subsequent to said step of exposing the gas sample to the reagent, passing the gas sample to a chlorine dioxide determination means comprising an indicator or an electrochemical cell for the qualitative or quantitative determination of chlorine dioxide, wherein the reagent for removing chlorine is or contains one or more of cyclohexylsulfamic acid and a cyclohexylsulfamic acid salt. ### Claim 11 (depends on 10) A method in accordance with claim 10, wherein the reagent for removing chlorine is sodium N-cyclohexyl sulfamate and/or calcium N-cyclohexyl sulfamate. ### Claim 12 (depends on 10) A method in accordance with claim 10, wherein the indicator is N,N-diethyl-p-phenylenediamine, alizanne violet, 3,3′,5,5′-tetramethylbenzene-diphenylbenzidine, chlorophenol red, methylene blue, N,N,N′,N′-tetraphenylbenzidine, o-tolidine and/or o-dianisidine, 3,3′,5′,5′-tetramethylbenzene-diphenylbenzidine, o-tolidine and/or o-dianisidine. ### Claim 13 (depends on 10) A method in accordance with claim 10, wherein a defined quantity of sample gas is drawn through a reagent space containing the reagent and through the chlorine dioxide determination means by means of a hand pump, in order for the sample gas to be contacted with the reagent for removing chlorine, and for the quantitative determination of chlorine dioxide with the chlorine dioxide determination means. ### Claim 14 (depends on 10) A method in accordance with claim 10, wherein the reagent for removing chlorine consists essentially of cyclohexylsulfamic acid. ### Claim 15 (depends on 10) A method in accordance with claim 10, wherein the reagent for removing chlorine consists essentially of sodium N-cyclohexyl sulfamate. ### Claim 16 (depends on 10) A method in accordance with claim 10, wherein the reagent for removing chlorine consists essentially of calcium N-cyclohexyl sulfamate. ### Claim 17 (depends on 10) A method in accordance with claim 10, wherein the indicator is a colorimetric indicator. ### Claim 18 (depends on 17) A method in accordance with claim 17, wherein said colorimetric indicator is a benzidine derivative. ### Claim 19 A device, through which a gas sample can flow, for detecting chlorine dioxide, the device comprising: a reagent flow space; a reagent in said flow space, said flow space to expose the gas sample to be analyzed to said reagent for removing chlorine, said reagent consisting essentially of one or more of cyclohexylsulfamic acid, and a cyclohexylsulfamic acid salt; and an indicator or an electrochemical cell forming a chlorine dioxide qualitative and/or quantitative determination means for a qualitative and/or quantitative determination of chlorine dioxide downstream of said flow space. ### Claim 20 (depends on 19) A device in accordance with claim 19, wherein the reagent for removing chlorine is sodium N-cyclohexyl sulfamate and/or calcium N-cyclohexyl sulfamate.