WO2014174818A1 - 酸化物質定量方法および酸化物質定量装置 - Google Patents
酸化物質定量方法および酸化物質定量装置 Download PDFInfo
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- WO2014174818A1 WO2014174818A1 PCT/JP2014/002220 JP2014002220W WO2014174818A1 WO 2014174818 A1 WO2014174818 A1 WO 2014174818A1 JP 2014002220 W JP2014002220 W JP 2014002220W WO 2014174818 A1 WO2014174818 A1 WO 2014174818A1
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- G—PHYSICS
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- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
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- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
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- G—PHYSICS
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- 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
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/005—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods investigating the presence of an element by oxidation
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- G—PHYSICS
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- 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N2021/755—Comparing readings with/without reagents, or before/after reaction
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
- G01N31/228—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators for peroxides
Definitions
- the present invention relates to an oxidizing substance quantification method using an oxidation-reduction reaction and an oxidizing substance quantification apparatus used therefor.
- Detecting or quantifying substances that produce oxidants as a result of oxidants and chemical reactions is important in many areas.
- quantification / monitoring of oxidizing substances in water is very important in terms of the effects and operation management of the apparatus.
- methods for quantifying oxidized substances include enzymatic methods and methods that measure substances that undergo detectable chemical reactions (color changes, etc.) by chemical reaction with the analyte, and various components that are present in body fluids in clinical tests It is used for quantitative and environmental analysis.
- hydrogen peroxide is quantified by adding a substance that undergoes a detectable color change, for example, a leuco dye, as a reducing agent in the presence of peroxidase, and performing a redox reaction to colorimetrically produce a colored substance that is quantitatively generated.
- a detectable color change for example, a leuco dye
- a reducing agent having high selectivity with respect to the known oxidizing substance is usually selected and used.
- a general reducing agent must be used. In such a case, the oxidation-reduction reaction does not proceed quantitatively, and accurate quantification is difficult. There is a case. If accurate quantification is possible even if one kind of reducing agent is used for various oxidizing substances, it is not necessary to prepare various reducing agents, and thus quicker and lower-cost quantification is possible.
- the present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide an oxidant substance quantification method and an oxidant substance quantification apparatus used therefor that can quantitate an oxidant substance accurately, quickly and at low cost.
- the present inventors add one kind of reducing agent to a sample solution containing one kind or a plurality of kinds of oxidants having different lifetimes, and after color change or color development.
- the absorbance curve can be used to determine the amount of oxidized material without being affected by blank coloring due to natural oxidation of the reducing agent.
- the oxidant substance quantification method of the present invention is an oxidant substance quantification method for quantifying an oxidant substance in a sample by using an oxidation-reduction reaction, and is applied to a sample solution containing one kind or a plurality of kinds of oxidant substances having different lifetimes.
- a seed reducing agent is added, an absorbance curve is prepared by measuring the time change of the absorbance of the reducing agent after color change or color development, and based on the obtained absorbance curve, an oxidizing substance in the sample solution And the amount of the oxidized substance is quantified.
- the oxidation substance quantification apparatus of the present invention is an oxide quantification apparatus used in an oxidation substance quantification method for quantifying an oxidant substance in a sample using an oxidation-reduction reaction, and the oxide quantification apparatus includes a measurement unit and a control unit.
- a reaction unit that reacts a sample solution containing one or more kinds of oxidizing substances having different lifetimes with one reducing agent, a light source unit that irradiates light to the reaction unit, and A light receiving portion for detecting the light transmitted from the reaction portion and measuring the absorbance of the reducing agent after color change or color development;
- the control unit stores a reference approximate curve indicating a change in absorbance of a known oxidant with time, a calibration curve indicating a relationship between absorbance and concentration, and the absorbance of the reducing agent after color change or color development.
- An absorbance curve is prepared by measuring a time change of the sample, and an oxidizing substance in the sample solution is identified based on the obtained absorbance curve, and a calculation unit for quantifying the oxidizing substance is provided. To do.
- one type of reducing agent can be used for various oxidizing substances, and no masking agent or blank test is required. Thereby, it becomes possible to perform accurate quantification of the oxidized substance more quickly and at low cost.
- the oxidizing substance targeted by the present invention is not particularly limited.
- An oxidizing substance that can oxidize iodide ions is preferable. Examples include hydrogen peroxide, ozone, radical species, potassium nitrate, hypochlorous acid, chlorous acid, chloric acid, perchloric acid, halogen, permanganate, cerium ammonium nitrate, chromic acid, dichromic acid, peroxygen An oxide etc. can be mentioned. However, when two or more kinds of oxidizing substances are present, it is necessary that each oxidizing substance has a life difference.
- a stable oxidant having a long life eg, hydrogen peroxide
- an unstable oxidant having a short life eg, ozone, radical species, etc.
- the reducing agent is not particularly limited as long as it is water-soluble and causes a color change or color development upon reaction with an oxidizing substance and can be detected by an optical method.
- Examples include potassium iodide and ferrous sulfate, but potassium iodide is preferred.
- a masking agent or a masking process is unnecessary.
- the masking agent is an agent that suppresses the reaction of the reducing agent with an oxidizing substance other than the target oxidizing substance.
- the masking treatment includes not only addition of a masking agent but also chemical modification of the reducing agent in order to prevent the reducing agent from reacting with an oxidizing substance other than the target oxidizing substance.
- FIG. 1 is a schematic diagram showing an example of the configuration of an oxidant concentration quantification apparatus according to the present invention.
- the apparatus includes at least a measurement unit 102 and a control unit 105.
- the measurement unit 102 includes a reaction unit 101 that reacts a sample solution containing one or a plurality of oxidizing substances having different lifetimes with one reducing agent, a light source unit 103 that irradiates the reaction unit 101 with light, and the reaction And a light receiving unit 104 that detects transmitted light from the unit 101 and measures the absorbance of the reducing agent after color change or color development.
- control unit 105 stores a reference approximate curve indicating the time change of the absorbance of the known oxidant substance, a storage unit 107 that stores a calibration curve indicating the relationship between the absorbance and the concentration, and the reducing agent after color change or color development.
- the absorbance change is measured to create an absorbance curve, and the obtained absorbance curve is decomposed into one or more approximate curves by curve approximation analysis to calculate the half-width of each approximate curve and the initial absorbance at time zero.
- the calculating part 106 which quantifies the said identified oxidized substance using the calibration curve which shows the relationship with a density
- the storage unit 107 may be connected to the outside. Further, the reaction unit 101 may be separated from the measurement unit 102.
- an absorbance curve obtained by adding a single reducing agent to the known oxidized substance and measuring the change in absorbance with time can be used.
- one reducing agent is added to a sample solution containing at least one oxidizing substance.
- An optical cell can be used for the reaction unit 101.
- a quartz cell, a glass cell, or a disposable cell made of polystyrene or polymethyl methacrylate can be used.
- the measurement unit 102 the light from the light source 103 is irradiated to the reaction unit 101 through an optical system (not shown), and the transmitted light from the reaction unit 101 is detected by the light receiver 104.
- an ultraviolet-visible spectrophotometer can be used as the measurement unit 102.
- the transmitted light data from the light receiver 104 is sent to the calculation unit 106.
- the calculation unit 106 calculates the absorbance of the reducing agent after the color change or after the color development from the comparison with the incident light data from the light source 103, and further creates an absorbance curve representing the temporal change in the absorbance of the reducing agent. .
- curve approximation analysis is applied to the obtained absorbance curve to decompose it into one or more types of approximate curves, and the half width of each approximate curve and the initial absorbance at time zero are calculated.
- the half-value width of each approximate curve obtained is compared with the half-value width of a reference approximate curve of a known oxidized substance that is separately acquired and stored in the storage unit 107, and the oxidized substances belonging to each approximate curve are identified.
- the full width at half maximum obtained from the approximate curve can be used as a parameter indicating the ease of attenuation of each oxidized substance, and indicates a value specific to each oxidized substance. Therefore, it becomes possible to identify the unknown oxidation substance by comparing the half-value width of the unknown oxidation substance in the sample with the half-value width of the known oxidation substance.
- the identified oxidized substance is quantified using a calibration curve indicating the relationship between the absorbance and the concentration of the known oxidized substance separately obtained and stored in the storage unit 107 and the initial absorbance.
- the storage unit 107 stores a calibration curve for known oxidants.
- the calibration curve is prepared by adding a reducing agent in the same manner as described above for an oxidized substance having a known concentration and measuring the initial absorbance at time zero.
- a calibration curve is created using the initial absorbance and concentration.
- an absorbance curve is created for at least one concentration, curve approximation analysis is applied to the obtained absorbance curve to decompose it into one approximate curve, and the half width of the approximate curve is calculated.
- This half-value width is stored as the half-value width of the known oxidized substance.
- the concentration measured by the potassium permanganate method can be used as the concentration for preparing a calibration curve.
- the concentration measured with an ozone measuring reagent for example, manufactured by Kasa Principle Chemical Co., Ltd.
- the curve approximation analysis used in the present invention is not particularly limited as long as it is a method of approximating various time series data distribution waveforms by mathematical formulas. Gaussian approximation, Maxwell-Boltzmann approximation, Lorentz approximation and the like can be mentioned, but Gaussian approximation is preferable.
- one kind of reducing agent can be used for various oxidizing substances. Moreover, a masking agent and a blank test are unnecessary. Thereby, it becomes possible to perform accurate quantification of the oxidized substance more quickly and at low cost.
- the present invention is useful when sample water containing two or more kinds of oxidizing substances having different lifetimes is targeted.
- accurate quantification is difficult when each oxidizing substance is quantified by the conventional method.
- the enzyme method and the absorbance method using leuco dye which are conventional methods for determining hydrogen peroxide, are quantitative when the only oxidizing substance in the solution is hydrogen peroxide.
- the reducing agent reacts with other oxidizing substances. Therefore, accurate quantification is difficult.
- the potassium iodide method which is a conventional method for determining ozone, is quantitative when the only oxidizing substance in the solution is ozone, but when other oxidizing substances are present in addition to ozone, Since potassium iodide also reacts with other oxidizing substances, the ozone concentration is estimated to be high, so accurate quantification is difficult.
- the present invention pays attention to the fact that the lifetime of each oxidant is different when there are multiple types of oxidant, and is obtained by applying a curve approximation analysis to the absorbance curve representing the change in absorbance of sample water over time.
- the half-value widths of the plurality of approximate curves to be obtained indicate values specific to each oxidizing substance.
- the present invention is particularly useful for sample water containing radical species.
- a plurality of kinds of oxidizing substances such as ozone, hydrogen peroxide, and oxygen-containing radicals are generated in a solution by a submerged plasma apparatus.
- a submerged plasma device generates multiple oxidizing substances such as ozone, hydrogen peroxide, and radicals in the solution, but the reaction mechanism in the water is competitively entangled between the reactions of each oxidizing substance and changes over time. Therefore, it is difficult to quantify the product (for example, OH radicals have a short lifetime and recombine with each other to change to hydrogen peroxide).
- the present invention focuses on the fact that the lifetime of each oxidized material is different when there are a plurality of types of oxidized materials. Therefore, the greater the difference in lifetime, the greater the difference in half-value width. Becomes easy. Further, by using the absorbance at time zero of the approximate curve obtained for each oxidizing substance in the sample water, it is possible to separately calculate the concentrations of radical species and other oxidizing substances.
- Example 1 sample water containing hydrogen peroxide as an oxidizing substance was used as a measurement target.
- the sample water was prepared by adding a predetermined amount of hydrogen peroxide (manufactured by Kanto Chemical) to 250 mL of pure water. Immediately after the addition, the reaction time was 0 minutes, and after a lapse of a predetermined time, a reducing agent mainly composed of 10 mL of pure water and potassium iodide was added to the reaction unit 101 made of disposable cell (made of polymethylmethacrylate) having a cell length of 1 cm. The absorbance of the sample water to which the reducing agent was added (hereinafter referred to as reduced treated water) was measured by the measuring unit 102 every predetermined time.
- reduced treated water absorbance of the sample water to which the reducing agent was added
- the absorbance was measured using a UV-visible spectrophotometer (manufactured by JASCO) at a wavelength range of 400 to 800 nm, a measurement interval of 1.0 nm, a scanning speed of 400 nm / min, and a bandwidth of 2.0 nm.
- the control unit 105 created a graph (absorbance curve) showing the relationship between the absorbance of the maximum peak of iodine at 500 nm to 530 nm and the elapsed time using the absorbance data at predetermined time intervals.
- the calibration curve was created according to the following procedure. That is, with respect to each concentration of hydrogen peroxide solution, a reducing agent mainly composed of pure water and potassium iodide was added to the reaction part 101 made of disposable cell (made of polymethyl methacrylate) having a cell length of 1 cm. The initial absorbance at time zero was measured, and a calibration curve was created using the initial absorbance and concentration. Furthermore, the absorbance of the reduced treated water for one concentration was measured by the measurement unit 102 at predetermined time intervals. Next, a graph (absorbance curve) showing the relationship between the absorbance of the maximum peak of iodine at 500 nm to 530 nm and the elapsed time was prepared using the absorbance data for each predetermined time. A Gaussian curve (referred to as a reference Gaussian curve) was obtained by applying Gaussian approximation to the obtained absorbance curve, and data of the reference Gaussian curve was stored in the storage unit 107. Absorbance measurement was performed as described above.
- FIG. 2 is a graph showing the relationship between the absorbance of the maximum peak at 500 nm to 530 nm and the elapsed time, and the black circle ( ⁇ ) in the figure indicates the absorbance value of the maximum peak at 500 nm to 530 nm.
- the computing unit 106 applied the Gaussian approximation to the absorbance curve in FIG. 2 to obtain a Gaussian curve.
- the obtained Gaussian curve (also called Gaussian function) is shown below.
- FIG. 3 is a calibration curve for hydrogen peroxide.
- the time zero absorbance of the above Gaussian curve corresponds to the hydrogen peroxide concentration at the time of sample water preparation, and the hydrogen peroxide concentration in the sample water can be calculated by using the zero time absorbance.
- the absorbance at time zero was obtained from the above Gaussian curve, and the hydrogen peroxide concentration was calculated using the hydrogen peroxide calibration curve of FIG. A value of 2.5 ⁇ 10 ⁇ 4 mol / L was obtained as the hydrogen peroxide concentration in the sample water.
- the half width of the Gaussian curve obtained for the sample water was in good agreement with the value of the half width obtained from the reference Gaussian curve for hydrogen peroxide.
- Example 2 sample water containing ozone as an oxidizing substance was used as a measurement target.
- Sample water was prepared by connecting an air pump to an ozone generator (manufactured by Chuen Electronics) and introducing the generated ozone into pure water. The initial absorbance at time zero was measured, and a calibration curve was created using the initial absorbance and concentration. Immediately after the addition, the reaction time was 0 minutes, and after a lapse of a predetermined time, a reducing agent mainly composed of 10 mL of pure water and potassium iodide was added to the reaction unit 101 made of disposable cell (made of polymethylmethacrylate) having a cell length of 1 cm. The absorbance of the reduced treated water was measured by the measurement unit 102 every predetermined time. Absorbance measurement was performed in the same manner as in Example 1.
- the control unit 105 created a graph (absorbance curve) showing the relationship between the absorbance of the maximum peak of iodine at 500 nm to 530 nm and the elapsed time using the absorbance data at predetermined time intervals.
- the calibration curve was created according to the following procedure. That is, for each concentration of ozone water, a reducing agent mainly composed of pure water and potassium iodide was added to the reaction section 101 made of a disposable cell (made of polymethyl methacrylate) having a cell length of 1 cm. The initial absorbance at time zero was measured, and a calibration curve was created using the initial absorbance and concentration. Further, the absorbance of the reduced treated water was measured at a measurement unit 102 at predetermined time intervals for one concentration. Next, a graph (absorbance curve) showing the relationship between the absorbance of the maximum peak of iodine at 500 nm to 530 nm and the elapsed time was prepared using the absorbance data for each predetermined time. A Gaussian curve (referred to as a reference Gaussian curve) was obtained by applying Gaussian approximation to the obtained absorbance curve, and data of the reference Gaussian curve was stored in the storage unit 107.
- FIG. 4 is a graph showing the relationship between the absorbance of the maximum peak at 500 nm to 530 nm and the elapsed time, and the black circle ( ⁇ ) in the figure shows the absorbance value of the maximum peak at 500 nm to 530 nm.
- the computing unit 106 applied the Gaussian approximation to the absorbance curve in FIG. 4 to obtain a Gaussian curve.
- the Gaussian curve obtained is shown below.
- FIG. 5 is an ozone calibration curve.
- the absorbance at time zero was obtained from the above Gaussian curve, and the ozone concentration was calculated using the ozone calibration curve of FIG. A value of 1.3 ⁇ 10 ⁇ 6 mol / L was obtained as the ozone concentration in the sample water.
- the value of the half width of the above-mentioned Gaussian curve obtained for the sample water was in good agreement with the value of the half width obtained from the ozone standard Gaussian curve.
- Example 3 sample water containing ozone and hydrogen peroxide as an oxidizing substance was used as a measurement target.
- the sample water was prepared by adding predetermined amounts of ozone and hydrogen peroxide (manufactured by Kanto Chemical) to 250 mL of pure water.
- the ozone was dissolved in pure water by connecting an air pump to an ozone generator (manufactured by Chuen Electronics).
- the reaction time was 0 minutes, and after a lapse of a predetermined time, a reducing agent mainly composed of 10 mL of pure water and potassium iodide was added to the reaction unit 101 made of disposable cell (made of polymethylmethacrylate) having a cell length of 1 cm.
- the absorbance of the sample water to which the reducing agent was added was measured by the measuring unit 102 every predetermined time. Absorbance measurement was performed in the same manner as in Example 1.
- the absorbance data for each predetermined time was sent to the control unit 105, where a graph (absorbance curve) showing the relationship between the absorbance of the maximum peak of iodine at 500 nm to 530 nm and the elapsed time was created.
- FIG. 6 is a graph showing the relationship between the absorbance of the maximum peak at 500 nm to 530 nm and the elapsed time, and the black circle ( ⁇ ) in the figure indicates the absorbance value of the maximum peak at 500 nm to 530 nm. From FIG. 6, it can be seen that there are an attenuation region (referred to as region A) of about 20 minutes to about 100 minutes and an attenuation region (B region) that maintains a stable and constant concentration after about 100 minutes.
- region A an attenuation region
- B region an attenuation region
- the calculation unit 106 applied the Gaussian approximation to the A region and the B region of the absorbance curve in FIG. 6 to obtain a Gaussian curve.
- the Gaussian curve obtained is shown below.
- Half-width of the Gaussian curve is a parameter representing the life of each oxidant, the half width of the curve 1 is 2 ⁇ 172 2, the half width of the curve 2 is 2 ⁇ 1613 2.
- These half-value width values are created in Example 1 and Example 2, the half-value widths of the reference Gaussian curves of ozone and hydrogen peroxide stored in the storage unit 107 are compared, and the half-value widths of the reference Gaussian curves are compared. Were confirmed to match the full width at half maximum of Curve 1 and Curve 2, respectively.
- the zero-time absorbances of curve 1 and curve 2 were obtained from FIG. 6, and the ozone concentration and the hydrogen peroxide concentration were calculated using the calibration curve of ozone and hydrogen peroxide stored in the storage unit 107.
- the ozone concentration in the sample water was 2.5 ⁇ 10 ⁇ 5 mol / L
- the hydrogen peroxide concentration was 6.9 ⁇ 10 ⁇ 5 mol / L.
- Example 4 sample water containing radical species, ozone, and hydrogen peroxide as an oxidizing substance was used as a measurement target.
- plasma treatment was performed for 250 mL of pure water (prepared by mixing conductivity 20 mS / m and sodium sulfate) for 10 minutes. Immediately after completion of the treatment, 0 minute was set, and 10 mL of a sample after a certain period of time and a reducing agent mainly composed of potassium iodide were added to the reaction unit 101. The absorbance of the reduced treated water was measured by the measurement unit 102 every predetermined time. Absorbance measurement was performed in the same manner as in Example 1.
- FIG. 7 is a graph showing the relationship between the absorbance of the maximum peak at 500 nm to 530 nm and the elapsed time, and the black circle ( ⁇ ) in the figure indicates the absorbance value of the maximum peak at 500 nm to 530 nm. From FIG. 7, an attenuation region (C region) of 0 to about 20 minutes, an attenuation region (referred to as region A) of about 20 minutes to about 100 minutes, and an attenuation region that maintains a stable and constant concentration after about 100 minutes (A region). It can be seen that (B region) exists.
- the calculation unit 106 applied the Gaussian approximation to the A region, the B region, and the C region of the absorbance curve in FIG.
- the obtained Gaussian curve (also called Gaussian function) is shown below.
- FWHM of curve 1 is 2 ⁇ 172 2
- the half width of the curve 2 is 2 ⁇ 1613 2.
- These half-value width values are created in Example 1 and Example 2, and compared with the half-value widths of the standard Gaussian curves of ozone and hydrogen peroxide stored in the storage unit 107, and the half-value widths of the standard Gaussian curves are compared. Were confirmed to match the full width at half maximum of Curve 1 and Curve 2, respectively.
- the attribution of the curve 3 can be estimated as, for example, a radical species because it is an oxidizing substance different from hydrogen peroxide and ozone, for example, because the decay time is short.
- the zero-time absorbances of curve 1 and curve 2 were obtained from FIG. 7, and the ozone concentration and hydrogen peroxide concentration were calculated using the calibration curve of ozone and hydrogen peroxide stored in the storage unit 107.
- the ozone concentration in the sample water was 2.5 ⁇ 10 ⁇ 5 mol / L
- the hydrogen peroxide concentration was 6.9 ⁇ 10 ⁇ 5 mol / L.
- the present invention it is possible to quantitate an oxidizing substance accurately, quickly and at low cost without being affected by blank coloring due to natural oxidation of the reducing agent using one kind of reducing agent.
- concentration of each oxidizing substance can be accurately quantified. This is useful for water quality monitoring and water treatment device operation management. It can also be applied to uses such as quantitative analysis and environmental analysis of various components present in body fluids in clinical tests.
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Abstract
Description
該制御部が、既知酸化物質の吸光度の時間変化を示す基準近似曲線と、吸光度と濃度との関係を示す検量線とを記憶する記憶部と、色変化後または発色後の該還元剤の吸光度の時間変化を測定して吸光度曲線を作成し、得られた該吸光度曲線に基づいて、前記試料溶液中の酸化物質を同定するともに、当該酸化物質を定量する演算部とを有することを特徴とする。
本実施例では、酸化物質として過酸化水素を含む試料水を測定対象に用いた。
試料水は、純水250mLに過酸化水素(関東化学製)を所定量添加して調製した。添加直後を0分とし、そこから所定時間経過後、純水10mLとヨウ化カリウムを主成分とする還元剤をセル長1cmのディスポセル(ポリメチルメタクリレート製)から成る反応部101に添加した。還元剤を添加した試料水(以下、還元処理水という)の吸光度を測定部102にて所定時間毎に測定した。なお、吸光度測定は、(日本分光製)紫外可視分光光度計を用い、波長範囲400~800nm、測定間隔1.0nm、走査速度は400nm/分、バンド幅2.0nmで行った。
過酸化水素の検量線作成には、1.3×10-5~6.3×10-4mol/Lの濃度範囲に調製した5種類の過酸化水素水を用いた。なお、検量線に用いた過酸化水素の濃度は、過マンガン酸カリウム法を用いて測定した。取得した検量線データは記憶部107に保存した。
図2は、500nm~530nmにおける極大ピークの吸光度と経過時間との関係を示すグラフであり、図中の黒丸(●)は、500nm~530nmにおける極大ピークの吸光度の値を示している。演算部106により、図2の吸光度曲線について、ガウス近似を適用してガウス曲線を求めた。以下に得られたガウス曲線(ガウス関数ともいう)を示す。
本実施例では、酸化物質としてオゾンを含む試料水を測定対象に用いた。
試料水は、オゾン発生器(中遠電子製)に空気ポンプを接続し、発生したオゾンを純水に導入することにより調製した。時間ゼロにおける初期吸光度を測定し、その初期吸光度と濃度を用いて検量線を作成した。添加直後を0分とし、そこから所定時間経過後、純水10mLとヨウ化カリウムを主成分とする還元剤をセル長1cmのディスポセル(ポリメチルメタクリレート製)から成る反応部101に添加した。還元処理水の吸光度を測定部102にて所定時間毎に測定した。吸光度測定は、実施例1と同様の方法で行った。
オゾンの検量線作成には、1.0×10-5~3.1×10-5mol/Lの濃度範囲に調製した5種類のオゾン水溶液を用いた。取得した検量線データは記憶部107に保存した。なお、検量線に用いたオゾンの濃度は、オゾン測定試薬(笠原理化工業製)を用いて測定した。
図4は、500nm~530nmにおける極大ピークの吸光度と経過時間との関係を示すグラフであり、図中の黒丸(●)は、500nm~530nmにおける極大ピークの吸光度の値を示している。演算部106により、図4の吸光度曲線について、ガウス近似を適用してガウス曲線を求めた。以下に得られたガウス曲線を示す。
本実施例は、酸化物質としてオゾンと過酸化水素を含む試料水を測定対象に用いた。
試料水は、純水250mLにオゾンと過酸化水素(関東化学製)を所定量添加して調製した。オゾンは、オゾン発生器(中遠電子製)に空気ポンプを接続して純水に溶解させた。添加直後を0分とし、そこから所定時間経過後、純水10mLとヨウ化カリウムを主成分とする還元剤をセル長1cmのディスポセル(ポリメチルメタクリレート製)から成る反応部101に添加した。還元剤を添加した試料水(以下、還元処理水という)の吸光度を測定部102にて所定時間毎に測定した。吸光度測定は、実施例1と同様に行った。
図6は、500nm~530nmにおける極大ピークの吸光度と経過時間との関係を示すグラフであり、図中の黒丸(●)は、500nm~530nmにおける極大ピークの吸光度の値を示している。図6より、約20分~約100分の減衰領域(A領域という)と、約100分以降の安定で一定の濃度を保つ減衰領域(B領域)が存在することがわかる。
本実施例は、酸化物質としてラジカル種とオゾンと過酸化水素を含む試料水を測定対象に用いた。
図7は、500nm~530nmにおける極大ピークの吸光度と経過時間との関係を示すグラフであり、図中の黒丸(●)は、500nm~530nmにおける極大ピークの吸光度の値を示している。図7より、0~約20分の減衰領域(C領域)と、約20分~約100分の減衰領域(A領域という)と、約100分以降の安定で一定の濃度を保つ減衰領域(B領域)が存在することがわかる。
102 測定部
103 光源
104 受光器
105 制御部
106 演算部
107 記憶部
Claims (7)
- 試料中の酸化物質を酸化還元反応を用いて定量する酸化物質定量方法であって、
1種または寿命の異なる複数種の酸化物質を含む試料溶液に1種の還元剤を添加し、色変化後または発色後の該還元剤の吸光度の時間変化を測定して吸光度曲線を作成し、得られた該吸光度曲線に基づいて、前記試料溶液中の酸化物質を同定するともに、当該酸化物質を定量する、該酸化物質定量方法。 - 前記の得られた吸光度曲線と、既知酸化物質の吸光度の時間変化を示す別途取得した基準近似曲線とを比較して、前記試料溶液中の酸化物質を同定する請求項1記載の酸化物質定量方法。
- 前記の得られた吸光度曲線を曲線近似解析により1種以上の近似曲線に分解して各該近似曲線の半値幅と時間ゼロにおける初期吸光度を算出し、各該近似曲線の半値幅と別途取得した既知酸化物質の基準近似曲線の半値幅とを比較して各該近似曲線に帰属される酸化物質を同定する請求項2記載の酸化物質定量方法。
- 別途取得した既知酸化物質における吸光度と濃度との関係を示す検量線と前記の初期吸光度を用いて、前記の同定された酸化物質を定量する、請求項3記載の酸化物質定量方法。
- 前記の近似曲線がガウス曲線である請求項3記載の酸化物質定量方法。
- 試料中の酸化物質を酸化還元反応を用いて定量する酸化物質定量方法に用いる酸化物定量装置であって、
該酸化物定量装置が測定部と制御部とを備え、
該測定部が、1種または寿命の異なる複数種の酸化物質を含む試料溶液と1種の還元剤とを反応させる反応部と、該反応部へ光を照射する光源部と、該反応部からの透過光を検出して色変化後または発色後の該還元剤の吸光度を測定する受光部とを有し、
該制御部が、既知酸化物質の吸光度の時間変化を示す基準近似曲線と、吸光度と濃度との関係を示す検量線とを記憶する記憶部と、色変化後または発色後の該還元剤の吸光度の時間変化を測定して吸光度曲線を作成し、得られた該吸光度曲線に基づいて、前記試料溶液中の酸化物質を同定するともに、当該酸化物質を定量する演算部とを有する、該酸化物定量装置。 - 前記演算部が、前記吸光度曲線を曲線近似解析により1種以上の近似曲線に分解して各該近似曲線の半値幅と時間ゼロにおける初期吸光度を算出し、各該近似曲線の半値幅と既知酸化物質の前記基準近似曲線の半値幅とを比較して各該近似曲線に帰属される酸化物質を同定する一方、別途取得した既知酸化物質における吸光度と濃度との関係を示す検量線と前記の初期吸光度を用いて、前記の同定された酸化物質を定量する、請求項6記載の酸化物定量装置。
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