FR2358652A1 - Monitoring properties esp. pH of aq. solns. - using photodetector measuring monochromatic light transmission rate through the soln. - Google Patents

Monitoring properties esp. pH of aq. solns. - using photodetector measuring monochromatic light transmission rate through the soln.

Info

Publication number
FR2358652A1
FR2358652A1 FR7721320A FR7721320A FR2358652A1 FR 2358652 A1 FR2358652 A1 FR 2358652A1 FR 7721320 A FR7721320 A FR 7721320A FR 7721320 A FR7721320 A FR 7721320A FR 2358652 A1 FR2358652 A1 FR 2358652A1
Authority
FR
France
Prior art keywords
soln
solns
esp
transmission rate
light transmission
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.)
Withdrawn
Application number
FR7721320A
Other languages
French (fr)
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.)
BHN Inc
Original Assignee
BHN Inc
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 BHN Inc filed Critical BHN Inc
Publication of FR2358652A1 publication Critical patent/FR2358652A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Properties of an aqueous soln. such as its pH value are determined by passing the monochromatic beam of a light source through it, pref. after a pH-sensitive indicator has been added to it. The proportion of the light transmitted is measured and converted into an electrical signal. Its amplitude is indicative of the desired property. This replaces the subjective (visual) determination of a colour change, when pH-papers or indicators are used, by an objective system. The new system is less expensive and easier to handle than electronic pH meters. The pH-value can be determined with an accuracy of 1/10 in a range from 1-14.
FR7721320A 1976-07-14 1977-07-11 Monitoring properties esp. pH of aq. solns. - using photodetector measuring monochromatic light transmission rate through the soln. Withdrawn FR2358652A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70520276A 1976-07-14 1976-07-14

Publications (1)

Publication Number Publication Date
FR2358652A1 true FR2358652A1 (en) 1978-02-10

Family

ID=24832477

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7721320A Withdrawn FR2358652A1 (en) 1976-07-14 1977-07-11 Monitoring properties esp. pH of aq. solns. - using photodetector measuring monochromatic light transmission rate through the soln.

Country Status (4)

Country Link
JP (1) JPS5311090A (en)
BR (1) BR7704534A (en)
DE (1) DE2729684A1 (en)
FR (1) FR2358652A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56112664U (en) * 1980-01-31 1981-08-31
US4498782A (en) * 1981-05-29 1985-02-12 Science Research Center, Inc. Assembly for determining light transmissiveness of a fluid

Also Published As

Publication number Publication date
BR7704534A (en) 1978-04-04
JPS5311090A (en) 1978-02-01
DE2729684A1 (en) 1978-03-30

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Legal Events

Date Code Title Description
ST Notification of lapse