DE746048C - Test tubes for the detection and measurement of acidic gases, especially carbonic acid - Google Patents

Test tubes for the detection and measurement of acidic gases, especially carbonic acid

Info

Publication number
DE746048C
DE746048C DEA97310D DEA0097310D DE746048C DE 746048 C DE746048 C DE 746048C DE A97310 D DEA97310 D DE A97310D DE A0097310 D DEA0097310 D DE A0097310D DE 746048 C DE746048 C DE 746048C
Authority
DE
Germany
Prior art keywords
carbonic acid
measurement
detection
acidic gases
test tubes
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
Application number
DEA97310D
Other languages
German (de)
Inventor
Dr Walter Meins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Auergesellschaft GmbH
Original Assignee
Auergesellschaft GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Auergesellschaft GmbH filed Critical Auergesellschaft GmbH
Priority to DEA97310D priority Critical patent/DE746048C/en
Application granted granted Critical
Publication of DE746048C publication Critical patent/DE746048C/en
Expired legal-status Critical Current

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

Prüfröhrchen zum Nachweis und zur Messung saurer Gase, insbesondere der Kohlensäure Zur angenäherten Bestimmung des Kohlensäuregehaltes der Luft, besonders in geschlossenen Räumen, verwendet man schon seit längerer Zeit evakuierte Glas ampullen blestimmten Volumens, die eine abgemessene Menge einer mit Phenolphthalein gefärbten Lauge enthaken. Zur Durchführung einer Messung wird die Ampulle geöffnet und zur beschleunigten Absorption der eingeströmten Luft under Umschütteln der Ampulle die zur Entfärbung der Reaktionslösung notwendige Zeit ermittelt oder aber die bleibende Färbung mit einer Standard-Vergleichsfarbe verglichen. Man kann auf diese Weise den Kohlensäuregehalt der Luft angenähert ermitteln.Detection tubes for the detection and measurement of acidic gases, in particular of carbonic acid For the approximate determination of the carbonic acid content of the air, especially In closed rooms, evacuated glass has been used for a long time vials of a certain volume containing a measured amount of phenolphthalein unhook the colored lye. The ampoule is opened to carry out a measurement and for accelerated absorption of the air flowing in while shaking the ampoule the time necessary to decolorize the reaction solution is determined or the remaining time Color compared with a standard comparison color. You can this way determine the approximate carbonic acid content of the air.

Es hat sich aber gezeigt, daß die bislang brenutzten Reaktionslösungen unter Verwendung von Phenolphthalein als Indikator nicht die erforderliche Lagerbestän digkeit besitzen. Es tritt im Laufe der Zeit selbst bei Verwendung hochwertiger Gläser für die Ampullen, eine Entfärbung der Lösung ein, so daß bei der Prüfung mit solchen Ampullen eine gewisse Unsicherheit vorhanden ist.However, it has been shown that the previously used reaction solutions using phenolphthalein as an indicator does not have the required inventory have dignity. It occurs over time even with high quality use Glasses for the ampoules, a discoloration of the solution, so that when testing there is some uncertainty with such ampoules.

Die vorliegende Erfindung betrifft die Verwendung eines beständigen Indikators an Stelle von Phenolphthalein mit Eigenschaften, die diesem weitgehend ähneln, besonders was die Färbung der Lösung und die Entfärbung bei der Reaktion betrifft. Dadurch soll gegenüber dem Bekannten eine gute Lagerbeständigkeit erreicht werden. The present invention relates to the use of a permanent Indicator in place of phenolphthalein with properties that largely resemble this are similar, especially with regard to the color of the solution and the discoloration during the reaction regards. This is intended to achieve a good shelf life compared to the known will.

Nach der Erfindung wird als ein solcher Indikator, der allen Anforderungen genügt, das lagerbeständige Tetrachlorphenolphtha-1ein benutzt, dessen Formel nachstehend an gegeben ist: So hat sich beispielsweise eine Barytlösung die mit Phenolphthalein angefärbt war, nach 4wöchigem Stehen nahezu vollständig entfärbt. während eine mit Tetrachlorphenolphthalein angesetzte Barytlösung unter gleichen Versuchsbedingungen sich nicht verändert hat.According to the invention, the storage-stable tetrachlorophenolphtha-1ein is used as such an indicator that meets all requirements, the formula of which is given below: For example, a barite solution that was colored with phenolphthalein was almost completely discolored after standing for 4 weeks. while a barite solution prepared with tetrachlorophenolphthalein has not changed under the same test conditions.

Die Verwendung des Tetrachlorphenolphtaleins bietet außerdem noch den Vorteil, daß zur Erzielung einer gleich intensiven Farbe erheblich geringere Mengen Indikatorstoff erforderlich sind als bein Phenolphthalein. The use of the tetrachlorophenolphthalein also offers the advantage that to achieve an equally intense color considerably less Quantities of indicator substance are required than for phenolphthalein.

Claims (1)

PATENTANSPRUCH: -Evakuiertes, mit einer Lauge und einem Indikator gefülltes Prüfröhrchen zum Nachweis und zur Messung von sauren Gasen, insbesondere der Kohlensäure in der Luft, gekennzeichnet durch die Venvendung von Tetrachl orphenolphthalein als Indikator. PATENT CLAIM: - Evacuated, with a lye and an indicator Filled test tube for the detection and measurement of acidic gases, in particular the carbonic acid in the air, characterized by the use of tetrachlorophenolphthalein as an indicator. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik sind im Erteilungsverfahren keine Druckschriften in Betracht gezogen worden. To distinguish the subject of the application from the state of the art are no publications were considered in the granting procedure.
DEA97310D 1943-01-29 1943-01-29 Test tubes for the detection and measurement of acidic gases, especially carbonic acid Expired DE746048C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA97310D DE746048C (en) 1943-01-29 1943-01-29 Test tubes for the detection and measurement of acidic gases, especially carbonic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA97310D DE746048C (en) 1943-01-29 1943-01-29 Test tubes for the detection and measurement of acidic gases, especially carbonic acid

Publications (1)

Publication Number Publication Date
DE746048C true DE746048C (en) 1944-10-16

Family

ID=6951446

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA97310D Expired DE746048C (en) 1943-01-29 1943-01-29 Test tubes for the detection and measurement of acidic gases, especially carbonic acid

Country Status (1)

Country Link
DE (1) DE746048C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1300711B (en) * 1964-08-18 1969-08-07 Mine Safety Appliances Co Test tube for the determination of hydrocyanic acid in gases

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1300711B (en) * 1964-08-18 1969-08-07 Mine Safety Appliances Co Test tube for the determination of hydrocyanic acid in gases

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