Coulometric analysis method and a device therefor
AssigneeNakano Vinegar Co., Ltd.
InventorsShunichi Uchiyama, Takeshi Sato, Hirofumi Akano, Yoshiya Kawamura
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Abstract
The present invention provides a rapid coulometric analysis for the quantitative determination of a sample substance with high reproducibility without any application of voltage etc. from the outside, as well as a galvanic cell and a device for use in said coulometric analysis. According to the present invention, a wide variety of components can be analyzed by selection of electroactive substance introduced into the galvanic cell. The present invention enables a simple and easy analysis for food components such as glutamic acid, ascorbic acid, etc., water quality such as COD, etc.
Claims28
An apparatus for coulometric analysis for the quantitative determination of a substance in a sample comprising:
- a first electrode containing at least a mediator, wherein said mediator is capable of reacting with said substance to produce a first electroactive species;
- a second electrode containing a second electroactive species, wherein said first electroactive species and said second electroactive species have an electrochemical potential difference;
- an ion-permeable membrane situated between said first and said second electrodes;
- and
- means for measuring an electrical quantity generated by said electrochemical potential difference without application of an external power source, whereby said electrical quantity is used to quantify said substance.
An apparatus for coulometric analysis for the quantitative determination of a substance in a sample comprising:
- a first electrode containing at least a mediator, wherein said mediator is capable of reacting with said substance to produce a first electroactive species;
- a second electrode containing a second electroactive species;
- an ion-permeable membrane situated between said first and said second electrodes;
- and
- means for measuring an electrical quantity generated by at least one self-driven reaction between said first electroactive species and said second electroactive species, whereby said electrical quantity is used to quantify said substance.
An apparatus for coulometric analysis for the quantitative determination of an aqueous substance in a sample comprising:
- a first electrode having a hydrophilic and conductive material that is impregnated with at least a mediator, wherein said mediator is capable of reacting with said sample to produce a first electroactive species;
- a second electrode having a hydrophilic and conductive material that is impregnated with a second electroactive species, wherein said first electroactive species and said second electroactive species have an electrochemical potential difference;
- an ion-permeable membrane situated between said first and said second electrodes;
- and
- means for measuring an electrical quantity generated by said electrochemical potential difference without application of an external power source, whereby said electrical quantity is used to quantify said substance.
The apparatus according to 20, wherein said second electroactive species is selected from the group consisting of hexacyanoferrate (III) ion, hexacyanoferrate (II), permanganate ion, and salts thereof.
An apparatus for coulometric analysis for the quantitative determination of an aqueous non-electroactive substance in a sample comprising:
- a first electrode containing a first aqueous solution including at least the sample and a mediator, wherein said mediator is capable of reacting with said non-electroactive sample to produce a first electroactive species;
- a second electrode containing a second electroactive species;
- an ion-permeable membrane situated between said first and said second electrodes;
- and
- means for measuring an electrical quantity generated by a potential difference between said first and said second electroactive species without application of an external power source, whereby said electrical quantity is used to quantify said substance.
Dependencies are inferred from the claim text.