JP2021067522A - Analytical device and analytical method - Google Patents

Abstract

To provide an analytical device and an analytical method that can prevent deterioration of components due to humidity and measure concentration of a nitrogen component in a sample while stably generating ozone.SOLUTION: An ozone generator 5 generates ozone. A reaction section 6 reacts the ozone generated from the ozone generator 5 with a nitrogen component in a sample. A photo detector 8 detects light generated at the time of reaction in the reaction section 6. A switching mechanism 30 can switch gas to be supplied to the ozone generator 5 to at least either of a first gas and a second gas having a water content higher than that of the first gas.SELECTED DRAWING: Figure 1

Description

The present invention relates to an analyzer and an analysis method.

A total nitrogen meter is known as an example of an analyzer for measuring the concentration of a nitrogen component contained in a sample (see, for example, Patent Document 1 below). The total nitrogen meter measures the concentration of nitrogen components such as nitrate nitrogen, nitrite nitrogen, ammonia nitrogen or organic nitrogen contained in a liquid sample, for example.

A chemiluminescent total nitrogen meter as disclosed in Patent Document 1 is provided with an ozone generator for generating ozone. The nitrogen component contained in the sample is thermally decomposed and vaporized by being heated in a combustion tube having a catalyst. As a result, nitric oxide (NO) is generated from the nitrogen component in the sample. _{Nitrogen dioxide (NO 2} ) is generated by the reaction of the generated nitric oxide with the ozone generated from the ozone generator. Since chemiluminescence is generated when nitrogen dioxide is generated, the concentration of the nitrogen component in the sample can be measured by measuring the amount of luminescence.

The analyzer for measuring the concentration of nitrogen components in the sample includes not only the above-mentioned total nitrogen meter but also the concentration of nitrogen oxides (NOx) contained in the sample gas collected from the exhaust gas, for example. Also includes a gas analyzer for the purpose. Also in this type of gas analyzer, the concentration of nitrogen component in the sample may be measured using an ozone generator.

Japanese Unexamined Patent Publication No. 11-258226

Compressed air is supplied to the ozone generator from a gas supply source. The ozone generator is provided with, for example, a pair of electrodes, and an oxygen component in the compressed air is ozone-ized by generating an electric discharge between the pair of electrodes in an atmosphere in which compressed air is supplied.

When the amount of water in the compressed air supplied to the ozone generator is large, the water and impurities in the compressed air adhere to parts such as electrodes, and the parts tend to deteriorate. Therefore, as the compressed air supplied to the ozone generator, a dry gas having a small amount of water is generally used. However, when a dry gas is used, discharge is less likely to occur between the pair of electrodes at the start timing of ozone generation. As a result, discharge failure is likely to occur, and ozone may not be generated stably.

The present invention has been made in view of the above circumstances, and is an analysis capable of suppressing deterioration of parts due to humidity and measuring the concentration of nitrogen components in a sample while stably generating ozone. It is an object of the present invention to provide an apparatus and an analysis method.

The first aspect of the present invention is an analyzer for measuring the concentration of nitrogen components contained in a sample, which includes an ozone generator, a reaction unit, a photodetector, and a switching mechanism. The ozone generator generates ozone. The reaction unit reacts ozone generated from the ozone generator with a nitrogen component in the sample. The photodetector detects the light generated during the reaction in the reaction section. The switching mechanism can switch the gas supplied to the ozone generator to at least one of a first gas and a second gas having a water content higher than that of the first gas.

In the second aspect of the present invention, ozone generated from an ozone generator is reacted with a nitrogen component in a sample, and the light generated during the reaction is detected by a photodetector to determine the concentration of the nitrogen component contained in the sample. An analysis method for measurement, which comprises a step of switching the gas supplied to the ozone generator to at least one of a first gas and a second gas having a water content higher than that of the first gas. .. In the switching step, the second gas is supplied to the ozone generator at the start timing of ozone generation in the ozone generator, and the first gas is supplied to the ozone generator after the start timing.

According to the first aspect of the present invention, the first gas and the second gas having different water contents can be selectively supplied to the ozone generator by the switching mechanism. By switching the gas by the switching mechanism at an appropriate timing, deterioration of parts due to humidity can be suppressed, and the concentration of nitrogen component in the sample can be measured while stably generating ozone.

According to the second aspect of the present invention, the first gas and the second gas having different water contents can be selectively supplied to the ozone generator. By switching the gas at an appropriate timing, deterioration of parts due to humidity can be suppressed, and the concentration of nitrogen component in the sample can be measured while stably generating ozone.

It is the schematic which showed the 1st Embodiment of the analyzer. It is the schematic which showed an example of the structure of a humidifier. It is the schematic which showed the other example of the structure of a humidifier. It is a flowchart which showed an example of the mode of gas supply at the time of ozone generation in 1st Embodiment. It is a flowchart which showed other example of the mode of gas supply at the time of ozone generation in 1st Embodiment. It is the schematic which showed the 2nd Embodiment of the analyzer. It is a flowchart which showed an example of the mode of gas supply at the time of ozone generation in 2nd Embodiment. It is a flowchart which showed other example of the mode of gas supply at the time of ozone generation in 2nd Embodiment.

1. 1. First Embodiment of Analytical Device FIG. 1 is a schematic view showing a first embodiment of an analyzer. This analyzer is a chemiluminescent total nitrogen meter, for example, a device for measuring the concentration of nitrogen components such as nitrate nitrogen, nitrite nitrogen, ammonia nitrogen or organic nitrogen contained in a liquid sample. is there.

The analyzer of FIG. 1 is provided with a gas source 1, a regulating valve 2, a switching valve 3, a humidifier 4, an ozone generator 5, a reaction unit 6, a thermal decomposition unit 7, a photodetector 8, a control unit 9, and the like. ing. The control unit 9 includes a processor such as a CPU (Central Processing Unit), and controls the operation of the analyzer by executing a computer program by the processor. A regulating valve 2, a switching valve 3, a humidifier 4, an ozone generator 5, a photodetector 8, and the like are electrically connected to the control unit 9.

The gas source 1 includes, for example, a gas cylinder, and supplies a dry gas with few impurities such as compressed air, high-purity purified air, or high-purity cylinder air. The gas supplied from the gas source 1 is introduced into the switching valve 3 via the regulating valve 2. The adjusting valve 2 adjusts the pressure and the flow rate of the gas introduced from the gas source 1 to the switching valve 3. The operation of the regulating valve 2 may be automatically performed by the control unit 9 or may be performed manually. The configuration of the regulating valve 2 is arbitrary, but may be, for example, a configuration including a bellows valve and a flow meter.

Two flow paths 31 and 32 are fluidly connected to the switching valve 3. The flow path 31 communicates with the ozone generator 5 via the humidifier 4. On the other hand, the flow path 32 is a bypass flow path that communicates with the ozone generator 5 without passing through the humidifier 4. The switching valve 3 is provided with, for example, an electromagnetic valve, and gas from the gas source 1 is selectively introduced into either the flow path 31 or the flow path 32. The switching operation by the switching valve 3 may be automatically performed by the control unit 9 or may be performed manually.

The gas introduced into the flow path 31 from the switching valve 3 is humidified by the humidifier 4 and then supplied to the ozone generator 5. The gas humidified by the humidifier 4 has a water content of, for example, a dew point of about 10 ° C. On the other hand, the gas introduced from the switching valve 3 into the flow path 32 is supplied to the ozone generator 5 without going through the humidifier 4, so that the water content is, for example, about −30 ° C. dew point.

In the switching valve 3 and the flow paths 31 and 32, the gas supplied to the ozone generator 5 is a gas not humidified by the humidifier 4 (first gas) or a gas humidified by the humidifier 4 (first gas). It constitutes a switching mechanism 30 that can be switched to any of the second gas) having a water content larger than that of the gas. In this way, the humidifier 4 humidifies the first gas to generate a second gas having a larger amount of water than the first gas. The operation of the humidifier 4 may be performed automatically by the control unit 9 or may be performed manually. However, the switching mechanism 30 may be able to switch not only the first gas and the second gas but also other gases.

The ozone generator 5 generates ozone by ozoneizing the oxygen component in the gas supplied from the gas source 1. The ozone generator 5 includes, for example, a pair of electrodes 51. The pair of electrodes 51 face each other at a distance from each other, and discharge is generated by applying a voltage from the AC power supply 52 to each of them.

By generating an electric discharge between the pair of electrodes 51 in an atmosphere in which a gas containing an oxygen component is supplied, the oxygen component in the gas can be ozone-ized. The operation of the ozone generator 5 (application of an AC voltage to the pair of electrodes 51) may be performed automatically by the control unit 9 or may be performed manually. The ozone generator 5 generates ozone by discharging using, for example, a creeping discharge method or a silent discharge method, and its configuration is arbitrary.

The ozone generated from the ozone generator 5 is supplied to the reaction unit 6. Further, the nitrogen component in the sample is supplied to the reaction unit 6 from the thermal decomposition unit 7. The pyrolysis unit 7 includes a combustion pipe 71 and an electric furnace 72. The combustion pipe 71 is heated to about 700 to 800 ° C. by the electric furnace 72. The combustion pipe 71 is filled with a catalyst, and the sample introduced into the combustion pipe 71 together with the carrier gas is heated while in contact with the catalyst. As a result, the nitrogen component in the sample is thermally decomposed and vaporized to generate nitric oxide (NO).

The reaction unit 6 is provided with, for example, a reaction vessel (not shown), and chemically reacts the nitrogen component in the sample supplied into the reaction vessel with ozone. _{Specifically, nitrogen dioxide (NO 2} ) is generated by the reaction of nitric oxide generated in the pyrolysis unit 7 with ozone. When nitrogen dioxide is generated, chemiluminescence is generated, and the light generated during the reaction is detected by the photodetector 8. The amount of light emitted during the reaction is proportional to the concentration of the nitrogen component contained in the sample. Therefore, the concentration of the nitrogen component in the sample can be measured by performing the calculation in the control unit 9 based on the amount of light emitted by the photodetector 8. The gas after reacting in the reaction section 6 is exhausted after being appropriately treated.

2. Humidifier Configuration FIG. 2A is a schematic diagram showing an example of the configuration of the humidifier 4. The humidifier 4 includes a storage unit 41 in which a liquid such as water is stored. The flow path 31 communicating with the switching valve 3 is separated into a first flow path 311 and a second flow path 312. The first flow path 311 and the second flow path 312 communicate with each other via the storage unit 41.

One end of the first flow path 311 communicates with the switching valve 3, and the other end is located below the water surface 411 of the water in the storage portion 41. On the other hand, one end of the second flow path 312 is located above the water surface 411 of the water in the storage unit 41, and the other end communicates with the ozone generator 5. According to such a configuration, the gas supplied from the switching valve 3 to the humidifier 4 can be humidified by bubbling.

Specifically, the gas introduced from the switching valve 3 into the first flow path 311 is released into the water stored in the storage unit 41 to form bubbles and float in the water. Then, the bubble that has reached the water surface 411 is released into the space 412 above the water surface 411 in the storage unit 41 and flows into the second flow path 312. The gas from the switching valve 3 is humidified in the process of floating in the water in the storage unit 41 as a bubble. Since the water in the reservoir 41 gradually decreases, it is regularly replenished.

The flow path 32 communicates with the second flow path 312. Therefore, when a gas (first gas) is introduced from the switching valve 3 into the flow path 32, the gas flows into the second flow path 312 without being humidified by the humidifier 4 and is supplied to the ozone generator 5. (First state). On the other hand, when a gas (first gas) is introduced from the switching valve 3 into the flow path 31, the gas is humidified by the humidifier 4, and the humidified gas (second gas) passes through the second flow path 312. Is supplied to the ozone generator 5 (second state). In this way, the switching valve 3 can switch to the first state or the second state.

FIG. 2B is a schematic view showing another example of the configuration of the humidifier 4. The humidifier 4 includes a storage unit 41 in which a liquid such as water is stored, as in the example of FIG. 2A. The flow path 31 communicating with the switching valve 3 is not separated as in the example of FIG. 2A, and a part thereof constitutes an insertion portion 313 to be inserted into the water in the storage portion 41.

In the flow path 31, at least the insertion portion 313 is composed of a semipermeable membrane tube. The semipermeable membrane tube can humidify the gas flowing inside by allowing moisture to permeate from the outside while preventing the gas inside from leaking to the outside. Therefore, the gas supplied from the switching valve 3 to the humidifier 4 can be humidified by inserting the insertion portion 313 of the flow path 31 into the water in the storage portion 41. Since the water in the reservoir 41 gradually decreases, it is regularly replenished.

The flow path 32 communicates with the flow path 31 on the downstream side of the insertion portion 313. Therefore, when a gas (first gas) is introduced from the switching valve 3 into the flow path 32, the gas flows into the flow path 31 without being humidified by the humidifier 4 and is supplied to the ozone generator 5 ( First state). On the other hand, when a gas (first gas) is introduced from the switching valve 3 into the flow path 31, the gas is humidified by the humidifier 4, and the humidified gas (second gas) is supplied to the ozone generator 5. (Second state). In this way, the switching valve 3 can switch to the first state or the second state.

3. 3. Gas supply at the time of ozone generation in the first embodiment FIG. 3A is a flowchart showing an example of the mode of gas supply at the time of ozone generation in the first embodiment. In this example, before driving the ozone generator 5, the switching valve 3 is first communicated with the flow path 32 to supply gas to the ozone generator 5 without going through the humidifier 4 (step S101). .. In this state, the first gas having a small amount of water is supplied to the ozone generator 5.

After that, for example, when the measurement is started by the user's operation (Yes in step S102), the flow path is switched by the switching mechanism 30, so that gas is supplied from the flow path 31 to the ozone generator 5 via the humidifier 4. (Step S103). As a result, the first gas is humidified, and a second gas having a higher water content than the first gas is generated.

In this way, when the operation of the ozone generator 5 is started in the state where the first gas is humidified and supplied to the ozone generator 5 (second state) (step S104), ozone is generated from the ozone generator 5. Occurs. Therefore, at the start timing of ozone generation in the ozone generator 5, the second gas having a larger water content than the first gas is supplied to the ozone generator 5.

After that, when a predetermined time elapses (Yes in step S105), the flow path is switched by the switching mechanism 30, so that gas is supplied from the flow path 32 to the ozone generator 5 without going through the humidifier 4 (step S106). ). As a result, the first gas is supplied to the ozone generator 5 without being humidified (first state), and the first gas having a small amount of water is supplied to the ozone generator 5 again. That is, the first gas is supplied to the ozone generator 5 after the start timing of ozone generation in the ozone generator 5. The predetermined time is the minimum time required from the start of driving the ozone generator 5 to the generation of ozone, and is not particularly limited, but is set to a fixed time such as 10 seconds.

FIG. 3B is a flowchart showing another example of the mode of gas supply at the time of ozone generation in the first embodiment. Also in this example, before driving the ozone generator 5, the switching valve 3 is first communicated with the flow path 32 to supply gas to the ozone generator 5 without going through the humidifier 4 (step S201). ). In this state, the first gas having a small amount of water is supplied to the ozone generator 5.

After that, for example, when the measurement is started by the user's operation (Yes in step S202), the flow path is switched by the switching mechanism 30, so that gas is supplied from the flow path 31 to the ozone generator 5 via the humidifier 4. (Step S203). As a result, the first gas is humidified, and a second gas having a higher water content than the first gas is generated.

In this way, when the operation of the ozone generator 5 is started in the state where the first gas is humidified and supplied to the ozone generator 5 (second state) (step S204), ozone is generated from the ozone generator 5. Occurs. Therefore, at the start timing of ozone generation in the ozone generator 5, the second gas having a larger water content than the first gas is supplied to the ozone generator 5.

In this example, the generation of ozone in the ozone generator 5 is detected after the start of driving the ozone generator 5 (step S205). Since light is generated when ozone is generated by the ozone generator 5, if a mechanism for detecting the light (for example, a photo sensor) is provided, the generation of ozone can be detected by light. Further, since the amount of current flowing through the ozone generator 5 changes when ozone is generated, the generation of ozone may be detected by detecting the amount of current with a detection unit such as an ammeter. As described above, the detection unit has an arbitrary configuration as long as it can detect the generation of ozone in the ozone generator 5.

When the generation of ozone in the ozone generator 5 is detected (Yes in step S205), the flow path is switched by the switching mechanism 30, so that gas is discharged from the flow path 32 to the ozone generator 5 without going through the humidifier 4. It is supplied (step S206). As a result, the first gas is supplied to the ozone generator 5 without being humidified (first state), and the first gas having a small amount of water is supplied to the ozone generator 5 again. That is, the first gas is supplied to the ozone generator 5 after the start timing of ozone generation in the ozone generator 5.

4. Second Embodiment of the Analytical Device FIG. 4 is a schematic view showing a second embodiment of the analyzer. The analyzer according to the second embodiment is the first embodiment except that the humidifier 4 in the first embodiment is replaced with the dehumidifier 10 and the water content of the gas supplied from the gas source 1 is different. It has the same configuration as the form. Therefore, for the same configuration as that of the first embodiment, the same reference numerals are given to the drawings, and detailed description thereof will be omitted.

The gas source 1 includes, for example, a gas cylinder and supplies a gas having a relatively large amount of water (second gas). The dehumidifier 10 includes, for example, a heat exchanger that cools and dehumidifies the gas introduced into the flow path 31 from the switching valve 3. As a result, the gas introduced into the flow path 31 from the switching valve 3 is dehumidified by the dehumidifier 10 and then supplied to the ozone generator 5. The gas dehumidified by the dehumidifier 10 has a water content of, for example, a dew point of about −30 ° C. On the other hand, the gas introduced from the switching valve 3 into the flow path 32 is supplied to the ozone generator 5 without going through the dehumidifier 10, so that the water content is, for example, about 10 ° C. at the dew point.

In the switching valve 3 and the flow paths 31 and 32, the gas supplied to the ozone generator 5 is dehumidified by the dehumidifier 10 (first gas) or not dehumidified by the dehumidifier 10 (first gas). It constitutes a switching mechanism 30 that can be switched to any of the second gas), which has a larger amount of water than the gas). In this way, the dehumidifier 10 dehumidifies the second gas to generate a first gas having a smaller amount of water than the second gas. The operation of the dehumidifier 10 may be performed automatically by the control unit 9 or may be performed manually.

The flow path 32 communicates with the flow path 31 on the downstream side of the dehumidifier 10. Therefore, when a gas (second gas) is introduced from the switching valve 3 into the flow path 31, the gas is dehumidified by the dehumidifier 10, and the dehumidified gas (first gas) is supplied to the ozone generator 5. (First state). On the other hand, when a gas (second gas) is introduced from the switching valve 3 into the flow path 32, the gas flows into the flow path 31 without being dehumidified by the dehumidifier 10 and is supplied to the ozone generator 5 ( Second state). In this way, the switching valve 3 can switch between the first state and the second state.

5. Gas supply at the time of ozone generation in the second embodiment FIG. 5A is a flowchart showing an example of the mode of gas supply at the time of ozone generation in the second embodiment. In this example, before driving the ozone generator 5, the switching valve 3 is first communicated with the flow path 31 to supply gas to the ozone generator 5 via the dehumidifier 10 (step S301). In this state, the dehumidification of the second gas produces a first gas having a smaller water content than the second gas.

After that, for example, when the measurement is started by the user's operation (Yes in step S302), the flow path is switched by the switching mechanism 30, so that gas is discharged from the flow path 32 to the ozone generator 5 without going through the dehumidifier 10. It is supplied (step S303). As a result, the second gas having a larger amount of water than the first gas is supplied to the ozone generator 5.

As described above, when the operation of the ozone generator 5 is started in the state where the second gas is supplied to the ozone generator 5 without being dehumidified (second state) (step S304), the ozone generator 5 starts to drive. Ozone is generated. Therefore, at the start timing of ozone generation in the ozone generator 5, the second gas having a larger water content than the first gas is supplied to the ozone generator 5.

After that, when a predetermined time elapses (Yes in step S305), the flow path is switched by the switching mechanism 30, so that gas is supplied from the flow path 31 to the ozone generator 5 via the dehumidifier 10 (step S306). .. As a result, the second gas is dehumidified and supplied to the ozone generator 5 (first state), and the first gas having a small amount of water is supplied to the ozone generator 5 again. That is, the first gas is supplied to the ozone generator 5 after the start timing of ozone generation in the ozone generator 5. The predetermined time is the minimum time required from the start of driving the ozone generator 5 to the generation of ozone, and is not particularly limited, but is set to a fixed time such as 10 seconds.

FIG. 5B is a flowchart showing another example of the mode of gas supply at the time of ozone generation in the second embodiment. Also in this example, before driving the ozone generator 5, the switching valve 3 is first communicated with the flow path 31 to supply gas to the ozone generator 5 via the dehumidifier 10 (step S401). .. In this state, the dehumidification of the second gas produces a first gas having a smaller water content than the second gas.

After that, for example, when the measurement is started by the user's operation (Yes in step S402), the flow path is switched by the switching mechanism 30, so that gas is discharged from the flow path 32 to the ozone generator 5 without going through the dehumidifier 10. It is supplied (step S403). As a result, the second gas having a larger amount of water than the first gas is supplied to the ozone generator 5.

In this way, when the operation of the ozone generator 5 is started in the state where the second gas is supplied to the ozone generator 5 without being dehumidified (second state) (step S404), the ozone generator 5 starts to drive. Ozone is generated. Therefore, at the start timing of ozone generation in the ozone generator 5, the second gas having a larger water content than the first gas is supplied to the ozone generator 5.

In this example, the generation of ozone in the ozone generator 5 is detected after the start of driving the ozone generator 5 (step S405). The method for detecting the generation of ozone is not particularly limited, but for example, the same configuration as that described with reference to FIG. 3B can be adopted.

When the generation of ozone in the ozone generator 5 is detected (Yes in step S405), the flow path is switched by the switching mechanism 30, so that gas is supplied from the flow path 31 to the ozone generator 5 via the dehumidifier 10. (Step S406). As a result, the second gas is dehumidified and supplied to the ozone generator 5 (first state), and the first gas having a small amount of water is supplied to the ozone generator 5 again. That is, the first gas is supplied to the ozone generator 5 after the start timing of ozone generation in the ozone generator 5.

6. Modification example The switching mechanism 30 is not limited to the configuration including the switching valve 3. For example, the water content of the gas may be changed by switching the first flow path 311 in FIG. 2A to a state in which the first flow path 311 is inserted into the water in the storage portion 41 or a state in which the first flow path 311 is not inserted. Further, the water content of the gas may be changed by switching the insertion portion 313 of the flow path 31 in FIG. 2B to a state in which the insertion portion 313 is inserted into the water in the storage portion 41 or a state in which the insertion portion 313 is not inserted.

The configuration of the humidifier 4 is not limited to the above configuration, and any other configuration can be adopted. Similarly, any configuration can be adopted for the configuration of the dehumidifier 10. For example, the gas supplied to the ozone generator 5 may be humidified or dehumidified by adding or removing water in the ozone generator 5.

However, the configuration is not limited to the provision of the humidifier 4 or the dehumidifier 10, and for example, gases having different water contents (first gas and second gas) are supplied from different gas sources, and these gases are switched by the switching mechanism 30. It may be configured to switch with.

Each step of gas supply during ozone generation, as illustrated in FIGS. 3A, 3B, 5A or 5B, may be at least partially performed manually by the user.

The analyzer is not limited to the total nitrogen meter, and may be another device such as a nitrogen oxide analyzer that measures the concentration of nitrogen oxide (NOx) contained in the sample.

7. Aspects It will be understood by those skilled in the art that the plurality of exemplary embodiments described above are specific examples of the following embodiments.

(Clause 1) The analyzer according to one aspect is
An analyzer for measuring the concentration of nitrogen components contained in a sample.
An ozone generator that generates ozone,
A reaction part that reacts ozone generated from the ozone generator with the nitrogen component in the sample, and
A photodetector that detects the light generated during the reaction in the reaction section,
It may be provided with a switching mechanism capable of switching the gas supplied to the ozone generator to at least one of a first gas and a second gas having a water content higher than that of the first gas.

According to the analyzer according to the first item, the first gas and the second gas having different water contents can be selectively supplied to the ozone generator by the switching mechanism. By switching the gas by the switching mechanism at an appropriate timing, deterioration of parts due to humidity can be suppressed, and the concentration of nitrogen component in the sample can be measured while stably generating ozone.

(Section 2) In the analyzer according to paragraph 1,
A humidifier that produces the second gas by humidifying the first gas is further provided.
The switching mechanism is in a first state in which the first gas is supplied to the ozone generator without being humidified by the humidifier, or the first gas is humidified by the humidifier to the ozone generator. It may be possible to switch to the second state to be supplied.

According to the analyzer according to the second item, the first gas or the second gas having a different water content can be selectively switched and supplied to the ozone generator depending on whether or not the first gas is humidified.

(Section 3) In the analyzer according to paragraph 1,
A dehumidifier that produces the first gas by dehumidifying the second gas is further provided.
The switching mechanism is in a first state in which the second gas is dehumidified by the dehumidifier and supplied to the ozone generator, or the second gas is not dehumidified by the dehumidifier and is supplied to the ozone generator. It may be possible to switch to the second state to be supplied.

According to the analyzer according to the third item, the first gas or the second gas having a different water content can be selectively switched and supplied to the ozone generator depending on whether or not the second gas is dehumidified.

(Clause 4) In the analyzer according to any one of paragraphs 1 to 3.
The switching mechanism may supply the second gas to the ozone generator at the start timing of ozone generation in the ozone generator, and supply the first gas to the ozone generator after the start timing. ..

According to the analyzer described in item 4, at the start timing of ozone generation in the ozone generator, ozone can be stably generated by supplying the ozone generator with a second gas having a large amount of water. .. Further, after the start timing of ozone generation, deterioration of parts can be prevented by supplying the ozone generator with a first gas having a small amount of water.

(Section 5) In the analyzer according to paragraph 4,
Further equipped with a detection unit for detecting the generation of ozone in the ozone generator,
The switching mechanism supplies the second gas to the ozone generator until the detection unit detects the generation of ozone, and after the detection unit detects the generation of ozone, the first gas is supplied to the ozone. It may be supplied to the generator.

According to the analyzer according to the fifth item, ozone can be stably generated by supplying a second gas having a large amount of water to the ozone generator until the generation of ozone is detected. Further, after the generation of ozone is detected, deterioration of the parts can be prevented by supplying the ozone generator with the first gas having a small amount of water.

(Section 6) The analysis method according to one aspect is
It is an analysis method for measuring the concentration of nitrogen component contained in a sample by reacting ozone generated from an ozone generator with a nitrogen component in a sample and detecting the light generated during the reaction with a photodetector. ,
A step of switching the gas supplied to the ozone generator to at least one of a first gas and a second gas having a water content higher than that of the first gas is included.
In the switching step, the second gas may be supplied to the ozone generator at the start timing of ozone generation in the ozone generator, and the first gas may be supplied to the ozone generator after the start timing. ..

According to the analysis method according to the sixth item, the first gas or the second gas having different water contents can be selectively switched and supplied to the ozone generator. If the gas is switched at an appropriate timing, deterioration of parts due to humidity can be suppressed, and the concentration of nitrogen component in the sample can be measured while stably generating ozone. Further, at the start timing of ozone generation in the ozone generator, ozone can be stably generated by supplying the ozone generator with a second gas having a large amount of water. Further, after the start timing of ozone generation, deterioration of parts can be prevented by supplying the ozone generator with a first gas having a small amount of water.

(Section 7) In the analysis method described in Clause 6,
Further comprising the step of producing the second gas by humidifying the first gas.
In the switching step, the first gas is supplied to the ozone generator without being humidified, or the first gas is humidified and supplied to the ozone generator. It may be switched.

According to the analysis method according to the seventh item, the first gas or the second gas having a different water content can be selectively switched and supplied to the ozone generator depending on whether or not the first gas is humidified.

(Section 8) In the analysis method described in Clause 6,
Further comprising the step of producing the first gas by dehumidifying the second gas.
In the switching step, the second gas is dehumidified and supplied to the ozone generator, or the second gas is not dehumidified and is supplied to the ozone generator. It may be switched.

According to the analysis method described in item 8, the first gas or the second gas having a different water content can be selectively switched and supplied to the ozone generator depending on whether or not the second gas is dehumidified.

(Section 9) In the analysis method according to any one of paragraphs 6 to 8,
Further including a step of detecting the generation of ozone in the ozone generator.
In the switching step, the second gas may be supplied to the ozone generator until the generation of ozone is detected, and then the first gas may be supplied to the ozone generator after the generation of ozone is detected. ..

According to the analysis method described in paragraph 9, ozone can be stably generated by supplying a second gas having a large amount of water to the ozone generator until the generation of ozone is detected. Further, after the generation of ozone is detected, deterioration of the parts can be prevented by supplying the ozone generator with the first gas having a small amount of water.

1 Gas source 2 Control valve 3 Switching valve 4 Humidifier 5 Ozone generator 6 Reaction unit 7 Pyrolysis unit 8 Photodetector 9 Control unit 10 Dehumidifier 30 Switching mechanism 31 Flow path 32 Flow path 41 Storage section 51 Electrode 52 AC power supply 71 Combustion pipe 72 Electric furnace 311 1st flow path 312 2nd flow path 313 Insertion part

Claims (9)

An analyzer for measuring the concentration of nitrogen components contained in a sample.
An ozone generator that generates ozone,
A reaction part that reacts ozone generated from the ozone generator with the nitrogen component in the sample, and
A photodetector that detects the light generated during the reaction in the reaction section,
An analyzer comprising a switching mechanism capable of switching the gas supplied to the ozone generator to at least one of a first gas and a second gas having a water content higher than that of the first gas. A humidifier that produces the second gas by humidifying the first gas is further provided.
The switching mechanism is in a first state in which the first gas is supplied to the ozone generator without being humidified by the humidifier, or the first gas is humidified by the humidifier to the ozone generator. The analyzer according to claim 1, which is switchable to a second state of supply. A dehumidifier that produces the first gas by dehumidifying the second gas is further provided.
The switching mechanism is in a first state in which the second gas is dehumidified by the dehumidifier and supplied to the ozone generator, or the second gas is not dehumidified by the dehumidifier and is supplied to the ozone generator. The analyzer according to claim 1, which is switchable to a second state of supply. The switching mechanism claims that the second gas is supplied to the ozone generator at the start timing of ozone generation in the ozone generator, and the first gas is supplied to the ozone generator after the start timing. The analyzer according to any one of 1 to 3. Further equipped with a detection unit for detecting the generation of ozone in the ozone generator,
The switching mechanism supplies the second gas to the ozone generator until the detection unit detects the generation of ozone, and after the detection unit detects the generation of ozone, the first gas is supplied to the ozone. The analyzer according to claim 4, which is supplied to a generator. It is an analysis method for measuring the concentration of nitrogen component contained in a sample by reacting ozone generated from an ozone generator with a nitrogen component in a sample and detecting the light generated during the reaction with a photodetector. ,
A step of switching the gas supplied to the ozone generator to at least one of a first gas and a second gas having a water content higher than that of the first gas is included.
In the switching step, an analysis method in which the second gas is supplied to the ozone generator at the start timing of ozone generation in the ozone generator, and the first gas is supplied to the ozone generator after the start timing. .. Further comprising the step of producing the second gas by humidifying the first gas.
In the switching step, the first gas is supplied to the ozone generator without being humidified, or the first gas is humidified and supplied to the ozone generator. The analysis method according to claim 6, which can be switched. Further comprising the step of producing the first gas by dehumidifying the second gas.
In the switching step, the second gas is dehumidified and supplied to the ozone generator, or the second gas is not dehumidified and is supplied to the ozone generator. The analysis method according to claim 6, which can be switched. Further including a step of detecting the generation of ozone in the ozone generator.
In the switching step, the second gas is supplied to the ozone generator until the generation of ozone is detected, and then the first gas is supplied to the ozone generator after the generation of ozone is detected. The analysis method according to any one of 6 to 8.

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