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1. WO1996018096 - QUANTITATIVE DETECTION OF CHEMICAL SPECIES

Publication Number WO/1996/018096
Publication Date 13.06.1996
International Application No. PCT/GB1995/002862
International Filing Date 08.12.1995
Chapter 2 Demand Filed 08.07.1996
IPC
G01N 21/17 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
G01N 21/33 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
33using ultra-violet light
G01N 21/63 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
63optically excited
G01N 21/75 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
75Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
CPC
G01N 21/1717
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
1717with a modulation of one or more physical properties of the sample during the optical investigation, e.g. electro-reflectance
G01N 21/33
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
33using ultra-violet light
G01N 21/631
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
63optically excited
631using photolysis and investigating photolysed fragments
G01N 21/75
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
75Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
Applicants
  • UNITED UTILITIES PLC [GB]/[GB] (AllExceptUS)
  • JOHNSON, Mark [GB]/[GB] (UsOnly)
Inventors
  • JOHNSON, Mark
Agents
  • ALLMAN, Peter, John
Priority Data
9424922.409.12.1994GB
9502683.711.02.1995GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) QUANTITATIVE DETECTION OF CHEMICAL SPECIES
(FR) DETECTION QUANTITATIVE D'ESPECES CHIMIQUES
Abstract
(EN)
A method and apparatus for determining the concentration of a target chemical species in a sample. A first spectrum is generated representing the absorbance of the sample across a range of wavelengths. The sample is then exposed to conditions which modify the concentration of the target chemical species in the sample, for example by irradiating the sample with UV or visible light which degrades the target chemical species, or generating an active species flux through the sample by exposing the sample to a corona discharge. The absorbance of the sample is then remeasured across the same range of wavelengths and differences between the two spectra are analysed to quantify the concentration of the target chemical species in the unmodified sample.
(FR)
Procédé et dispositif de détermination de la concentration d'une espèce chimique cible dans un échantillon. Un premier spectre est produit qui représente l'absorbance de l'échantillon sur une gamme de longueurs d'ondes. On expose ensuite l'échantillon à des conditions qui modifient, dans l'échantillon, la concentration de l'espèce chimique cible, par exemple, en soumettant cet échantillon à un rayonnement U.V. ou à une lumière visible, ce qui a pour effet de dégrader l'espèce chimique cible, ou bien en générant un flux actif de l'espèce à travers l'échantillon en exposant celui-ci à une décharge par effet corona. On mesure ensuite à nouveau l'absorbance de l'échantillon sur la même gamme de longueurs d'ondes, et on analyse les différences entre les deux spectres afin de quantifier la concentration de l'espèce chimique cible dans l'échantillon non modifié.
Also published as
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