• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2005843A
    申请号:NL2005843
    申请日:2010-12-09
    公开日:2011-10-04
    发明作者:Armin Schulten；Silke Guga
    申请人:Dräger Safety Ag & Co Kgaa；
    IPC主号:
    专利说明:

    Gas test tube for the determination of benzene
    The present invention relates to a gas test tube and a method for determining benzene.
    Gas analysis of benzene gas mixtures by means of gas test tubes has hitherto been colorimetrically based on p-quinoid compounds with paraformaldehyde / sulfuric acid or with iodine pentoxide.
    The determination with I2O5 provides a powerful, sharp indication that can be read with certainty by the user. However, the sensitivity of 2 ppm benzene and the selectivity towards, for example, gasoline hydrocarbons are insufficient.
    DE 865 384 B discloses a method for detecting benzene in gases which consists in reacting the gas to be tested with a mixture of paraformaldehyde and anhydrous sulfuric acid, preferably applied to silica gel. The sensitivity of the detection reaction can be increased by adding dimethyl sulfate. Detection on the basis of paraformaldehyde / sulfuric acid is sufficiently selective and sensitive in its use with a detection limit of approximately 0.5 ppm benzene. However, the reading accuracy is insufficient due to a diffuse discoloration, so that the user can only read the indicated concentration out of focus. Moreover, the measurement times with 20 minutes and 20 strokes are not user-friendly and such measurement times are not accepted in the container fumigation market. For release measurements in, for example, the market for gassing containers, the tubes mentioned cannot be used because of their poor sensitivity, reading accuracy, measuring time and selectivity. A qualitative measurement is required for this area of application, which determines whether or not a container is accessible.
    The problem to be solved by the invention is to provide an improving benzene detection reaction in gas analysis with a gas test tube and a corresponding method.
    The solution of this problem for the device appears from the features of claim 1.
    The method according to the invention is described by the features of claim 9.
    Advantageous use of a carrier material impregnated with gold (III) oxide is described in claim 11.
    Advantageous embodiments of the subject matter of the invention can be found in the subclaims.
    Gas analyzes with gas test tubes that have a reading layer based on gold (III) oxide give a sharp, easy-to-read selective black-violet indication from 5 ppm. Gasoline hydrocarbons such as, for example, 800 ppm of n-octane do not interfere with the detection of benzene, and aromatics such as toluene or xylene are retained as a preliminary layer in a benzene-permeable absorption layer and the user is shown qualitatively on this preliminary layer with a brown-violet discoloration.
    In addition to the benzene-permeable absorption layer, the gas test tube also has a drying layer which is arranged in front of the absorption layer.
    The drying layer consists in a known manner of silica gel impregnated with 100% sulfuric acid. The layer binds moisture in the air and protects the moisture-sensitive absorption and reading layer.
    The absorption layer consists of silica gel impregnated with 100% sulfuric acid and selenium dioxide. The layer oxidizes toluene and xylene so that they do not enter the reading layer and there can enter into a reaction with gold (III) oxide. The presence of toluene and xylene is qualitatively demonstrated in this layer by a brown-violet discoloration. The absorption layer is already used in known gas test tubes with a different detection reaction.
    The reading layer consists of quartz glass grit that is impregnated with 100% sulfuric acid and gold (III) oxide. The gold (III) oxide dissolved in sulfuric acid reacts with benzene to form colloidal gold and is selectively detected with a black-violet discoloration. Due to the high price of gold oxide and the particularly costly preparation of the support by cleaning with the aid of royal water, the reading layer is filled only over such a length, about 13 mm, that only a concentration of, for example, 1 ppm at 6 strokes with a stroke volume of 100 ml can be detected after 4 minutes. Concentrations such as, for example, 0.5 and 2 ppm are accordingly demonstrated with 12 strokes and 3 strokes.
    Because the required amount of reading layer is limited by the short filling method, the tube can be manufactured inexpensively despite the high manufacturing costs of the detection composition. Alternative materials for the carrier material are silica gel and silica gel in addition to quartz glass grit.
    Advantageously, with an internal diameter of the glass flask between 1 mm and 3 mm, the reading layer has a length between 10 mm and 15 mm. The length of the reading layer is such that at a benzene concentration of 0.5 ppm a color change takes place in the reading layer with a sample gas volume of approximately 1.2 liters.
    The method according to the invention for detecting benzene in a gas sample is characterized in that the gas sample is reacted with a carrier material impregnated with gold (III) oxide. Gold (III) oxide dissolved in sulfuric acid is used for the impregnation.
    An advantageous use of the carrier material impregnated with gold (III) oxide in the reading layer of a gas test tube consists of the detection of benzene.
    An embodiment of the gas test tube according to the invention is shown in the figure and further explained below.
    The only figure schematically shows the gas test tube for detecting benzene that in the gas flow direction indicated by an arrow comprises a drying layer 1, an absorption layer 2 and a reading layer 3 impregnated with gold (III) oxide. The absorption layers 1, 2, 4 are held in the glass body by a ceramic retaining element 4 and by a wire cap 5.
    List of reference marks 1 drying layer 2 absorption layer 3 reading layer 4 ceramic retaining element 5 wire cap
    权利要求:
    Claims (11)
    [1]
    A gas test tube for detecting benzene with a reading layer (3) consisting of a carrier material impregnated with gold (III) oxide.
    [2]
    Gas test tube according to claim 1, characterized in that the carrier material consists of quartz glass, silica gel or silica gel and that the impregnation is gold (III) oxide dissolved in sulfuric acid.
    [3]
    Gas test tube according to claim 1 or 2, characterized in that an absorption layer (2) for oxidizing toluene or xylene is provided for the reading layer (3).
    [4]
    Gas test tube according to claim 3, characterized in that the absorption layer (2) consists of a carrier material impregnated with sulfuric acid and selenium dioxide.
    [5]
    Gas test tube according to claim 3 or 4, characterized in that a drying layer (1) is provided for the absorption layer (2).
    [6]
    Gas test tube according to claim 5, characterized in that the drying layer (1) consists of a carrier material impregnated with sulfuric acid.
    [7]
    Gas test tube according to one of claims 1 to 6, characterized in that the reading layer (3) has a length between 10 mm and 15 mm at an internal diameter of between 1 mm and 3 mm.
    [8]
    Gas test tube according to one of claims 1 to 7, characterized in that the length of the reading layer (3) is such that with a benzene concentration of 0.5 ppm a color change in the reading layer (3) with a sample gas volume of 1, 2 1 has place.
    [9]
    9. A method for detecting benzene in a gas sample, characterized in that the gas sample is reacted with a carrier material impregnated with gold (III) oxide.
    [10]
    The method according to claim 9, characterized in that gold (III) oxide dissolved in sulfuric acid is used as impregnation.
    [11]
    11. Use of a carrier material impregnated with gold (III) oxide for the detection of benzene.
    类似技术:
    公开号 | 公开日 | 专利标题
    Jia et al.2018|A wavelength-modulated localized surface plasmon resonance | optical fiber sensor for sensitive detection of mercury | ion by gold nanoparticles-DNA conjugates
    FI76432B|1988-06-30|FARING REQUIREMENTS FOR THE CONSTITUTION OF THE ELEMENT I LOESNING MED EN LJUSLEDARE.
    EP2085769A1|2009-08-05|Formaldehyde detecting material, formaldehyde detector, formaldehyde detecting method and formaldehyde detecting reagent
    GB2064115A|1981-06-10|Determination of contaminant in air
    JP2014507668A|2014-03-27|Rapid quantification of biomolecules and methods in selectively functionalized nanofluidic biosensors
    KR101483725B1|2015-01-16|Method and Apparatus for Detecting a Specific Molecule Using Surface-Enhanced Raman Spectroscopy
    NL2005843C2|2011-10-11|HOST TEST FOR DETERMINING BENZENE.
    Preechakasedkit et al.2018|Gold nanoparticle core–europium | chelate fluorophore-doped silica shell hybrid nanocomposites for the lateral flow immunoassay of human thyroid stimulating hormone with a dual signal readout
    US20110052447A1|2011-03-03|Detection System for Detecting and Measuring Metal Ions in an Aqueous Medium
    JP4406702B2|2010-02-03|Formaldehyde detection method and detection apparatus
    JP2005257388A|2005-09-22|Method and apparatus for measuring concentration of aromatic hydrocarbons
    US3397966A|1968-08-20|Ozone determination
    CN101393202A|2009-03-25|Evanescent wave optical fiber biosensor and use thereof
    Kari et al.2021|Application of bromocresol purple nanofilm and laser light to detect mutton freshness
    US4460544A|1984-07-17|Test tube for the measurement of oil mists
    JP3889989B2|2007-03-07|Method and apparatus for measuring formaldehyde concentration in gas
    JPH067128B2|1994-01-26|Colorimetric gas diffusion test tube
    US20120149122A1|2012-06-14|Device and method for determining the concentration of a compound in an aqueous or gaseous phase
    CN104406947B|2018-02-06|By the use of Quercetin as fluorescence probe in measure F‑In application and its assay method
    Pugen et al.2011|Determination of Nitrogen Oxides with Rhodamine B by Fluorescence Quenching Method
    FI76216C|1988-09-09|Determination procedure for antigen
    Pannek et al.2015|Colorimetric materials for gas selective sensing in low-power applications
    US10656079B2|2020-05-19|UV solid state detection and methods therefor
    RU2556294C1|2015-07-10|Method of determining concentration of acrolein in air by method of high performance liquid chromatography
    Tsionsky et al.1993|Novel approach to the development of alkalinity and acidity detectors
    同族专利:
    公开号 | 公开日
    US20110236987A1|2011-09-29|
    NL2005843C2|2011-10-11|
    DE102010012468B4|2012-02-02|
    AU2011201320B2|2012-04-12|
    AU2011201320A1|2011-10-13|
    DE102010012468A1|2011-09-29|
    US8367421B2|2013-02-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE865384C|1951-05-22|1953-02-02|Draegerwerk Ag|Method for the detection of benzene in gases|
    DE1009827B|1955-09-01|1957-06-06|Auergesellschaft Ag|Method for the detection of benzene vapor in gases, especially in the air we breathe|
    DE1012480B|1955-09-01|1957-07-18|Auergesellschaft Ag|Test tube for the quantitative detection of benzene vapor, especially in the breath|
    DE1698176B1|1968-02-16|1972-05-31|Auergesellschaft Gmbh|TEST TUBE FOR EVALUATING THE ATMOSPHERES IN SEWAGE CHANNELS|WO2016081245A1|2014-11-19|2016-05-26|Honeywell International Inc.|Benzene sensors using metal oxides and associated methods|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102010012468A|DE102010012468B4|2010-03-24|2010-03-24|Gas test tube for the determination of benzene|
    DE102010012468|2010-03-24|
    [返回顶部]