GB1320966A - Method of and apparatus for determining colourimetric concentrations - Google Patents

Method of and apparatus for determining colourimetric concentrations

Info

Publication number
GB1320966A
GB1320966A GB5174270A GB5174270A GB1320966A GB 1320966 A GB1320966 A GB 1320966A GB 5174270 A GB5174270 A GB 5174270A GB 5174270 A GB5174270 A GB 5174270A GB 1320966 A GB1320966 A GB 1320966A
Authority
GB
United Kingdom
Prior art keywords
sample
light
ranges
concentrations
absorption
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
GB5174270A
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 GB1320966A publication Critical patent/GB1320966A/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
    • 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
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths

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 Optical Means (AREA)

Abstract

1320966 Photo-electric concentration determination A R LINDBERG 30 Oct 1970 [3 Nov 1969] 51742/70 Heading G1A In an arrangement, light absorption by a sample is measured alternately in two different ranges of wavelength one being narrow and falling within the other, and light energy within the ranges in the absence of a sample is trimmed by absorption filters to be equal so that background absorption due for example to turbidity is compensated when the difference between the energies in the two ranges is used to indicate the concentrations. A two sector filter 8, Fig. 1, is rotated in the light path between the sample 3 and a light operated switch 10, 11 actuates relay contacts R L1, R L2 to apply the alternate photo-cell potentials to capacitors C1 and C2. The difference signal is indicated or recorded at 14, 15 after amplification in 16 and may be linearized to read concentration directly. Resistors R1, R2 provide for adjustment of range and zero.
GB5174270A 1969-11-03 1970-10-30 Method of and apparatus for determining colourimetric concentrations Expired GB1320966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1504869A SE352168B (en) 1969-11-03 1969-11-03

Publications (1)

Publication Number Publication Date
GB1320966A true GB1320966A (en) 1973-06-20

Family

ID=20300055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5174270A Expired GB1320966A (en) 1969-11-03 1970-10-30 Method of and apparatus for determining colourimetric concentrations

Country Status (3)

Country Link
DE (1) DE2053007A1 (en)
GB (1) GB1320966A (en)
SE (1) SE352168B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5178281A (en) * 1974-12-27 1976-07-07 Shimadzu Corp 2 hachobunkokodokei
GB2184230A (en) * 1985-12-17 1987-06-17 Tokyo Gas Co Ltd A method of measuring minor ingredient of gas and apparatus therefor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787124A (en) * 1972-09-21 1974-01-22 Baxter Laboratories Inc Dual wavelength photometer for absorbance difference measurements
EP0020801A1 (en) * 1979-06-15 1981-01-07 Bodenseewerk Geosystem GmbH Double-beam infrared spectrometer
JPS59100862A (en) * 1982-12-01 1984-06-11 Hitachi Ltd Automatic analyzer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5178281A (en) * 1974-12-27 1976-07-07 Shimadzu Corp 2 hachobunkokodokei
JPS5759931B2 (en) * 1974-12-27 1982-12-17 Shimadzu Corp
GB2184230A (en) * 1985-12-17 1987-06-17 Tokyo Gas Co Ltd A method of measuring minor ingredient of gas and apparatus therefor
GB2184230B (en) * 1985-12-17 1989-08-23 Tokyo Gas Co Ltd Method of measuring minor ingredient of gas and apparatus therefor

Also Published As

Publication number Publication date
DE2053007A1 (en) 1971-05-19
SE352168B (en) 1972-12-18

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee