DE10254841A1 - Sensor for measuring carbon dioxide levels in gases or liquids comprises a basic acceptor which is a polybasic inorganic anion or an organic anion - Google Patents
Sensor for measuring carbon dioxide levels in gases or liquids comprises a basic acceptor which is a polybasic inorganic anion or an organic anion Download PDFInfo
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- DE10254841A1 DE10254841A1 DE2002154841 DE10254841A DE10254841A1 DE 10254841 A1 DE10254841 A1 DE 10254841A1 DE 2002154841 DE2002154841 DE 2002154841 DE 10254841 A DE10254841 A DE 10254841A DE 10254841 A1 DE10254841 A1 DE 10254841A1
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- acid
- sensor according
- sensor
- anions
- carbon dioxide
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 15
- 150000001449 anionic compounds Chemical class 0.000 title claims abstract description 4
- 229910001412 inorganic anion Inorganic materials 0.000 title claims abstract description 4
- 239000007788 liquid Substances 0.000 title claims abstract description 4
- 150000002891 organic anions Chemical class 0.000 title claims abstract 6
- 239000007789 gas Substances 0.000 title abstract description 4
- WWZKQHOCKIZLMA-UHFFFAOYSA-N Caprylic acid Natural products CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 claims description 6
- 150000001735 carboxylic acids Chemical class 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 125000001931 aliphatic group Chemical group 0.000 claims description 5
- 150000001450 anions Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- GHVNFZFCNZKVNT-UHFFFAOYSA-N Decanoic acid Natural products CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 claims description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 4
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 claims description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 4
- TXXHDPDFNKHHGW-UHFFFAOYSA-N muconic acid Chemical compound OC(=O)C=CC=CC(O)=O TXXHDPDFNKHHGW-UHFFFAOYSA-N 0.000 claims description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 4
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 4
- UJMDYLWCYJJYMO-UHFFFAOYSA-N benzene-1,2,3-tricarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1C(O)=O UJMDYLWCYJJYMO-UHFFFAOYSA-N 0.000 claims description 3
- 150000001991 dicarboxylic acids Chemical class 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- WBYWAXJHAXSJNI-VOTSOKGWSA-M .beta-Phenylacrylic acid Natural products [O-]C(=O)\C=C\C1=CC=CC=C1 WBYWAXJHAXSJNI-VOTSOKGWSA-M 0.000 claims description 2
- GYSCBCSGKXNZRH-UHFFFAOYSA-N 1-benzothiophene-2-carboxamide Chemical compound C1=CC=C2SC(C(=O)N)=CC2=C1 GYSCBCSGKXNZRH-UHFFFAOYSA-N 0.000 claims description 2
- 239000005711 Benzoic acid Substances 0.000 claims description 2
- WBYWAXJHAXSJNI-SREVYHEPSA-N Cinnamic acid Chemical compound OC(=O)\C=C/C1=CC=CC=C1 WBYWAXJHAXSJNI-SREVYHEPSA-N 0.000 claims description 2
- 239000001856 Ethyl cellulose Substances 0.000 claims description 2
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 2
- TXXHDPDFNKHHGW-CCAGOZQPSA-N Muconic acid Natural products OC(=O)\C=C/C=C\C(O)=O TXXHDPDFNKHHGW-CCAGOZQPSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 claims description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 2
- OBETXYAYXDNJHR-UHFFFAOYSA-N alpha-ethylcaproic acid Natural products CCCCC(CC)C(O)=O OBETXYAYXDNJHR-UHFFFAOYSA-N 0.000 claims description 2
- UKXSKSHDVLQNKG-UHFFFAOYSA-N benzilic acid Chemical compound C=1C=CC=CC=1C(O)(C(=O)O)C1=CC=CC=C1 UKXSKSHDVLQNKG-UHFFFAOYSA-N 0.000 claims description 2
- 235000010233 benzoic acid Nutrition 0.000 claims description 2
- GONOPSZTUGRENK-UHFFFAOYSA-N benzyl(trichloro)silane Chemical compound Cl[Si](Cl)(Cl)CC1=CC=CC=C1 GONOPSZTUGRENK-UHFFFAOYSA-N 0.000 claims description 2
- 229930016911 cinnamic acid Natural products 0.000 claims description 2
- 235000013985 cinnamic acid Nutrition 0.000 claims description 2
- 229920001249 ethyl cellulose Polymers 0.000 claims description 2
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 claims description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 2
- 239000011976 maleic acid Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- WBYWAXJHAXSJNI-UHFFFAOYSA-N methyl p-hydroxycinnamate Natural products OC(=O)C=CC1=CC=CC=C1 WBYWAXJHAXSJNI-UHFFFAOYSA-N 0.000 claims description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N n-hexanoic acid Natural products CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229960004889 salicylic acid Drugs 0.000 claims description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 2
- 239000000370 acceptor Substances 0.000 claims 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims 2
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 claims 2
- WLJVXDMOQOGPHL-PPJXEINESA-N 2-phenylacetic acid Chemical compound O[14C](=O)CC1=CC=CC=C1 WLJVXDMOQOGPHL-PPJXEINESA-N 0.000 claims 1
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 claims 1
- 235000021314 Palmitic acid Nutrition 0.000 claims 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims 1
- -1 aromatic carboxylic acids Chemical class 0.000 claims 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims 1
- 150000005622 tetraalkylammonium hydroxides Chemical class 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical class [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 150000001768 cations Chemical group 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-M phenolate Chemical compound [O-]C1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-M 0.000 description 2
- 229940031826 phenolate Drugs 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- RTSJOGUYDDKAQI-UHFFFAOYSA-N C(CCCCCCCCC)(=O)O.C(CCCCCCCCC(=O)O)(=O)O Chemical compound C(CCCCCCCCC)(=O)O.C(CCCCCCCCC(=O)O)(=O)O RTSJOGUYDDKAQI-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229920012485 Plasticized Polyvinyl chloride Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229940087675 benzilic acid Drugs 0.000 description 1
- OVYQSRKFHNKIBM-UHFFFAOYSA-N butanedioic acid Chemical compound OC(=O)CCC(O)=O.OC(=O)CCC(O)=O OVYQSRKFHNKIBM-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- AHAREKHAZNPPMI-UHFFFAOYSA-N hexa-1,3-diene Chemical compound CCC=CC=C AHAREKHAZNPPMI-UHFFFAOYSA-N 0.000 description 1
- KYYWBEYKBLQSFW-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O.CCCCCCCCCCCCCCCC(O)=O KYYWBEYKBLQSFW-UHFFFAOYSA-N 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000011872 intimate mixture Substances 0.000 description 1
- TWHMVKPVFOOAMY-UHFFFAOYSA-N octanedioic acid Chemical compound OC(=O)CCCCCCC(O)=O.OC(=O)CCCCCCC(O)=O TWHMVKPVFOOAMY-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- NHGXDBSUJJNIRV-UHFFFAOYSA-M tetrabutylammonium chloride Chemical group [Cl-].CCCC[N+](CCCC)(CCCC)CCCC NHGXDBSUJJNIRV-UHFFFAOYSA-M 0.000 description 1
- CHYBTAZWINMGHA-UHFFFAOYSA-N tetraoctylazanium Chemical compound CCCCCCCC[N+](CCCCCCCC)(CCCCCCCC)CCCCCCCC CHYBTAZWINMGHA-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
Die Erfindung betrifft einen Kohlendioxidsensor nach dem Oberbegriff des Anspruchs 1.The invention relates to a carbon dioxide sensor according to the preamble of claim 1.
Stand der TechnikState of technology
Kohlendioxidsensoren (CO2-Sensoren) sind allgemein bekannt. Die meisten CO2-Sensoren nutzen die Säurewirkung von CO2 aus. In der Regel wird dem Sensormaterial eine starke Base zugesetzt, um die Empfindlichkeit des Sensors zu verbessern. Als Basen werden hauptsächlich Tetraalkylammoniumhydroxide verwendet. Diese Basen reagieren mit CO2 zu Hydrogencarbonaten. Das Säure-Base-Gleichgewicht zwischen Hydroxid und Hydrogencarbonat ist CO2-konzentrationsabhängig und kann durch pH-Farbstoffe oder potentiometrisch ausgelesen werden.Carbon dioxide (CO 2 ) sensors are generally known. Most CO 2 sensors take advantage of the acid effects of CO 2 . A strong base is usually added to the sensor material to improve the sensitivity of the sensor. Mainly tetraalkylammonium hydroxides are used as bases. These bases react with CO 2 to form hydrogen carbonates. The acid-base equilibrium between hydroxide and hydrogen carbonate is dependent on the CO 2 concentration and can be read out using pH dyes or potentiometrically.
So ist bspw. aus der WO 91/05252 ein Kohlendioxid-Monitor bekannt, der ein Substrat umfasst, auf dem sich ein Anzeigelement befindet, das ein inniges Gemisch aus einem transparenten Polymervehikel und einem Indikatormaterial umfasst, das bei Kohlendioxid-Exposition eine Farbänderung erfährt. Das Anzeigeelement liegt in Form eines Films vor, wobei das Indikatormaterial ein Salz eines Indikatoranions und eines lipophilen organischen quaternären Kations, bspw. Tetrabutyl- oder Tetraoctylammonium ist.For example, from WO 91/05252 known a carbon dioxide monitor comprising a substrate which is a display element that is an intimate mixture a transparent polymer vehicle and an indicator material, that with carbon dioxide exposure a color change experiences. The Display element is in the form of a film, the indicator material a salt of an indicator anion and a lipophilic organic quaternary Cations, for example. Tetrabutyl or tetraoctyl ammonium.
Die WO 93/14399 offenbart einen Kohlendioxid-Detektor, der ein Kohlendioxid-Sensormedium enthält, das einen anionischen fluorimetrischen Farbstoff und ein lipophiles quaternäres Kation umfasst.WO 93/14399 discloses a carbon dioxide detector, that contains a carbon dioxide sensor medium that an anionic fluorometric dye and a lipophilic quaternary Cation includes.
Schließlich beschreibt die US-Patentschrift 6,338,822 einen Sensor für die optische Bestimmung durch Fluoreszenz von Kohlendioxid in flüssigen und gasförmigen Medien, der im Wesentlichen aus einem Träger und einer darauf aufgebrachten lichtempfindlichen Schicht besteht. Zusätzlich zu einem Polymer als Basissubstanz und einem anionischen Fluoreszenz-Farbstoff enthält die lichtempfindliche Schicht auch ein quartäres Onium-Phenolat.Finally, US Pat. No. 6,338,822 describes a sensor for optical determination by fluorescence of carbon dioxide in liquid and gaseous media, which essentially consists of a carrier and a photosensitive layer applied thereon. additionally to a polymer as the base substance and an anionic fluorescent dye contains the photosensitive Layer also a quaternary Onium phenolate.
Aufgrund der starken Basizität des Tetraalkylammoniumhydroxids werden auch NO2 und SO2 absorbiert, die unter Oxidation zu Nitrat und Sulfat eine irreversible Ansäuerung hervorrufen. Aufgrund der Irreversibilität reagiert der Sensor nicht mehr auf eine Verringerung der Konzentration an sauren Gasen. Durch die starke Basizität von Tetraalkylammoniumhydroxid (vergleichbar etwa mit NaOH) ist die Verfügbarkeit von Sensormaterialien wie Polymeren, Weichmacher, etc. beschränkt. Weichgemachtes PVC als typisches Beispiel für eine polymere Matrix kann z.B. nicht eingesetzt werden, da es zu Eliminierung von HCl kommt. Des weiteren ist die thermische Stabilität der Ammoniumhydroxide nicht ausreichend. Durch einfaches Erhitzen zersetzen sich die Tetraalkylammoniumhydroxide in Olefin, Amin und Wasser (Hofmann-Abbau).Due to the strong basicity of the tetraalkylammonium hydroxide, NO 2 and SO 2 are also absorbed, which cause an irreversible acidification when oxidized to nitrate and sulfate. Due to the irreversibility, the sensor no longer responds to a decrease in the concentration of acid gases. The strong basicity of tetraalkylammonium hydroxide (comparable to NaOH, for example) limits the availability of sensor materials such as polymers, plasticizers, etc. Plasticized PVC as a typical example of a polymer matrix cannot be used, for example, because it eliminates HCl. Furthermore, the thermal stability of the ammonium hydroxides is not sufficient. The tetraalkylammonium hydroxides decompose into olefin, amine and water by simple heating (Hofmann degradation).
Vorteile der ErfindungAdvantages of invention
Der erfindungsgemäße Kohledioxidsensor hat gegenüber dem Stand der Technik den Vorteil, dass er eine höhere thermische Stabilität und eine geringere Basizität aufweist.The carbon dioxide sensor according to the invention has Prior art has the advantage that it has a higher thermal stability and a lower basicity having.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den in den Unteransprüchen genannten Maßnahmen.Advantageous further developments of Invention result from the measures mentioned in the subclaims.
Ausführungsbeispieleembodiments
Die vorliegende Erfindung stellt einen Kohlendioxidsensor zur Verfügung, der gegenüber Sensoren mit Ammoniumhydroxiden eine höhere thermische Stabilität und eine geringere Basizität aufweist. Die irreversible Ansäuerung wird dadurch verringert, da saure Gase wie NO2 und SO2 nicht mehr in dem Umfang wie bei Hydroxiden absorbiert werden. Da CO2 in höheren Konzentrationen als NO2 und SO2 natürlich vorkommt, wird dieses weiterhin detektiert.The present invention provides a carbon dioxide sensor which has a higher thermal stability and a lower basicity than sensors with ammonium hydroxides. The irreversible acidification is reduced because acid gases such as NO 2 and SO 2 are no longer absorbed to the same extent as with hydroxides. Since CO 2 occurs naturally in higher concentrations than NO 2 and SO 2 , this is still detected.
Kern der Erfindung ist ein basischer Akzeptor für CO2 , der ein doppelt gebundenes Sauerstoffatom, also keinen hydroxidisch oder phenolatisch gebundenen Sauerstoff enthält. Der Akzeptor steht im Gleichgewicht zum CO2-Gehalt der Umgebung. Er zeichnet sich außer durch ein höhere thermische Stabilität auch durch eine geringere Temperaturabhängigkeit des Sensorsignals und eine verbesserten Selektivität gegenüber SO2 und NO2 aus, was bedeutet, dass die Basizität auf das Detektionsereignis abgestimmt werden kann.The essence of the invention is a basic acceptor for CO 2 , which contains a double bonded oxygen atom, that is to say no oxygen bound by a hydroxide or phenolate. The acceptor is in equilibrium with the CO 2 content in the environment. In addition to its higher thermal stability, it is also characterized by a lower temperature dependence of the sensor signal and an improved selectivity towards SO 2 and NO 2 , which means that the basicity can be matched to the detection event.
Anstelle des Tetraalkylammoniumhydroxids bzw.
anderer lipophiler Ammoniumsalze können beispielsweise folgende
Substanzen verwendet werden:
Anorganische Anionen:
Phosphat
PO4
3–, Hydrogenphosphat HPO4
2–, Hydrogensulfat HSO4
–
Organische Anionen:
– Carbonsäureanionen
der folgenden Carbonsäuren (aliphatisch,
gesättigt):
– Phenylessigsäure, Hexansäure, Octansäure, Decansäure, Dodecansäure, Hexadecansäure (Palmitinsäure), Benzilsäure
– Dianionen
der folgenden Dicarbonsäuren
(aliphatisch, gesättigt):
Butandisäure
(Bernsteinsäure), Octandisäure (Korksäure), Decandisäure (Caprinsäure), Dodecandisäure
– Dianionen
der folgenden Carbondisäuren
(aliphatisch, ungesättigt):
Butendisäure
(Maleinsäure),
Hexadiendisäure
(Muconsäure)
– Carbonsäureanionen
der folgenden Carbonsäuren (aromatisch):
Benzoesäure,
Salicylsäure,
Dibutylhydroxybenzoesäure,
Phthalsäure,
Terephthalsäure, Zimtsäure, BenzoltricarbonsäureInstead of the tetraalkylammonium hydroxide or other lipophilic ammonium salts, the following substances can be used, for example:
Inorganic anions:
Phosphate PO 4 3– , hydrogen phosphate HPO 4 2– , hydrogen sulfate HSO 4 -
Organic anions:
- Carboxylic acid anions of the following carboxylic acids (aliphatic, saturated):
- phenylacetic acid, hexanoic acid, octanoic acid, decanoic acid, dodecanoic acid, hexadecanoic acid (palmitic acid), benzilic acid
- Dianions of the following dicarboxylic acids (aliphatic, saturated): butanedioic acid (succinic acid), octanedioic acid (suberic acid), decanedioic acid (capric acid), dodecanedioic acid
- Dianions of the following carboxylic diacids (aliphatic, unsaturated): butenedioic acid (maleic acid), hexadiene diacid (muconic acid)
- Carboxylic acid anions of the following carboxylic acids (aromatic): benzoic acid, salicylic acid, dibutylhydroxybenzoic acid, phthalic acid, terephthalic acid, cinnamic acid, benzene tricarboxylic acid
Die vorgeschlagenen Verbindungen können in optischen und potentiometrischen Sensoren eingesetzt werden. Außerdem können sie ohne und mit verschiedenen Matrices wie z.B. Ethylcellulose oder Sol/Gelschichten eingebettet werden.The proposed connections can in optical and potentiometric sensors are used. Besides, they can without and with different matrices such as Ethyl cellulose or sol / gel layers be embedded.
Claims (12)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002154841 DE10254841A1 (en) | 2002-11-25 | 2002-11-25 | Sensor for measuring carbon dioxide levels in gases or liquids comprises a basic acceptor which is a polybasic inorganic anion or an organic anion |
| CH16582003A CH696675A5 (en) | 2002-11-25 | 2003-09-30 | Carbon dioxide sensor. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002154841 DE10254841A1 (en) | 2002-11-25 | 2002-11-25 | Sensor for measuring carbon dioxide levels in gases or liquids comprises a basic acceptor which is a polybasic inorganic anion or an organic anion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10254841A1 true DE10254841A1 (en) | 2004-06-03 |
Family
ID=32240367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2002154841 Withdrawn DE10254841A1 (en) | 2002-11-25 | 2002-11-25 | Sensor for measuring carbon dioxide levels in gases or liquids comprises a basic acceptor which is a polybasic inorganic anion or an organic anion |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH696675A5 (en) |
| DE (1) | DE10254841A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011006677A1 (en) | 2009-07-13 | 2011-01-20 | Hochschule Lausitz | Multi-electrode chemiresistor |
-
2002
- 2002-11-25 DE DE2002154841 patent/DE10254841A1/en not_active Withdrawn
-
2003
- 2003-09-30 CH CH16582003A patent/CH696675A5/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011006677A1 (en) | 2009-07-13 | 2011-01-20 | Hochschule Lausitz | Multi-electrode chemiresistor |
Also Published As
| Publication number | Publication date |
|---|---|
| CH696675A5 (en) | 2007-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20110601 Effective date: 20110531 |