METHOD FOR QUANTITATIVE DETERMINATION OF OXIDANT AND APPRATUS FOR QUANTITATIVE DETERMINATION OF OXIDANT

• US 20160011118A1
• Filed: 04/21/2014
• Published: 01/14/2016
• Est. Priority Date: 04/26/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: ONODERA, Mari, IMAI, Shin-ichi, KUMAGAI, Hironori
• Granted Patent: US 9,513,227 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01N 2021/755 Comparing readings with/without reagents, or before/after reaction
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 21/75 Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated systems in which material is burnt in a flame or plasma G01N21/72, G01N21/73
• CPC Class Codes: G01N 21/78 producing a change of colour
• CPC Class Codes: G01N 2201/061 Sources
• CPC Class Codes: G01N 2201/127 Calibration; base line adjustment; drift compensation
• CPC Class Codes: G01N 31/005 investigating the presence of an element by oxidation G01N31/12 takes precedence
• CPC Class Codes: G01N 31/228 for peroxides

Abstract

The present invention provides a method for quantitative determination of oxidant which method is capable of accurately and rapidly performing quantitative determination of oxidant at low cost, and an apparatus for quantitative determination of oxidant used in the method. The method for quantitative determination of oxidant according to the present invention is a method for quantitative determination of oxidant performing quantitative determination of oxidant in a sample using a redox reaction, the method including: adding one kind of reducing agent to a sample solution containing one or a plurality of kinds of oxidants having different lifetimes; producing an absorbance curve by measuring a time change in absorbance of the post-color-change or post-coloring reducing agent; and performing the quantitative determination of the oxidant while identifying the oxidant in the sample solution based on the obtained absorbance curve.

Claims

1. A method for quantitative determination of oxidant performing quantitative determination of oxidant in a sample using a redox reaction,

the method comprising:

adding one kind of reducing agent to a sample solution containing one or a plurality of kinds of oxidants having different lifetimes;

producing an absorbance curve by measuring a time change in absorbance of the post-color-change or post-coloring reducing agent; and

performing the quantitative determination of the oxidant while identifying the oxidant in the sample solution based on the obtained absorbance curve.

2. The method for quantitative determination of oxidant according to claim 1, wherein the oxidant in the sample solution is identified by comparing the obtained absorbance curve with a separately-acquired standard approximate curve indicating a time change in absorbance of a well-known oxidant.

3. The method for quantitative determination of oxidant according to claim 2, wherein the obtained absorbance curve is broken down into at least one kind of approximate curve by a curve approximate analysis to calculate a half-value width of each approximate curve and an initial absorbance at the time of zero, and the half-value width of each approximate curve is compared with a half-value width of a separately-acquired standard approximate curve of a well-known oxidant to identify an oxidant attributing to each approximate curve.

4. The method for quantitative determination of oxidant according to claim 3, wherein the quantitative determination of the identified oxidant is performed using the initial absorbance and a separately-acquired calibration curve indicating a relationship between the absorbance and the concentration for a well-known oxidant.

5. The method for quantitative determination of oxidant according to claim 3, wherein the approximate curve is a Gaussian curve.

6. An apparatus for quantitative determination of oxidant used in a method for quantitative determination of oxidant performing quantitative determination of oxidant in a sample using a redox reaction,

the apparatus comprising a measuring unit and a controller,

wherein the measuring unit includes:

a reaction unit that causes a sample solution containing one or a plurality of kinds of oxidants having different lifetimes to react with one kind reducing agent;

a light source that irradiates the reaction unit with light; and

a light receiver that detects light transmitted through the reaction unit to measure an absorbance of the post-color-change or post-coloring reducing agent, and

the controller includes;

a storage in which a standard approximate curve indicating a time change in absorbance of a well-known oxidant and a calibration curve indicating a relationship between the absorbance and a concentration for the well-known oxidant are stored; and

a calculator that produces an absorbance curve by measuring a time change in absorbance of the post-color-change or post-coloring reducing agent, and performs the quantitative determination of the oxidant while identifying the oxidant in the sample solution based on the obtained absorbance curve.

7. The apparatus for quantitative determination of oxidant according to claim 6, wherein the calculator breaks down the obtained absorbance curve into at least one kind of approximate curve by a curve approximate analysis to calculate a half-value width of each approximate curve and an initial absorbance at the time of zero, compares the half-value width of each approximate curve with a half-value width of the standard approximate curve of the well-known oxidant to identify the oxidant attributing to each approximate curve, and performs the quantitative determination of the identified oxidant using the initial absorbance and a separately-acquired calibration curve indicating a relationship between the absorbance and the concentration for the well-known oxidant.