GB991420A - Improvements in or relating to apparatus for and processes of testing gas - Google Patents

Improvements in or relating to apparatus for and processes of testing gas

Info

Publication number
GB991420A
GB991420A GB4492961A GB4492961A GB991420A GB 991420 A GB991420 A GB 991420A GB 4492961 A GB4492961 A GB 4492961A GB 4492961 A GB4492961 A GB 4492961A GB 991420 A GB991420 A GB 991420A
Authority
GB
United Kingdom
Prior art keywords
benzidine
relating
processes
drager
dec
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
GB4492961A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB991420A publication Critical patent/GB991420A/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)

Abstract

991,420. Gas analysis. O. H. DRAGER, [trading as DRAGERWERK. HEINR. & BERNH. DRAGER]. Dec. 14, 1961 [Dec. 14, 1960], No. 44929/61. Heading G1B. Nitrogen oxides are detected in gases which also contain halogens and ozone, by contacting in sequence with benzidine or a derivative thereof, an oxidising agent to oxide to higher nitrogen oxides, and benzidine or a benzidine derivative which undergoes a colour change with nitrogen dioxide. A preliminary oxidising step can be added.
GB4492961A 1960-12-14 1961-12-14 Improvements in or relating to apparatus for and processes of testing gas Expired GB991420A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED34948A DE1127628B (en) 1960-12-14 1960-12-14 Procedure for the detection of nitrogen dioxide in gases and test tubes for the practice of this procedure

Publications (1)

Publication Number Publication Date
GB991420A true GB991420A (en) 1965-05-05

Family

ID=7042427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4492961A Expired GB991420A (en) 1960-12-14 1961-12-14 Improvements in or relating to apparatus for and processes of testing gas

Country Status (2)

Country Link
DE (1) DE1127628B (en)
GB (1) GB991420A (en)

Also Published As

Publication number Publication date
DE1127628B (en) 1962-04-12

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