DE865384C - Method for the detection of benzene in gases - Google Patents
Method for the detection of benzene in gasesInfo
- Publication number
- DE865384C DE865384C DED9201A DED0009201A DE865384C DE 865384 C DE865384 C DE 865384C DE D9201 A DED9201 A DE D9201A DE D0009201 A DED0009201 A DE D0009201A DE 865384 C DE865384 C DE 865384C
- Authority
- DE
- Germany
- Prior art keywords
- benzene
- mixture
- gases
- detection
- reagent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Biophysics (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)
Description
Verfahren zum Nachweis von Benzol in Gasen Es ist bekannt, Benzol in flüssigem oder gasfärm-igem Zustand mit Hilfe eines Reagenis nachzuweisen, das aus einemGemischvonkonzentrierter Schwefelsäure und Formaldehyd besteht. Zum Nachweis kann das Gas durch eine Waschflasche geleitet werden, die das Gemisch enthält. Das Reagens hat den Nachteil der Unbeständigkeit. Demzufolge hat sich auch die Anwendung dieses Reagens bei den sog. Gasprüfnöhrchen, bei denen das Reagens auf einen festen. Träger, wie beispielsweise Kieselgel, aufgetragen wird, nicht bewährt.Method for the detection of benzene in gases It is known that benzene in a liquid or gaseous state with the help of a reagent that consists of a mixture of concentrated sulfuric acid and formaldehyde. As proof the gas can be passed through a wash bottle containing the mixture. That Reagent has the disadvantage of inconsistency. As a result, the application has also changed this reagent in the so-called gas test tubes, in which the reagent on a solid. Carrier, such as silica gel, is applied, not proven.
Die Erfindung erstrebt ein haltbares Reagens zum Nachweis von Benzol in Gasen und besteht darin, daß das zu untersuchende Gas mit einem vorzugsweise auf Kieselgel aufgetragenen Gemisch von P'araformaldehyd und wasserfreier Schwefelsäure in Reaktion gebracht wird. Als Paraformaldehyd wird dabei das feste, wasserfreie Trimere des Formaldehyds bezeichnet. Eine derartige Reagenslösung ist auf Kieselgel imprägniert und insbesondere unter Lichtabschluß praktisch unbegrenzt haltbar.The invention seeks a durable reagent for the detection of benzene in gases and consists in that the gas to be examined with a preferably A mixture of paraformaldehyde and anhydrous sulfuric acid applied to silica gel is brought into reaction. Paraformaldehyde is the solid, anhydrous Called trimers of formaldehyde. One such reagent solution is on silica gel impregnated and can be kept practically indefinitely, especially if it is closed off from light.
Vorzugsweise kann dabei das Gemisch einen Zusatz vom Dimethylsulfat erhalten. Ein. derartiges Reagens zeigt in sehr hoher Empfindlichkeit Benzol und seine Homologen an, wobei die Reaktion praktisch völlig spezifisch ist. Die leicht siedenden Benzinkohlenwasserstoffe, wie z. B. Petroleumbernzin; geben mit dem Gemisch keine Reaktion. Durch den Dimethylsulfatzusatzwird die Spezifiltät erhöht. An Sitelle des Dimebhylsulfates kann dem Gemisch auch Methanol zugesetzt werden, das sich mit dem Schwefelsäuremonohydrat unter Bildung von; Dimethylsulfat umsetzb. Das Dimethylsu,lfat enthaltende Gemisch kann in gleicher Weise auf Kieselgel aufgetragen werden und ist praktisch unbegrenzt haltbar und nicht lichtempfindlich.The mixture can preferably contain an addition of dimethyl sulfate obtain. A. such reagent shows benzene and benzene with very high sensitivity its homologues, the reaction being practically completely specific. The easy boiling petrol hydrocarbons, such as. B. Petroleum Amber; give no reaction with the mixture. The specificity is enhanced by the addition of dimethyl sulfate elevated. Methanol can also be added to the mixture in place of the dimethyl sulfate become, which is with the sulfuric acid monohydrate with the formation of; Dimethyl sulfate implementable The mixture containing dimethyl sulfate can be applied to silica gel in the same way can be applied and has a practically unlimited shelf life and is not sensitive to light.
Ausführungsbeispiel wo g scharf getrocknetes mittelporiges Kieselgel in der Körnung von o;5 bis i mm werdlen, mit einer Reagen.sl?ösung folgender Zusammensetzung imprägniert: 5o ccm Schwefelsäuremonohydrat p. A., 0,5; g Paraformaldehyd wasserfrei, ilo ccm Dimethylsulfat@ p. A.Embodiment where g sharply dried medium-pored silica gel in the grain size from 0.5 to 1 mm, with a reagent solution of the following composition impregnated: 5o ccm sulfuric acid monohydrate p. A., 0.5; g paraformaldehyde anhydrous, ilo ccm dimethyl sulfate @ p. A.
Nach vollständiger Homogenisierung, des Präparates wird es in io cm lange Glasröhrchen, die einen Durchmesser von etwa .ä mm haben, eingefüllt. Die Glasröhrchen werden beidseitig abgeschmolzen. Zur Prüfung w.erd"ndi,e al)geschinolzenen Spitzen des R,-#hrchens geöffnet und durch das Riöhrchen mittels einer Saugvorrichtung das zu untersuchende Gasgemisch gepumpt. Ensprechend der vorhandenen Benzolkonzentration im. untersuchten Gasgemisch und entsprechend dein Saugvolumen entsteht nun eine mehr oder weniger intensive Rosafärbung, die sich mitHilfevonVergleichsfärbungen kolorimetrisch auswerten läßt.After complete homogenization, the preparation is measured in 10 cm long glass tubes with a diameter of about .ä mm are filled. the Glass tubes are melted on both sides. To test w.erd "ndi, e al) geschinolzenen Open the tips of the tube and pass it through the tube by means of a suction device the gas mixture to be examined is pumped. According to the existing benzene concentration in the. examined gas mixture and according to your suction volume now a more or less intense pink coloring, which can be achieved with the help of comparative coloring can be colorimetrically evaluated.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED9201A DE865384C (en) | 1951-05-22 | 1951-05-22 | Method for the detection of benzene in gases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED9201A DE865384C (en) | 1951-05-22 | 1951-05-22 | Method for the detection of benzene in gases |
Publications (1)
Publication Number | Publication Date |
---|---|
DE865384C true DE865384C (en) | 1953-02-02 |
Family
ID=7032781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED9201A Expired DE865384C (en) | 1951-05-22 | 1951-05-22 | Method for the detection of benzene in gases |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE865384C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1037178B (en) * | 1956-12-14 | 1958-08-21 | Draegerwerk Ag | Pruefroehrchen for the detection of toluene and its homologues |
DE102010012468A1 (en) | 2010-03-24 | 2011-09-29 | Dräger Safety AG & Co. KGaA | Gas test tube for the determination of benzene |
-
1951
- 1951-05-22 DE DED9201A patent/DE865384C/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1037178B (en) * | 1956-12-14 | 1958-08-21 | Draegerwerk Ag | Pruefroehrchen for the detection of toluene and its homologues |
DE102010012468A1 (en) | 2010-03-24 | 2011-09-29 | Dräger Safety AG & Co. KGaA | Gas test tube for the determination of benzene |
US8367421B2 (en) | 2010-03-24 | 2013-02-05 | Dräger Safety AG & Co. KGaA | Gas detector tube for determining benzene |
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